I’ve recently been taking a look at the new(ish) GRAAL compiler and VM technology which Oracle has been rolling out piece by piece since Java 8. Oracle are clearly very proud of all their work, GRAAL even gets its own proper website, rather than being held captive somewhere in the oracle.com metropolis.

In Java 10 the GRAAL compiler is now available for JIT use, although it’s still considered very experimental (as the required JVM options make clear). But that means it’s probably interesting to play with, even if it’s not something you’d want to trust your live apps with at the moment.

The bulk of this post is basically just a dump of all the available options for the GRAAL JIT compiler in Java 10. The main reason being that I like to see all tweakable options in stuff, as that gives a good idea of how it fits together.

The command I used was…

~/java10/bin$ java -XX:+UnlockExperimentalVMOptions -XX:+EnableJVMCI -XX:+JVMCIPrintProperties

WOW, look at the “beware the leopard” options it requires before allowing you to even print the available options!

Quick aside: “JVMCI” is technically the overall term for the JVM feature that allows you to plug in different JITs in future. It just happens that the first pluggable JIT they’re supporting is GRAAL.

Anyway, now for the big old pile of results from that, with no further commentary in this post. I’ll probably write some more posts on this as I play with the options.

[JVMCI properties]
jvmci.Compiler = null                                                     [String]
          Selects the system compiler. This must match the getCompilerName() value returned by a jdk.vm.ci.runtime.JVMCICompilerFactory provider. An empty string or the value "null" selects a compiler that will raise an exception upon receiving a compilation request.
jvmci.InitTimer = false                                                  [Boolean]
          Specifies if initialization timing is enabled.
jvmci.PrintConfig = false                                                [Boolean]
          Prints VM configuration available via JVMCI.
jvmci.TraceMethodDataFilter = null                                        [String]
          Enables tracing of profiling info when read by JVMCI.
          Empty value: trace all methods
          Non-empty value: trace methods whose fully qualified name contains the value.
jvmci.UseProfilingInformation = true                                     [Boolean]

[Graal properties]
graal.AOTInliningDepthToSizeRate = 2.5                                    [Double]
graal.AOTInliningSizeMaximum = 300                                       [Integer]
graal.AOTInliningSizeMinimum = 50                                        [Integer]
graal.ASMInstructionProfiling = null                                      [String]
          Enables instruction profiling on assembler level. Valid values are a
          comma separated list of supported instructions. Compare with subclasses
          of Assembler.InstructionCounter.
graal.AggregatedMetricsFile = null                                        [String]
          File to which aggregated metrics are dumped at shutdown. A CSV format
          is used if the file ends with .csv otherwise a more human readable
          format is used. If not specified, metrics are dumped to the console.
graal.AlwaysInlineIntrinsics = false                                     [Boolean]
          Unconditionally inline intrinsics
graal.AlwaysInlineVTableStubs = false                                    [Boolean]
graal.BenchmarkCountersDumpDynamic = true                                [Boolean]
          Dump dynamic counters
graal.BenchmarkCountersDumpStatic = false                                [Boolean]
          Dump static counters
graal.BenchmarkCountersFile = null                                        [String]
          File to which benchmark counters are dumped. A CSV format is used if
          the file ends with .csv otherwise a more human readable format is used.
          The fields in the CSV format are: category, group, name, value
graal.BenchmarkDynamicCounters = null                                     [String]
          Turn on the benchmark counters, and listen for specific patterns on
          The format of this option is:

            (err|out),start pattern,end pattern

          You can use "~" to match 1 or more digits.

            err, starting =====, PASSED in
            out,Iteration ~ (~s) begins:,Iteration ~ (~s) ends:

          The first pattern matches DaCapo output and the second matches SPECjvm2008 output.

