序
本文主要研究一下java9 gc log参数的迁移。
统一JVM及GC的Logging
java9引进了一个统一的日志框架,对gc log的输出进行了统一的配置。
相关JEP(JDK Enhancement Proposal
)
Xlog语法
-Xlog[:option]
option := [<what>][:[<output>][:[<decorators>][:<output-options>]]]
'help'
'disable'
what := <selector>[,...]
selector := <tag-set>[*][=<level>]
tag-set := <tag>[+...]
'all'
tag := name of tag
level := trace
debug
info
warning
error
output := 'stderr'
'stdout'
[file=]<filename>
decorators := <decorator>[,...]
'none'
decorator := time
uptime
timemillis
uptimemillis
timenanos
uptimenanos
pid
tid
level
tags
output-options := <output_option>[,...]
output-option := filecount=<file count>
filesize=<file size in kb>
parameter=value
what
主要是配置tag及level
tag
其中all代表所有的tag,其他的如下:
add,age,alloc,annotation,aot,arguments,attach,barrier,biasedlocking,blocks,bot,breakpoint,bytecode,census,class,classhisto,cleanup,compaction,comparator,constraints,constantpool,coops,cpu,cset,data,defaultmethods,dump,ergo,event,exceptions,exit,fingerprint,freelist,gc,hashtables,heap,humongous,ihop,iklass,init,itables,jfr,jni,jvmti,liveness,load,loader,logging,mark,marking,metadata,metaspace,method,mmu,modules,monitorinflation,monitormismatch,nmethod,normalize,objecttagging,obsolete,oopmap,os,pagesize,parser,patch,path,phases,plab,preorder,promotion,protectiondomain,purge,redefine,ref,refine,region,remset,resolve,safepoint,scavenge,scrub,setting,stackmap,stacktrace,stackwalk,start,startuptime,state,stats,stringdedup,stringtable,subclass,survivor,sweep,system,task,thread,time,timer,tlab,unload,update,verification,verify,vmoperation,vtables,workgang
level
主要分off,trace,debug,info,warning,error
output
- stdout(`Sends output to stdout`)
- stderr(`Sends output to stderr`)
- file=filename(`Sends output to text file(s)`)
有如上三种,其中指定file的话,可以使用%p变量表示当前jvm的pid,用%t表示jvm的启动时间戳。比如
-Xlog:gc:demoapp-gc-%p-%t.log
输出的文件名如下:
demoapp-gc-1678-2018-03-01_21-44-18.log
decorators
- time -- Current time and date in ISO-8601 format
- uptime -- Time since the start of the JVM in seconds and milliseconds (e.g., 6.567s)
- timemillis -- The same value as generated by System.currentTimeMillis()
- uptimemillis -- Milliseconds since the JVM started
- timenanos -- The same value as generated by System.nanoTime()
- uptimenanos -- Nanoseconds since the JVM started
- pid -- The process identifier
- tid -- The thread identifier
- level -- The level associated with the log message
- tags -- The tag-set associated with the log message
不指定的话,默认是uptime, level, and tags这三个。比如
[3.080s][info][gc,cpu ] GC(5) User=0.03s Sys=0.00s Real=0.01s
实例
-Xlog:gc=trace:file=gctrace.txt:uptimemillis,pid:filecount=5,filesize=1024
tag为gc,levle为trace,rotate文件数为5,每个文件1M,文件名为gctrace.txt,decrotators为uptimemillis和pid
输出实例
[1110ms][1867] GC(2) Pause Remark 17M->17M(256M) 2.024ms
[1110ms][1867] GC(2) Finalize Live Data 0.000ms
[1110ms][1867] GC(2) Pause Cleanup 17M->17M(256M) 0.177ms
[1112ms][1867] GC(2) Concurrent Cycle 7.470ms
[2951ms][1867] GC(3) Pause Initial Mark (Metadata GC Threshold) 149M->30M(256M) 27.175ms
[2951ms][1867] GC(4) Concurrent Cycle
[2972ms][1867] GC(4) Pause Remark 32M->32M(256M) 5.132ms
[2974ms][1867] GC(4) Finalize Live Data 0.000ms
[2974ms][1867] GC(4) Pause Cleanup 32M->32M(256M) 0.214ms
[2976ms][1867] GC(4) Concurrent Cycle 25.422ms
迁移
旧版GC相关参数迁移
Legacy Garbage Collection (GC) Flag | Xlog Configuration | Comment |
---|---|---|
G1PrintHeapRegions | -Xlog:gc+region=trace | Not Applicable |
