JVM的分析工具
1、簡介
| 名稱 | 功能 | 經常使用命令 |
|---|---|---|
| jps | 顯示java程序 | jps -l |
| jinfo | 顯示java進程信息：pid、system Properties 及 arg[] | jinfo pid |
| jconsole | ||
| jstat | java實時監控工具:通常用來調優（gc） | jstat -gc pid 間隔 次數 |
| jstack | java實時監控工具:打印棧信息,通常用來調優、線程運行狀況（鎖） | jstack -l pid |
| jmap | 是打印堆內存信息，通常都是找BUG，如：死鎖、對象大小等等，將數據存放下來，而後在本分析 | jmap -histo pid > 1.txt/jmap -dump:format=b,file=1.bin pid |
jmap、jstatck和jstat的區別是
- jmap:是打印堆內存信息，通常都是找BUG，如：死鎖、對象大小等等，將數據存放下來，而後在本分析。
- jstack：獲取JVM中線程的信息，用於查找性能點，死鎖等。
- jstat:打印gc、class、compiler的實時信息，通常用來調優
2、jps [host]
列出主機上的進程(-v列出具體的信息)
[root@1 tomcat]# jps -v 13781 Jps -Denv.class.path=/usr/local/jdk1.7.0_79/lib:/usr/local/jdk1.7.0_79/jre/lib -Dapplication.home=/usr/local/jdk1.7.0_79 -Xms8m 17541 -- process information unavailable 14661 -- process information unavailable 12224 -- process information unavailable 26343 Bootstrap -Djava.util.logging.config.file=/data/project/dlmall_tomcat_8080/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djdk.tls.ephemeralDHKeySize=2048 -Djava.endorsed.dirs=/data/project/dlmall_tomcat_8080/endorsed -Dcatalina.base=/data/project/dlmall_tomcat_8080 -Dcatalina.home=/data/project/dlmall_tomcat_8080 -Djava.io.tmpdir=/data/project/dlmall_tomcat_8080/temp 28134 -- process information unavailable 8167 -- process information unavailable 19265 -- process information unavailable 14703 -- process information unavailable 13482 -- process information unavailable 15683 -- process information unavailable 1742 Bootstrap -Djava.util.logging.config.file=/data/project/dlmall_tomcat_8080/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djdk.tls.ephemeralDHKeySize=2048 -Djava.endorsed.dirs=/data/project/dlmall_tomcat_8080/endorsed -Dcatalina.base=/data/project/dlmall_tomcat_8080 -Dcatalina.home=/data/project/dlmall_tomcat_8080 -Djava.io.tmpdir=/data/project/dlmall_tomcat_8080/temp 1300 Bootstrap -Djava.util.logging.config.file=/data/project/usercenter_tomcat_10224/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -Djdk.tls.ephemeralDHKeySize=2048 -Djava.endorsed.dirs=/data/project/usercenter_tomcat_10224/endorsed -Dcatalina.base=/data/project/usercenter_tomcat_10224 -Dcatalina.home=/data/project/usercenter_tomcat_10224 -Djava.io.tmpdir=/data/project/usercenter_tomcat_10224/temp 9356 -- process information unavailable 14781 -- process information unavailable 15357 -- process information unavailable 15019 -- process information unavailable 16988 -- process information unavailable 6308 -- process information unavailable
3、jinfo 輸出java進程的信息
[root@1 tomcat]# jinfo 15357
Attaching to process ID 15357, please wait...
Debugger attached successfully.
Server compiler detected.