          As a more detailed example, here are the options to use for getting statistics
          about allocations within the DaCapo pmd benchmark:

            -XX:JVMCICounterSize=<value> -XX:-JVMCICountersExcludeCompiler \
            -Dgraal.BenchmarkDynamicCounters="err, starting ====, PASSED in " \

          The JVMCICounterSize value depends on the granularity of the profiling -
          10000 should be sufficient. Omit JVMCICountersExcludeCompiler to exclude
          counting allocations on the compiler threads.
          The counters can be further configured by the ProfileAllocationsContext option.
graal.BootstrapInitializeOnly = false                                    [Boolean]
          Do not compile anything on bootstrap but just initialize the compiler.
graal.BootstrapTimeout = 15.0                                             [Double]
          Maximum time in minutes to spend bootstrapping (0 to disable this
graal.BootstrapWatchDogCriticalRateRatio = 0.25                           [Double]
          Ratio of the maximum compilation rate below which the bootstrap
          compilation rate must not fall (0 or less disables monitoring).
graal.CallArrayCopy = true                                               [Boolean]
graal.CanOmitFrame = true                                                [Boolean]
graal.CanonicalGraphStringsCheckConstants = false                        [Boolean]
          Exclude virtual nodes when dumping canonical text for graphs.
graal.CanonicalGraphStringsExcludeVirtuals = true                        [Boolean]
          Exclude virtual nodes when dumping canonical text for graphs.
graal.CanonicalGraphStringsRemoveIdentities = true                       [Boolean]
          Attempts to remove object identity hashes when dumping canonical text
          for graphs.
graal.ClearMetricsAfterBootstrap = false                                 [Boolean]
          Clear the debug metrics after bootstrap.
graal.CompilationBailoutAction = Silent                                   [String]
          Specifies the action to take when compilation fails with a bailout
          The accepted values are:
              Silent - Print nothing to the console.
               Print - Print a stack trace to the console.
            Diagnose - Retry the compilation with extra diagnostics.
              ExitVM - Same as Diagnose except that the VM process exits after retrying.
graal.CompilationCountLimit = 0                                          [Integer]
          The number of compilations allowed for any method before the VM exits
          (a value of 0 means there is no limit).
graal.CompilationExpirationPeriod = 300                                  [Integer]
          Time limit in seconds before a compilation expires (0 to disable the
graal.CompilationFailureAction = Diagnose                                 [String]
          Specifies the action to take when compilation fails with a bailout
          exception. The accepted values are the same as for
graal.CompilationWatchDogStackTraceInterval = 60.0                        [Double]
          Interval in seconds between a watch dog reporting stack traces for long
          running compilations.
graal.CompilationWatchDogStartDelay = 0.0                                 [Double]
          Delay in seconds before watch dog monitoring a compilation (0 disables
graal.CompileGraalWithC1Only = true                                      [Boolean]
          In tiered mode compile Graal and JVMCI using optimized first tier code.
graal.CompilerConfiguration = null                                        [String]
          Names the Graal compiler configuration to use. If ommitted, the
          compiler configuration with the highest auto-selection priority is
          used. To see the set of available configurations, supply the value
          'help' to this option.
graal.ConditionalElimination = true                                      [Boolean]
graal.Count = null                                                        [String]
          Pattern for specifying scopes in which counters are enabled. See the
          Dump option for the pattern syntax. An empty value enables all counters
graal.Counters = null                                                     [String]
          Comma separated names of counters that are enabled irrespective of the
          value for Count option. An empty value enables all counters
graal.CrashAt = null                                                      [String]
          Pattern for method(s) that will trigger an exception when compiled.
          This option exists to test handling compilation crashes gracefully. See
          the MethodFilter option for the pattern syntax.
graal.DebugStubsAndSnippets = false                                      [Boolean]
          Enable debug output for stub code generation and snippet preparation.
graal.DeoptALot = false                                                  [Boolean]
graal.DeoptAfterOSR = true                                               [Boolean]
          Deoptimize OSR compiled code when the OSR entry loop is finished if
          there is no mature profile available for the rest of the method.
graal.DeoptsToDisableOptimisticOptimization = 40                         [Integer]
graal.DetailedAsserts = true                                             [Boolean]
          Enable expensive assertions. (Require normal assertions enabled)
graal.Dump = null                                                         [String]
          Filter pattern for specifying scopes in which dumping is enabled.

          A filter is a list of comma-separated terms of the form:


          If <pattern> contains a "*" or "?" character, it is interpreted as a glob pattern.
          Otherwise, it is interpreted as a substring. If <pattern> is empty, it
          matches every scope. If :<level> is omitted, it defaults to 1. The term
          ~<pattern> is a shorthand for <pattern>:0 to disable a debug facility for a pattern.

          The default log level is 0 (disabled). Terms with an empty pattern set
          the default log level to the specified value. The last
          matching term with a non-empty pattern selects the level specified. If
          no term matches, the log level is the default level. A filter with no
          terms matches every scope with a log level of 1.

