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java9 gc log參數(shù)遷移

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摘要：序本文主要研究一下參數(shù)的遷移。比如實(shí)例為，為，文件數(shù)為，每個(gè)文件，文件名為，為和輸出實(shí)例遷移舊版相關(guān)參數(shù)遷移舊版運(yùn)行時(shí)參數(shù)遷移小結(jié)把的配置統(tǒng)一到了中，可以按照官方給出的新舊參數(shù)映射表進(jìn)行遷移。

序

本文主要研究一下java9 gc log參數(shù)的遷移。

統(tǒng)一JVM及GC的Logging

java9引進(jìn)了一個(gè)統(tǒng)一的日志框架，對(duì)gc log的輸出進(jìn)行了統(tǒng)一的配置。

相關(guān)JEP(JDK Enhancement Proposal)

JEP 158: Unified JVM Logging

JEP 264: Platform Logging API and Service

JEP 271: Unified GC Logging

Xlog語法 
-Xlog[:option]
    option         :=  [][:[][:[][:]]]
                       "help"
                       "disable"
    what           :=  [,...]
    selector       :=  [*][=]
    tag-set        :=  [+...]
                       "all"
    tag            :=  name of tag
    level          :=  trace
                       debug
                       info
                       warning
                       error
    output         :=  "stderr"
                       "stdout"
                       [file=]
    decorators     :=  [,...]
                       "none"
    decorator      :=  time
                       uptime
                       timemillis
                       uptimemillis
                       timenanos
                       uptimenanos
                       pid
                       tid
                       level
                       tags
    output-options :=  [,...]
    output-option  :=  filecount=
                       filesize=
                       parameter=value
what 
主要是配置tag及l(fā)evel
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)`)
有如上三種，其中指定file的話，可以使用%p變量表示當(dāng)前jvm的pid，用%t表示jvm的啟動(dòng)時(shí)間戳。比如
-Xlog:gc:demoapp-gc-%p-%t.log

輸出的文件名如下：

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

不指定的話，默認(rèn)是uptime, level, and tags這三個(gè)。比如
[3.080s][info][gc,cpu        ] GC(5) User=0.03s Sys=0.00s Real=0.01s
實(shí)例 
-Xlog:gc=trace:file=gctrace.txt:uptimemillis,pid:filecount=5,filesize=1024
tag為gc，levle為trace，rotate文件數(shù)為5，每個(gè)文件1M，文件名為gctrace.txt，decrotators為uptimemillis和pid

輸出實(shí)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
遷移 舊版GC相關(guān)參數(shù)遷移
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.
舊版運(yùn)行時(shí)參數(shù)遷移
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.
小結(jié)

java9把gc log的配置統(tǒng)一到了Xlog中，可以按照官方給出的新舊參數(shù)映射表進(jìn)行遷移。

doc

Enable Logging with the JVM Unified Logging Framework

-Xlog Output

Convert GC Logging Flags to Xlog

Convert Runtime Logging Flags to Xlog

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