JVM version is 24.79-b02
Java System Properties:
java.runtime.name = Java(TM) SE Runtime Environment
java.vm.version = 24.79-b02
sun.boot.library.path = /usr/local/jdk1.7.0_79/jre/lib/amd64
shared.loader =
java.vendor.url = http://java.oracle.com/
java.vm.vendor = Oracle Corporation
path.separator = :
file.encoding.pkg = sun.io
java.vm.name = Java HotSpot(TM) 64-Bit Server VM
java.util.logging.config.file = /data/project/dlpublic_tomcat_10216/conf/logging.properties
tomcat.util.buf.StringCache.byte.enabled = true
sun.os.patch.level = unknown
sun.java.launcher = SUN_STANDARD
user.country = US
user.dir = /data/project
java.vm.specification.name = Java Virtual Machine Specification
java.runtime.version = 1.7.0_79-b15
org.apache.catalina.startup.TldConfig.jarsToSkip = tomcat7-websocket.jar
java.awt.graphicsenv = sun.awt.X11GraphicsEnvironment
os.arch = amd64
java.endorsed.dirs = /data/project/dlpublic_tomcat_10216/endorsed
line.separator =
java.io.tmpdir = /data/project/dlpublic_tomcat_10216/temp
java.vm.specification.vendor = Oracle Corporation
java.util.logging.manager = org.apache.juli.ClassLoaderLogManager
java.naming.factory.url.pkgs = org.apache.naming
os.name = Linux
sun.jnu.encoding = UTF-8
java.library.path = /usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib
tomcat.util.scan.DefaultJarScanner.jarsToSkip = bootstrap.jar,commons-daemon.jar,tomcat-juli.jar,annotations-api.jar,el-api.jar,jsp-api.jar,servlet-api.jar,websocket-api.jar,catalina.jar,catalina-ant.jar,catalina-ha.jar,catalina-tribes.jar,jasper.jar,jasper-el.jar,ecj-*.jar,tomcat-api.jar,tomcat-util.jar,tomcat-coyote.jar,tomcat-dbcp.jar,tomcat-jni.jar,tomcat-spdy.jar,tomcat-i18n-en.jar,tomcat-i18n-es.jar,tomcat-i18n-fr.jar,tomcat-i18n-ja.jar,tomcat-juli-adapters.jar,catalina-jmx-remote.jar,catalina-ws.jar,tomcat-jdbc.jar,tools.jar,commons-beanutils*.jar,commons-codec*.jar,commons-collections*.jar,commons-dbcp*.jar,commons-digester*.jar,commons-fileupload*.jar,commons-httpclient*.jar,commons-io*.jar,commons-lang*.jar,commons-logging*.jar,commons-math*.jar,commons-pool*.jar,jstl.jar,taglibs-standard-spec-*.jar,geronimo-spec-jaxrpc*.jar,wsdl4j*.jar,ant.jar,ant-junit*.jar,aspectj*.jar,jmx.jar,h2*.jar,hibernate*.jar,httpclient*.jar,jmx-tools.jar,jta*.jar,log4j.jar,log4j-1*.jar,mail*.jar,slf4j*.jar,xercesImpl.jar,xmlParserAPIs.jar,xml-apis.jar,junit.jar,junit-*.jar,hamcrest*.jar,org.hamcrest*.jar,ant-launcher.jar,cobertura-*.jar,asm-*.jar,dom4j-*.jar,icu4j-*.jar,jaxen-*.jar,jdom-*.jar,jetty-*.jar,oro-*.jar,servlet-api-*.jar,tagsoup-*.jar,xmlParserAPIs-*.jar,xom-*.jar
java.class.version = 51.0
java.specification.name = Java Platform API Specification
sun.management.compiler = HotSpot 64-Bit Tiered Compilers
os.version = 3.10.0-229.el7.x86_64
user.home = /home/tomcat
org.apache.catalina.startup.ContextConfig.jarsToSkip =
user.timezone = Asia/Chungking
catalina.useNaming = true
java.awt.printerjob = sun.print.PSPrinterJob
file.encoding = UTF-8
java.specification.version = 1.7
catalina.home = /data/project/dlpublic_tomcat_10216
user.name = tomcat
java.class.path = /data/project/dlpublic_tomcat_10216/bin/bootstrap.jar:/data/project/dlpublic_tomcat_10216/bin/tomcat-juli.jar
java.naming.factory.initial = org.apache.naming.java.javaURLContextFactory
package.definition = sun.,java.,org.apache.catalina.,org.apache.coyote.,org.apache.jasper.,org.apache.naming.,org.apache.tomcat.