          Examples of debug filters:
            (empty string)

            Matches any scope with level 1.

            Matches any scope with level 1.

            Matches any scope with level 1.

            Matches scopes containing "CodeGen" or "CodeInstall", both with level 1.

            Matches scopes containing "CodeGen" with level 2, or "CodeInstall" with level 1.

            Matches scopes containing "Outer" with log level 2, or "Inner" with log level 0. If the scope
            name contains both patterns then the log level will be 0. This is useful for silencing subscopes.

            Matches scopes containing "Dead" with level 2, and all other scopes with level 1.

            Matches all scopes with level 1, except those containing "Dead".   Note that the location of
            the :1 doesn't matter since it's specifying the default log level so it's the same as
            specifying :1,Dead:0.

            Matches scopes starting with "Code" with level 1.

            Matches scopes containing "Code" but not "Dead", with level 1.
graal.DumpOnError = false                                                [Boolean]
          Send Graal compiler IR to dump handlers on error.
graal.DumpOnPhaseChange = null                                            [String]
          Dump a before and after graph if the named phase changes the
          graph.%nThe argument is substring matched against the simple name of
          the phase class
graal.DumpPath = "dumps"                                                  [String]
          The directory where various Graal dump files are written.
graal.DumpingErrorsAreFatal = false                                      [Boolean]
          Treat any exceptions during dumping as fatal.
graal.DynamicCountersPrintGroupSeparator = true                          [Boolean]
          Use grouping separators for number printing
graal.EagerSnippets = false                                              [Boolean]
          Eagerly construct extra snippet info.
graal.EscapeAnalysisIterations = 2                                       [Integer]
graal.EscapeAnalysisLoopCutoff = 20                                      [Integer]
graal.EscapeAnalyzeOnly = null                                            [String]
graal.ExactFullUnrollMaxNodes = 1200                                     [Integer]
graal.ExactPartialUnrollMaxNodes = 200                                   [Integer]
graal.ExitVMOnException = false                                          [Boolean]
          Alias for CompilationFailureAction=ExitVM.
graal.FailedLoopExplosionIsFatal = false                                 [Boolean]
          Do not bail out but throw an exception on failed loop explosion.
graal.ForceUseOfNewInstanceStub = false                                  [Boolean]
          Force non-array object allocation to always use the slow path.
graal.FullUnroll = true                                                  [Boolean]
graal.FullUnrollMaxIterations = 600                                      [Integer]
graal.FullUnrollMaxNodes = 300                                           [Integer]
graal.GCDebugStartCycle = -1                                             [Integer]
graal.GenLoopSafepoints = true                                           [Boolean]
graal.GenSafepoints = true                                               [Boolean]
graal.GeneratePIC = false                                                [Boolean]
          Generate position independent code
graal.GenericDynamicCounters = false                                     [Boolean]
          Turn on the benchmark counters, and displays the results on VM shutdown
graal.GraalArithmeticStubs = true                                        [Boolean]
          Use Graal arithmetic stubs instead of HotSpot stubs where possible
graal.GraalCompileOnly = null                                             [String]
          A method filter selecting what should be compiled by Graal. All other
          requests will be reduced to CompilationLevel.Simple.
graal.GraphCompressionThreshold = 70                                     [Integer]
          Graal graph compression is performed when percent of live nodes falls
          below this value
graal.HideSubstitutionStates = false                                     [Boolean]
          When creating info points hide the methods of the substitutions.
graal.HotSpotPrintInlining = false                                       [Boolean]
          Print inlining optimizations
graal.ImmutableCode = false                                              [Boolean]
          Try to avoid emitting code where patching is required
graal.Inline = true                                                      [Boolean]
          Enable inlining
graal.InlineDuringParsing = true                                         [Boolean]
          Inlines trivial methods during bytecode parsing.
graal.InlineDuringParsingMaxDepth = 10                                   [Integer]
          Maximum depth when inlining during bytecode parsing.
graal.InlineEverything = false                                           [Boolean]
graal.InlineIntrinsicsDuringParsing = true                               [Boolean]
          Inlines intrinsic methods during bytecode parsing.
graal.InlineMegamorphicCalls = true                                      [Boolean]
          Inline calls with megamorphic type profile (i.e., not all types could
          be recorded).
graal.InlineMonomorphicCalls = true                                      [Boolean]
          Inline calls with monomorphic type profile.
graal.InlinePartialIntrinsicExitDuringParsing = true                     [Boolean]
          Inlines partial intrinsic exits during bytecode parsing when possible.
          A partial intrinsic exit is a call within an intrinsic to the method
          being intrinsified and denotes semantics of the original method that
          the intrinsic does not support.
graal.InlinePolymorphicCalls = true                                      [Boolean]
          Inline calls with polymorphic type profile.
graal.InlineVTableStubs = true                                           [Boolean]