GCLogFileSize | No configuration available | Log rotation is handled by the framework. |
NumberOfGCLogFiles | Not Applicable | Log rotation is handled by the framework. |
PrintAdaptiveSizePolicy | -Xlog:ergo*=level | Use a level of debug for most of the information, or a level of trace for all of what was logged for PrintAdaptiveSizePolicy. |
PrintGC | -Xlog:gc | Not Applicable |
PrintGCApplicationConcurrentTime | -Xlog:safepoint | Note that PrintGCApplicationConcurrentTime and PrintGCApplicationStoppedTime are logged on the same tag and aren’t separated in the new logging. |
PrintGCApplicationStoppedTime | -Xlog:safepoint | Note that PrintGCApplicationConcurrentTime and PrintGCApplicationStoppedTime are logged on the same tag and not separated in the new logging. |
PrintGCCause | Not Applicable | GC cause is now always logged. |
PrintGCDateStamps | Not Applicable | Date stamps are logged by the framework. |
PrintGCDetails | -Xlog:gc* | Not Applicable |
PrintGCID | Not Applicable | GC ID is now always logged. |
PrintGCTaskTimeStamps | -Xlog:task*=debug | Not Applicable |
PrintGCTimeStamps | Not Applicable | Time stamps are logged by the framework. |
PrintHeapAtGC | -Xlog:gc+heap=trace | Not Applicable |
PrintReferenceGC | -Xlog:ref*=debug | Note that in the old logging, PrintReferenceGC had an effect only if PrintGCDetails was also enabled. |
PrintStringDeduplicationStatistics | -Xlog:stringdedup*=debug | Not Applicable |
PrintTenuringDistribution | -Xlog:age*=level | Use a level of debug for the most relevant information, or a level of trace for all of what was logged for PrintTenuringDistribution. |
UseGCLogFileRotation | Not Applicable | What was logged for PrintTenuringDistribution. |
旧版运行时参数迁移
Legacy Runtime Flag | Xlog Configuration | Comment |
---|---|---|
TraceExceptions | -Xlog:exceptions=info | Not Applicable |
TraceClassLoading | -Xlog:class+load=level | Use level=info for regular information, or level=debug for additional information. In Unified Logging syntax, -verbose:class equals -Xlog:class+load=info,class+unload=info. |
TraceClassLoadingPreorder | -Xlog:class+preorder=debug | Not Applicable |
TraceClassUnloading | -Xlog:class+unload=level | Use level=info for regular information, or level=trace for additional information. In Unified Logging syntax, -verbose:class equals -Xlog:class+load=info,class+unload=info. |
VerboseVerification | -Xlog:verification=info | Not Applicable |
TraceClassPaths | -Xlog:class+path=info | Not Applicable |
TraceClassResolution | -Xlog:class+resolve=debug | Not Applicable |
TraceClassInitialization | -Xlog:class+init=info | Not Applicable |
TraceLoaderConstraints | -Xlog:class+loader+constraints=info | Not Applicable |
TraceClassLoaderData | -Xlog:class+loader+data=level | Use level=debug for regular information or level=trace for additional information. |
TraceSafepointCleanupTime | -Xlog:safepoint+cleanup=info | Not Applicable |
TraceSafepoint | -Xlog:safepoint=debug | Not Applicable |
TraceMonitorInflation | -Xlog:monitorinflation=debug | Not Applicable |
TraceBiasedLocking | -Xlog:biasedlocking=level | Use level=info for regular information, or level=trace for additional information. |
TraceRedefineClasses | -Xlog:redefine+class*=level | level=info, =debug, and =trace provide increasing amounts of information. |
小结
java9把gc log的配置统一到了Xlog中,可以按照官方给出的新旧参数映射表进行迁移。
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