java.vm.specification.version = 1.7
sun.arch.data.model = 64
sun.java.command = org.apache.catalina.startup.Bootstrap start
java.home = /usr/local/jdk1.7.0_79/jre
user.language = en
java.specification.vendor = Oracle Corporation
awt.toolkit = sun.awt.X11.XToolkit
java.vm.info = mixed mode
java.version = 1.7.0_79
java.ext.dirs = /usr/local/jdk1.7.0_79/jre/lib/ext:/usr/java/packages/lib/ext
sun.boot.class.path = /usr/local/jdk1.7.0_79/jre/lib/resources.jar:/usr/local/jdk1.7.0_79/jre/lib/rt.jar:/usr/local/jdk1.7.0_79/jre/lib/sunrsasign.jar:/usr/local/jdk1.7.0_79/jre/lib/jsse.jar:/usr/local/jdk1.7.0_79/jre/lib/jce.jar:/usr/local/jdk1.7.0_79/jre/lib/charsets.jar:/usr/local/jdk1.7.0_79/jre/lib/jfr.jar:/usr/local/jdk1.7.0_79/jre/classes
server.loader =
java.vendor = Oracle Corporation
catalina.base = /data/project/dlpublic_tomcat_10216
file.separator = /
java.vendor.url.bug = http://bugreport.sun.com/bugreport/
common.loader = ${catalina.base}/lib,${catalina.base}/lib/*.jar,${catalina.home}/lib,${catalina.home}/lib/*.jar
sun.io.unicode.encoding = UnicodeLittle
sun.cpu.endian = little
package.access = sun.,org.apache.catalina.,org.apache.coyote.,org.apache.jasper.,org.apache.naming.resources.,org.apache.tomcat.
dlpublic.root = /data/project/dlpublic_tomcat_10216/temp/0-ROOT/
sun.cpu.isalist =
VM Flags:
-Djava.util.logging.config.file=/data/project/dlpublic_tomcat_10216/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager -XX:PermSize=64M -XX:MaxPermSize=128m -Xms512M -Xmx1024M -XX:MaxNewSize=64m -Djava.endorsed.dirs=/data/project/dlpublic_tomcat_10216/endorsed -Dcatalina.base=/data/project/dlpublic_tomcat_10216 -Dcatalina.home=/data/project/dlpublic_tomcat_10216 -Djava.io.tmpdir=/data/project/dlpublic_tomcat_10216/temp
4、jconsole
在CMD中使用jconsole 會使用jconsole的分析工具
5、jmap
用途：觀察運行中的jvm物理內存的佔用狀況，包括Heap size, Perm size等等。
-heap：打印jvm heap的狀況 -histo：打印jvm heap的直方圖。其輸出信息包括類名，對象數量，對象佔用大小。 -histo：live ：同上，可是隻答應存活對象的狀況 -permstat：打印permanent generation heap狀況
打印對象java
[tomcat@1 ~]$ jmap -histo 6308 > 1.txt [tomcat@1 ~]$ less 1.txt num #instances #bytes class name ---------------------------------------------- 1: 798603 60145800 [C 2: 138032 51259048 [B 3: 138630 22365576 <constMethodKlass> 4: 15705 17838152 <constantPoolKlass> 5: 138630 17761120 <methodKlass> 6: 100021 15367808 [I 7: 15705 11664816 <instanceKlassKlass> 8: 12995 9695776 <constantPoolCacheKlass> 9: 401014 9624336 java.lang.String 10: 117855 5835624 [Ljava.lang.Object; 11: 125178 4005696 java.util.HashMap$Entry 12: 50001 4000080 java.lang.reflect.Method 13: 82636 3966528 java.nio.HeapCharBuffer 14: 6165 3514376 <methodDataKlass> 15: 32845 3463040 [Ljava.util.HashMap$Entry; 16: 83804 3352160 java.util.LinkedHashMap$Entry 17: 24894 2904600 [S 18: 42082 2356592 java.util.LinkedHashMap 19: 30932 1979648 java.util.regex.Matcher 20: 16413 1547616 java.lang.Class 21: 56050 1345200 java.util.ArrayList 22: 24454 1202360 [[I 23: 24325 1167600 java.util.HashMap 24: 36116 1155712 java.util.Hashtable$Entry 25: 35515 1136480 java.util.concurrent.ConcurrentHashMap$HashEntry 26: 42637 1023288 java.lang.StringBuilder 27: 15876 1016064 java.net.URL 28: 40710 977040 java.util.concurrent.atomic.AtomicLong 29: 12530 902160 java.lang.reflect.Field 30: 17962 840968 [Ljava.lang.String; 31: 17976 719040 java.lang.ref.SoftReference 32: 21678 693696 java.lang.StackTraceElement 33: 21284 681088 java.lang.ref.WeakReference 34: 27898 669552 java.io.ObjectInputStream$HandleTable$HandleList 35: 16683 667320 java.util.TreeMap$Entry 36: 8901 640872 java.lang.reflect.Constructor 37: 29741 618280 [Ljava.lang.Class; 7042: 1 16 sun.reflect.GeneratedMethodAccessor201 7043: 1 16 org.apache.commons.collections.iterators.EmptyOrderedMapIterator 7044: 1 16 com.google.inject.internal.guava.collect.