graal.InliningDepthError = 1000                                          [Integer]
          Maximum inlining depth during partial evaluation before reporting an
          infinite recursion
graal.InterceptBailout = false                                           [Boolean]
          Intercept also bailout exceptions
graal.Intrinsify = true                                                  [Boolean]
          Use compiler intrinsifications.
graal.LIRDynMoveProfileMethod = false                                    [Boolean]
          Enable dynamic move profiling per method.
graal.LIROptConstantLoadOptimization = true                              [Boolean]
          Enable constant load optimization.
graal.LIROptControlFlowOptimizer = true                                  [Boolean]
graal.LIROptEdgeMoveOptimizer = true                                     [Boolean]
graal.LIROptLSRAEliminateSpillMoves = true                               [Boolean]
          Enable spill move elimination.
graal.LIROptLSRAOptimizeSpillPosition = true                             [Boolean]
          Enable spill position optimization
graal.LIROptLSStackSlotAllocator = true                                  [Boolean]
          Use linear scan stack slot allocation.
graal.LIROptNullCheckOptimizer = true                                    [Boolean]
graal.LIROptRedundantMoveElimination = true                              [Boolean]
graal.LIROptStackMoveOptimizer = true                                    [Boolean]
graal.LIROptTraceRAEliminateSpillMoves = true                            [Boolean]
          Enable spill position optimization
graal.LIROptimization = true                                             [Boolean]
          Enable LIR level optimiztations.
graal.LIRProfileMethods = false                                          [Boolean]
          Enables profiling of methods.
graal.LIRProfileMoves = false                                            [Boolean]
          Enables profiling of move types on LIR level. Move types are for
          example stores (register to stack), constant loads (constant to
          register) or copies (register to register).
graal.LIRUnlockBackendRestart = false                                    [Boolean]
          Unlock backend restart feature.
graal.LSRAOptSplitOnly = false                                           [Boolean]
          LSRA optimization: Only split but do not reassign
graal.LSRAOptimization = false                                           [Boolean]
          Enable LSRA optimization
graal.LimitInlinedInvokes = 5.0                                           [Double]
graal.ListMetrics = false                                                [Boolean]
          Lists on the console at VM shutdown the metric names available to the
          Timers, Counters and MemUseTrackers options. Note that this only lists
          the metrics that were initialized during the VM execution and so will
          not include metrics for compiler code that is not executed.
graal.LoadExceptionObjectInVM = false                                    [Boolean]
          Use a VM runtime call to load and clear the exception object from the
          thread at the start of a compiled exception handler.
graal.Log = null                                                          [String]
          Pattern for specifying scopes in which logging is enabled. See the Dump
          option for the pattern syntax.
graal.LogFile = null                                                      [String]
          File to which logging is sent. A %p in the name will be replaced with a
          string identifying the process, usually the process id and %t will be
          replaced by System.currentTimeMillis().
graal.LogVerbose = false                                                 [Boolean]
          Enable more verbose log output when available
graal.LoopMaxUnswitch = 3                                                [Integer]
graal.LoopPeeling = true                                                 [Boolean]
graal.LoopUnswitch = true                                                [Boolean]
graal.LoopUnswitchFrequencyBoost = 10.0                                   [Double]
graal.LoopUnswitchMaxIncrease = 500                                      [Integer]
graal.LoopUnswitchTrivial = 10                                           [Integer]
graal.MatchExpressions = true                                            [Boolean]
          Allow backend to match complex expressions.
graal.MaxCompilationProblemsPerAction = 5                                [Integer]
          The maximum number of compilation failures or bailouts to handle with
          the action specified by CompilationFailureAction or
          CompilationBailoutAction before changing to a less verbose action.
graal.MaxTemplatesPerSnippet = 50                                        [Integer]
graal.MaximumDesiredSize = 20000                                         [Integer]
          Maximum desired size of the compiler graph in nodes.
graal.MaximumEscapeAnalysisArrayLength = 32                              [Integer]
graal.MaximumInliningSize = 300                                          [Integer]
          Inlining is explored up to this number of nodes in the graph for each
          call site.
graal.MaximumLoopExplosionCount = 10000                                  [Integer]
          Max number of loop explosions per method.
graal.MaximumRecursiveInlining = 5                                       [Integer]
          Maximum level of recursive inlining.
graal.MegamorphicInliningMinMethodProbability = 0.33                      [Double]
          Minimum probability for methods to be inlined for megamorphic type
graal.MemUseTrackers = null                                               [String]
          Comma separated names of memory usage trackers that are enabled
          irrespective of the value for TrackMemUse option. An empty value
          enables all memory usage trackers unconditionally.
graal.MethodFilter = null                                                 [String]
          Pattern for filtering debug scope output based on method context.
          The syntax for a pattern is:

