JaCoLine - Viewing Historical Command Line #6244

Analysis Date	JDK	Operating System	CPU Architecture	Debug JVM?
2022-11-24	OpenJDK17	Windows	- Any -	Y

Results

Switches Identified

-Xmx4G

-Xms4G

-XX:+EnableJVMCI

-XX:+UseJVMCICompiler

-XX:+EagerJVMCI

-XX:+AlwaysPreTouch

-XX:+PerfDisableSharedMem

-XX:-UsePerfData

-XX:+AggressiveHeap

-XX:+UseLargePages

-XX:LargePageSizeInBytes=2M

-XX:+UseShenandoahGC

-XX:ShenandoahGuaranteedGCInterval=1000000

-XX:+DisableExplicitGC

-XX:NmethodSweepActivity=1

-XX:ReservedCodeCacheSize=400M

-XX:NonNMethodCodeHeapSize=12M

-XX:ProfiledCodeHeapSize=194M

-XX:NonProfiledCodeHeapSize=194M

-XX:-DontCompileHugeMethods

-XX:MaxNodeLimit=240000

-XX:NodeLimitFudgeFactor=8000

-XX:+UseVectorCmov

-XX:+UseFastUnorderedTimeStamps

-XX:+UseCriticalJavaThreadPriority

-XX:ThreadPriorityPolicy=1

Switch Analysis

Name	Type	Description	Default Value	Your Value
mx	<size>	set maximum Java heap size		4G
Analysis	OK

Name	Type	Description	Default Value	Your Value
ms	<size>	set initial Java heap size		4G
Analysis	OK

Name	Type	Description	Default Value	Your Value
EnableJVMCI	boolean	Enable JVMCI	false	true
Analysis	OK

Name	Type	Description	Default Value	Your Value
UseJVMCICompiler	boolean	Use JVMCI as the default compiler. Defaults to true if EnableJVMCIProduct is true.	false	true
Analysis	OK

Name	Type	Description	Default Value	Your Value
EagerJVMCI	boolean	Force eager JVMCI initialization	false	true
Analysis	OK

Name	Type	Description	Default Value	Your Value
AlwaysPreTouch	boolean	Force all freshly committed pages to be pre-touched	false	true
Analysis	OK

Name	Type	Description	Default Value	Your Value
PerfDisableSharedMem	boolean	Store performance data in standard memory	false	true
Analysis	OK

Name	Type	Description	Default Value	Your Value
UsePerfData	boolean	Flag to disable jvmstat instrumentation for performance testing and problem isolation purposes	true	false
Analysis	OK

Name	Type	Description	Default Value	Your Value
AggressiveHeap	boolean	Optimize heap options for long-running memory intensive apps	false	true
Analysis	OK

Name	Type	Description	Default Value	Your Value
UseLargePages	boolean	Use large page memory	false	true
Analysis	OK

Name	Type	Description	Default Value	Your Value
LargePageSizeInBytes	size_t	Maximum large page size used (0 will use the default large page size for the environment as the maximum)	0 in range(0, max_uintx)	2M
Analysis	OK

Name	Type	Description	Default Value	Your Value
UseShenandoahGC	boolean	Use the Shenandoah garbage collector	false	true
Analysis	OK

Name	Type	Description	Default Value	Your Value
ShenandoahGuaranteedGCInterval	int	Many heuristics would guarantee a concurrent GC cycle at least with this interval. This is useful when large idle intervals are present, where GC can run without stealing time from active application. Time is in milliseconds. Setting this to 0 disables the feature.	5601000	1000000
Analysis	OK

Name	Type	Description	Default Value	Your Value
DisableExplicitGC	boolean	Ignore calls to System.gc()	false	true
Analysis	OK

Name	Type	Description	Default Value	Your Value
NmethodSweepActivity	int	Removes cold nmethods from code cache if > 0. Higher values result in more aggressive sweeping	10 in range(0, 2000)	1
Analysis	OK

Name

Type

Description

Default Value

Your Value

ReservedCodeCacheSize

int

Reserved code cache size (in bytes) - maximum code cache size

CPU	Default
aarch64	32*M
arm	32*M
ppc	32*M
riscv	48*M
s390	48*M
x86	32*M

400M

Analysis

Name

Type

Description

Default Value

Your Value

NonNMethodCodeHeapSize

int

Size of code heap with non-nmethods (in bytes)

CPU	Default
aarch64	5*M
arm	5*M
ppc	5*M
riscv	5*M
s390	5*M
x86	5*M

12M

Analysis

Name

Type

Description

Default Value

Your Value

ProfiledCodeHeapSize

int

Size of code heap with profiled methods (in bytes)

CPU	Default
aarch64	14*M
arm	14*M
ppc	14*M
riscv	22*M
s390	22*M
x86	14*M

194M

Analysis

Name

Type

Description

Default Value

Your Value

NonProfiledCodeHeapSize

int

Size of code heap with non-profiled methods (in bytes)

CPU	Default
aarch64	13*M
arm	13*M
ppc	13*M
riscv	21*M
s390	21*M
x86	13*M

194M

Analysis

Name	Type	Description	Default Value	Your Value
DontCompileHugeMethods	boolean	Do not compile methods > HugeMethodLimit	true	false
Analysis	OK

Name	Type	Description	Default Value	Your Value
MaxNodeLimit	int	Maximum number of nodes	80000 in range(1000, max_jint / 3)	240000
Analysis	OK

Name	Type	Description	Default Value	Your Value
NodeLimitFudgeFactor	int	Fudge Factor for certain optimizations	2000	8000
Analysis	OK

Name	Type	Description	Default Value	Your Value
UseVectorCmov	boolean	Use Vectorized Cmov	false	true
Analysis	OK

Name	Type	Description	Default Value	Your Value
UseFastUnorderedTimeStamps	boolean	Use platform unstable time where supported for timestamps only	false	true
Analysis	OK

Name	Type	Description	Default Value	Your Value
UseCriticalJavaThreadPriority	boolean	Java thread priority 10 maps to critical scheduling priority	false	true
Analysis	OK

Name	Type	Description	Default Value	Your Value
ThreadPriorityPolicy	int	0 : Normal. VM chooses priorities that are appropriate for normal applications. On Windows applications are allowed to use higher native priorities. However, with ThreadPriorityPolicy=0, VM will not use the highest possible native priority, THREAD_PRIORITY_TIME_CRITICAL, as it may interfere with system threads. On Linux thread priorities are ignored because the OS does not support static priority in SCHED_OTHER scheduling class which is the only choice for non-root, non-realtime applications. 1 : Aggressive. Java thread priorities map over to the entire range of native thread priorities. Higher Java thread priorities map to higher native thread priorities. This policy should be used with care, as sometimes it can cause performance degradation in the application and/or the entire system. On Linux/BSD/macOS this policy requires root privilege or an extended capability.	0 in range(0, 1)	1
Analysis	OK