I make tools for understanding the Java Virtual Machine. Please support my work by sponsoring me on GitHub. Thank you!

JaCoLine - Viewing Historical Command Line #6298

Analysis Date JDK Operating System CPU Architecture Debug JVM?
2022-11-29 OpenJDK17 Linux x86 N
Results
Switches Identified
Switch Analysis
Name Type Description Default Value Your Value
UnlockDiagnosticVMOptions boolean Enable normal processing of flags relating to field diagnostics trueInDebug true
Analysis OK
Name Type Description Default Value Your Value
UnlockExperimentalVMOptions boolean Enable normal processing of flags relating to experimental
features
false true
Analysis OK
Name Type Description Default Value Your Value
OmitStackTraceInFastThrow boolean Omit backtraces for some 'hot' exceptions in optimized code true false
Analysis OK
Name Type Description Default Value Your Value
log <opts> Configure or enable logging with the Java Virtual
Machine (JVM) unified logging framework. Use -Xlog:help
for details.
GC*=debug:file=/data/logs/user/GC%t.log:utctime,level,tags:filecount=50,filesize=100M
Analysis Duplicate switch. This is overridden by -Xlog:safepoint=debug:file=/data/logs/user/safepoint%t.log:utctime,level,tags:filecount=10,filesize=10M.
Name Type Description Default Value Your Value
log <opts> Configure or enable logging with the Java Virtual
Machine (JVM) unified logging framework. Use -Xlog:help
for details.
jit+compilation=info:file=/data/logs/user/jit_compile%t.log:utctime,level,tags:filecount=10,filesize=10M
Analysis Duplicate switch. This is overridden by -Xlog:safepoint=debug:file=/data/logs/user/safepoint%t.log:utctime,level,tags:filecount=10,filesize=10M.
Name Type Description Default Value Your Value
log <opts> Configure or enable logging with the Java Virtual
Machine (JVM) unified logging framework. Use -Xlog:help
for details.
safepoint=debug:file=/data/logs/user/safepoint%t.log:utctime,level,tags:filecount=10,filesize=10M
Analysis OK
Name Type Description Default Value Your Value
MaxDirectMemorySize uint64_t Maximum total size of NIO direct-buffer allocations 0 in range(0, max_jlong) 1024m
Analysis OK
Name Type Description Default Value Your Value
MetaspaceSize size_t Initial threshold (in bytes) at which a garbage collection
is done to reduce Metaspace usage
NOT_LP64(16 * M) LP64_ONLY(21 * M) 384m
Analysis OK
Name Type Description Default Value Your Value
ReservedCodeCacheSize int Reserved code cache size (in bytes) - maximum code cache size
CPUDefault
x8632*M
256m
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
UseZGC boolean Use the Z garbage collector false true
Analysis OK
Name Type Description Default Value Your Value
UseBiasedLocking boolean (Deprecated) Enable biased locking in JVM false false
Analysis This switch will be removed in the future. It will be Deprecated in OpenJDK15. Obsoleted in OpenJDK18. Expired in OpenJDK19.
Name Type Description Default Value Your Value
GuaranteedSafepointInterval int Guarantee a safepoint (at least) every so many milliseconds
(0 means none)
1000 in range(0, max_jint) 0
Analysis OK
Name Type Description Default Value Your Value
UseCountedLoopSafepoints boolean Force counted loops to keep a safepoint false true
Analysis OK
Name Type Description Default Value Your Value
StartFlightRecording string Start flight recording with options NULL disk=true,maxsize=4096m,maxage=3d
Analysis OK
Name Type Description Default Value Your Value
FlightRecorderOptions string Flight Recorder options NULL maxchunksize=128m
Analysis OK
Name Type Description Default Value Your Value
MaxRAMPercentage double Maximum percentage of real memory used for maximum heap size 25.0 in range(0.0, 100.0) 80.0
Analysis Duplicate switch. This is overridden by -XX:MaxRAMPercentage=75.0.
Name Type Description Default Value Your Value
HeapDumpOnOutOfMemoryError boolean Dump heap to file when java.lang.OutOfMemoryError is thrown
from JVM
false true
Analysis OK
Name Type Description Default Value Your Value
HeapDumpPath string When HeapDumpOnOutOfMemoryError is on, the path (filename or
directory) of the dump file (defaults to java_pid<pid>.hprof
in the working directory)
NULL /app/logs/heap.hprof
Analysis OK
Name Type Description Default Value Your Value
MaxRAMPercentage double Maximum percentage of real memory used for maximum heap size 25.0 in range(0.0, 100.0) 75.0
Analysis OK
Name Type Description Default Value Your Value
ms <size> set initial Java heap size 32G
Analysis OK
Name Type Description Default Value Your Value
mx <size> set maximum Java heap size 32G
Analysis OK
Name Type Description Default Value Your Value
ss <size> set java thread stack size 512k
Analysis OK