            SourcePatterns = SourcePattern ["," SourcePatterns] .
            SourcePattern = [ Class "." ] method [ "(" [ Parameter { ";" Parameter } ] ")" ] .
            Parameter = Class | "int" | "long" | "float" | "double" | "short" | "char" | "boolean" .
            Class = { package "." } class .

          Glob pattern matching (*, ?) is allowed in all parts of the source pattern.

          Examples of method filters:

            Matches all methods named "visit", with the first parameter of
            type "Argument", and the second parameter of type "BlockScope".
            The packages of the parameter types are irrelevant.

            Matches all methods named "arraycopy", with the first parameter
            of type "Object", and four more parameters of any type. The
            packages of the parameter types are irrelevant.

            Matches all methods in the class "org.graalvm.compiler.core.graph.PostOrderNodeIterator".

            Matches all methods in all classes

            Matches all methods named "visit" in classes in the package

            Matches all methods named "arraycopy" or "toString", meaning that ',' acts as an or operator.
graal.MethodFilterRootOnly = false                                       [Boolean]
          Only check MethodFilter against the root method in the context if true,
          otherwise check all methods
graal.MethodInlineBailoutLimit = 5000                                    [Integer]
          Per-compilation method inlining exploration limit before giving up (use
          0 to disable)
graal.MetricsFile = null                                                  [String]
          File to which metrics are dumped per compilation.
          A CSV format is used if the file ends with .csv otherwise a more
          human readable format is used. The fields in the CSV format are:
                     compilable - method being compiled
            compilable_identity - identity hash code of compilable
                 compilation_nr - where this compilation lies in the ordered
                                  sequence of all compilations identified by
                 compilation_id - runtime issued identifier for the compilation
                    metric_name - name of metric
                   metric_value - value of metric
graal.MetricsThreadFilter = null                                          [String]
          Only report metrics for threads whose name matches the regular
graal.MinimumPeelProbability = 0.35                                        [Float]
graal.NDCV = 0                                                           [Integer]
          Run level for NoDeadCodeVerifyHandler (0 = off, 1 = info, 2 = verbose,
          3 = fatal)
graal.NonFatalIdenticalCompilationSnapshots = 20                         [Integer]
          Number of contiguous identical compiler thread stack traces allowed
          before the VM exits on the basis of a stuck compilation.
graal.OmitHotExceptionStacktrace = false                                 [Boolean]
graal.OptAssumptions = true                                              [Boolean]
graal.OptClearNonLiveLocals = true                                       [Boolean]
graal.OptConvertDeoptsToGuards = true                                    [Boolean]
graal.OptDeoptimizationGrouping = true                                   [Boolean]
graal.OptDevirtualizeInvokesOptimistically = true                        [Boolean]
graal.OptEarlyReadElimination = true                                     [Boolean]
graal.OptEliminateGuards = true                                          [Boolean]
graal.OptEliminatePartiallyRedundantGuards = true                        [Boolean]
graal.OptFilterProfiledTypes = true                                      [Boolean]
graal.OptFloatingReads = true                                            [Boolean]
graal.OptImplicitNullChecks = true                                       [Boolean]
graal.OptLoopTransform = true                                            [Boolean]
graal.OptReadElimination = true                                          [Boolean]
graal.OptScheduleOutOfLoops = true                                       [Boolean]
graal.PEAInliningHints = false                                           [Boolean]
graal.PartialEscapeAnalysis = true                                       [Boolean]
graal.PartialUnroll = true                                               [Boolean]
graal.PrintBackendCFG = true                                             [Boolean]
          Enable dumping LIR, register allocation and code generation info to the
graal.PrintBinaryGraphPort = 4445                                        [Integer]
          Port part of the address to which graphs are dumped in binary format
          (ignored if PrintBinaryGraphs=false).
graal.PrintBinaryGraphs = true                                           [Boolean]
          Dump graphs in binary format instead of XML format.
graal.PrintCFG = false                                                   [Boolean]
          Enable dumping to the C1Visualizer. Enabling this option implies
graal.PrintCanonicalGraphStringFlavor = 0                                [Integer]
          Choose format used when dumping canonical text for graphs: 0 gives a
          scheduled graph (better for spotting changes involving the schedule)
          while 1 gives a CFG containing expressions rooted at fixed nodes
          (better for spotting small structure differences)
graal.PrintCanonicalGraphStrings = false                                 [Boolean]
          Enable dumping canonical text from for graphs.
graal.PrintCompilation = false                                           [Boolean]
          Print an informational line to the console for each completed
graal.PrintGraph = true                                                  [Boolean]
          Enable dumping to the IdealGraphVisualizer.
graal.PrintGraphFile = false                                             [Boolean]
          Print graphs to files instead of sending them over the network.
graal.PrintGraphHost = ""                                        [String]
          Host part of the address to which graphs are dumped.
graal.PrintGraphProbabilities = false                                    [Boolean]
          Output probabilities for fixed nodes during binary graph dumping.
graal.PrintGraphWithSchedule = false                                     [Boolean]
          Schedule graphs as they are dumped.
graal.PrintIRWithLIR = false                                             [Boolean]
          Print HIR along side LIR as the latter is generated
graal.PrintIdealGraph = true                                             [Boolean]
          Deprecated - use PrintGraph instead.
graal.PrintIdealGraphAddress = ""                                [String]
          Deprecated - use PrintGraphHost instead.
graal.PrintIdealGraphFile = false                                        [Boolean]
          Deprecated - use PrintGraphFile instead.
graal.PrintIdealGraphPort = 4444                                         [Integer]
          Deprecated - use PrintXmlGraphPort instead.
graal.PrintIdealGraphSchedule = false                                    [Boolean]
          Deprecated - use PrintGraphWithSchedule instead.
graal.PrintLIRWithAssembly = false                                       [Boolean]
          Include the LIR as comments with the final assembly.
graal.PrintProfilingInformation = false                                  [Boolean]
          Print profiling information when parsing a method's bytecode
graal.PrintTruffleTrees = true                                           [Boolean]
          Enable dumping Truffle ASTs to the IdealGraphVisualizer.
graal.PrintXmlGraphPort = 4444                                           [Integer]
          Port part of the address to which graphs are dumped in XML format
          (ignored if PrintBinaryGraphs=true).
graal.ProbabilisticProfiling = true                                      [Boolean]
          Control probabilistic profiling on AMD64
graal.ProfileAllocations = false                                         [Boolean]
          Enable profiling of allocation sites.
graal.ProfileAllocationsContext = AllocatingMethod                        [String]
          Control the naming and granularity of the counters when using
          The accepted values are:
                  AllocatingMethod - a counter per method
                   InstanceOrArray - one counter for all instance allocations and
                                     one counter for all array allocations
                     AllocatedType - one counter per allocated type
            AllocatedTypesInMethod - one counter per allocated type, per method

graal.ProfileBackedges = true                                            [Boolean]
          Emit profiling of backedges
graal.ProfileCompiledMethods = false                                     [Boolean]
graal.ProfileInvokes = true                                              [Boolean]
          Emit profiling of invokes
graal.ProfileMonitors = false                                            [Boolean]
          Enable profiling of monitor operations.
graal.ProfileSimpleMethods = true                                        [Boolean]
          Profile simple methods
graal.RawConditionalElimination = true                                   [Boolean]
graal.ReadEliminationMaxLoopVisits = 5                                   [Integer]
graal.ReassociateInvariants = true                                       [Boolean]
graal.ReduceDCE = true                                                   [Boolean]
          Disable optional dead code eliminations
graal.RegisterPressure = null                                             [String]
          Comma separated list of registers that register allocation is limited
graal.RemoveNeverExecutedCode = true                                     [Boolean]
graal.ReplaceInputsWithConstantsBasedOnStamps = true                     [Boolean]
graal.ResolveClassBeforeStaticInvoke = false                             [Boolean]
graal.ShowDumpFiles = false                                              [Boolean]
          Print the name of each dump file path as it's created.
graal.SimpleFastInflatedLocking = true                                   [Boolean]
          Handle simple cases for inflated monitors in the fast-path.
graal.SimpleMethodCalls = 1                                              [Integer]
          Maximum number of calls in a simple method
graal.SimpleMethodGraphSize = 256                                        [Integer]
          Maximum number of nodes in a graph for a simple method
graal.SimpleMethodIndirectCalls = 0                                      [Integer]
          Maximum number of indirect calls in a simple moethod
graal.SmallCompiledLowLevelGraphSize = 300                               [Integer]
          If the previous low-level graph size of the method exceeds the
          threshold, it is not inlined.
graal.SnippetCounters = false                                            [Boolean]
          Enable counters for various paths in snippets.
graal.StressExplicitExceptionCode = false                                [Boolean]
          Stress the code emitting explicit exception throwing code.
graal.StressInvokeWithExceptionNode = false                              [Boolean]
          Stress the code emitting invokes with explicit exception edges.
graal.StressTestEarlyReads = false                                       [Boolean]
          Stress the code by emitting reads at earliest instead of latest point.
graal.SupportJsrBytecodes = true                                         [Boolean]
graal.SupportOSRWithLocks = true                                         [Boolean]
          Support OSR compilations with locks. If DeoptAfterOSR is true we can
          per definition not have unbalaced enter/extis mappings. If
          DeoptAfterOSR is false insert artificial monitor enters after the
          OSRStart to have balanced enter/exits in the graph.
graal.TailDuplicationProbability = 0.5                                    [Double]
graal.TailDuplicationTrivialSize = 1                                     [Integer]
graal.TierABackedgeNotifyFreqLog = 16                                    [Integer]
          Backedge notification frequency
graal.TierABackedgeProfileProbabilityLog = 12                            [Integer]
          Backedge profile probability
graal.TierAInvokeInlineeNotifyFreqLog = -1                               [Integer]
          Inlinee invocation notification frequency (-1 means count, but do not
graal.TierAInvokeNotifyFreqLog = 13                                      [Integer]
          Invocation notification frequency
graal.TierAInvokeProfileProbabilityLog = 8                               [Integer]
          Invocation profile probability
graal.TieredAOT = false                                                  [Boolean]
          Do profiling and callbacks to tiered runtime
graal.Time = null                                                         [String]
          Pattern for specifying scopes in which timing is enabled. See the Dump
          option for the pattern syntax. An empty value enables all timers
graal.TimedDynamicCounters = -1                                          [Integer]
          Turn on the benchmark counters, and displays the results every n
graal.Timers = null                                                       [String]
          Comma separated names of timers that are enabled irrespective of the
          value for Time option. An empty value enables all timers
graal.TraceBuilding = UniDirectional                                      [String]
          Trace building algorithm.
graal.TraceBytecodeParserLevel = 0                                       [Integer]
          The trace level for the bytecode parser used when building a graph from
graal.TraceEscapeAnalysis = false                                        [Boolean]
graal.TraceExceptionHandlerStub = false                                  [Boolean]
          Trace execution of stub used to handle an exception thrown by a callee.
graal.TraceInlineDuringParsing = false                                   [Boolean]
          Traces inlining performed during bytecode parsing.
graal.TraceLIRGeneratorLevel = 0                                         [Integer]
          The trace level for the LIR generator
graal.TraceMonitorsMethodFilter = null                                    [String]
          Trace monitor operations in methods whose fully qualified name contains
          this substring.
graal.TraceMonitorsTypeFilter = null                                      [String]
          Trace monitor operations on objects whose type contains this substring.
graal.TraceNewArrayStub = false                                          [Boolean]
          Trace execution of slow path stub for array allocation.
graal.TraceNewInstanceStub = false                                       [Boolean]
          Trace execution of slow path stub for non-array object allocation.
graal.TraceParserPlugins = false                                         [Boolean]
          Traces use of plugins during bytecode parsing.
graal.TraceRA = false                                                    [Boolean]
          Enable experimental Trace Register Allocation.
graal.TraceRACacheStackSlots = true                                      [Boolean]
          Cache stack slots globally (i.e. a variable always gets the same slot
          in every trace).
graal.TraceRAPolicy = Default                                             [String]
          TraceRA allocation policy to use.
graal.TraceRAScheduleTrivialTracesEarly = true                           [Boolean]
          Schedule trivial traces as early as possible.
graal.TraceRAalmostTrivialSize = 2                                       [Integer]
          Use BottomUp if there is only one block with at most this number of
graal.TraceRAbottomUpRatio = 0.0                                          [Double]
          Use LSRA / BottomUp ratio
graal.TraceRAnumVariables = null                                         [Integer]
          Use BottomUp for traces with low number of variables at block
graal.TraceRAprobalilityThreshold = 0.8                                   [Double]
          Probability Threshold
graal.TraceRAreuseStackSlotsForMoveResolutionCycleBreaking = true        [Boolean]
          Reuse spill slots for global move resolution cycle breaking.
graal.TraceRAshareSpillInformation = true                                [Boolean]
          Share information about spilled values to other traces.
graal.TraceRAsumBudget = 0.5                                              [Double]
          Sum Probability Budget Threshold
graal.TraceRAtrivialBlockAllocator = true                                [Boolean]
          Use special allocator for trivial blocks.
graal.TraceRAuseInterTraceHints = true                                   [Boolean]
          Use inter-trace register hints.
graal.TraceUnwindStub = false                                            [Boolean]
          Trace execution of the stub that routes an exception to a handler in
          the calling frame.
graal.TrackMemUse = null                                                  [String]
          Pattern for specifying scopes in which memory use tracking is enabled.
          See the Dump option for the pattern syntax. An empty value enables all
          memory use trackers unconditionally.
graal.TrivialInliningSize = 10                                           [Integer]
          Graphs with less than this number of nodes are trivial and therefore
          always inlined.
graal.TrustFinalDefaultFields = true                                     [Boolean]
          Determines whether to treat final fields with default values as
graal.TypeCheckMaxHints = 2                                              [Integer]
          The maximum number of profiled types that will be used when compiling a
          profiled type check. Note that TypeCheckMinProfileHitProbability also
          influences whether profiling info is used in compiled type checks.
graal.TypeCheckMinProfileHitProbability = 0.5                             [Double]
          If the probability that a type check will hit one the profiled types
          (up to TypeCheckMaxHints) is below this value, the type check will be
          compiled without profiling info
graal.UnrollMaxIterations = 16                                           [Integer]
graal.UseCompilationStatistics = false                                   [Boolean]
          Enables CompilationStatistics.
graal.UseExceptionProbability = true                                     [Boolean]
graal.UseGuardedIntrinsics = true                                        [Boolean]
          Use intrinsics guarded by a virtual dispatch test at indirect call
graal.UseLoopLimitChecks = true                                          [Boolean]
graal.UseSnippetGraphCache = true                                        [Boolean]
          Use a cache for snippet graphs.
graal.UseSnippetTemplateCache = true                                     [Boolean]
          Use a LRU cache for snippet templates.
graal.UseTypeCheckHints = true                                           [Boolean]
graal.Verify = null                                                       [String]
          Pattern for specifying scopes in which logging is enabled. See the Dump
          option for the pattern syntax.
graal.VerifyBalancedMonitors = false                                     [Boolean]
          Emit extra code to dynamically check monitor operations are balanced.
graal.VerifyGraalGraphEdges = false                                      [Boolean]
          Perform expensive verification of graph inputs, usages, successors and
graal.VerifyGraalGraphs = true                                           [Boolean]
          Verify graphs often during compilation when assertions are turned on
graal.VerifyGraalPhasesSize = false                                      [Boolean]
          Verify before - after relation of the relative, computed, code size of
          a graph
graal.VerifyHeapAtReturn = false                                         [Boolean]
          Perform platform dependent validation of the Java heap at returns
graal.VerifyKillCFGUnusedNodes = false                                   [Boolean]
          Verify that there are no new unused nodes when performing killCFG
graal.VerifyPhases = false                                               [Boolean]
graal.ZapStackOnMethodEntry = false                                      [Boolean]