$Iterators$1 7045: 1 16 sun.reflect.GeneratedMethodAccessor736 7046: 1 16 jenkins.branch.NoTriggerOrganizationFolderProperty$Dispatcher 7047: 1 16 jenkins.model.GlobalNodePropertiesConfiguration$$FastClassByGuice$$e6707da1 7048: 1 16 sun.reflect.GeneratedMethodAccessor29 7049: 1 16 hudson.cli.ListPluginsCommand$$FastClassByGuice$$9650998a 7050: 1 16 sun.reflect.GeneratedMethodAccessor438 7051: 1 16 sun.reflect.GeneratedMethodAccessor474 7052: 1 16 sun.reflect.GeneratedMethodAccessor699 7053: 1 16 hudson.plugins.deploy.DeployPublisher$DescriptorImpl$$FastClassByGuice$$ef30e0c4 7054: 1 16 hudson.matrix.DefaultMatrixExecutionStrategyImpl$DescriptorImpl$$FastClassByGuice$$ce3ec170 7055: 1 16 org.jenkinsci.bytecode.Transformer 7056: 1 16 net.sf.json.util.JavaIdentifierTransformer$UnderscoreJavaIdentifierTransformer 7057: 1 16 java.security.ProtectionDomain$1 7058: 1 16 org.sonatype.plexus.components.sec.dispatcher.DefaultSecDispatcher$__sisu12$$FastClassByGuice$$6869d82e 7059: 1 16 hudson.plugins.emailext.plugins.trigger.FailureTrigger$DescriptorImpl$$FastClassByGuice$$9cb01b39 7060: 1 16 sun.reflect.GeneratedMethodAccessor804 Total 3662258 295584784
打印堆中的信息react
[tomcat@1 ~]$ jmap -heap 6308 Attaching to process ID 6308, please wait... Debugger attached successfully. Server compiler detected. JVM version is 24.79-b02 using thread-local object allocation. Parallel GC with 4 thread(s) Heap Configuration: MinHeapFreeRatio = 0 MaxHeapFreeRatio = 100 MaxHeapSize = 1073741824 (1024.0MB) NewSize = 1310720 (1.25MB) MaxNewSize = 134217728 (128.0MB) OldSize = 5439488 (5.1875MB) NewRatio = 2 SurvivorRatio = 8 PermSize = 268435456 (256.0MB) MaxPermSize = 536870912 (512.0MB) G1HeapRegionSize = 0 (0.0MB) Heap Usage: PS Young Generation Eden Space: capacity = 110100480 (105.0MB) used = 7671208 (7.315834045410156MB) free = 102429272 (97.68416595458984MB) 6.96746099562872% used From Space: capacity = 12058624 (11.5MB) used = 6324288 (6.03131103515625MB) free = 5734336 (5.46868896484375MB) 52.44618291440217% used To Space: capacity = 11534336 (11.0MB) used = 0 (0.0MB) free = 11534336 (11.0MB) 0.0% used PS Old Generation capacity = 402653184 (384.0MB) used = 101235008 (96.54522705078125MB) free = 301418176 (287.45477294921875MB) 25.14198621114095% used PS Perm Generation capacity = 268435456 (256.0MB) used = 88806056 (84.69205474853516MB) free = 179629400 (171.30794525146484MB) 33.082833886146545% used 38659 interned Strings occupying 4321264 bytes.
打印內存信息，生成2進制文件，用來分析web
[tomcat@1 ~]$ jmap -dump:format=b,file=1.bin 6308 Dumping heap to /home/tomcat/1.bin ... Heap dump file created ##會生成一個2進制文件，而後能夠加載到本地來分析。
6、jstat
- jstat：java實時監控工具，通常用來調優（gc）
- 命令
jstat -<option> [-t] [-h<lines>] <vmid> [<interval> [<count>]]
- 參數
-class：統計class loader行爲信息 -compile：統計編譯行爲信息 -gc：統計jdk gc時heap信息 -gccapacity：統計不一樣的generations（不知道怎麼翻譯好，包括新生區，老年區，permanent區）相應的heap容量狀況 -gccause：統計gc的狀況，（同-gcutil）和引發gc的事件 -gcnew：統計gc時，新生代的狀況 -gcnewcapacity：統計gc時，新生代heap容量 -gcold：統計gc時，老年區的狀況 -gcoldcapacity：統計gc時，老年區heap容量 -gcpermcapacity：統計gc時，permanent區heap容量 -gcutil：統計gc時，heap狀況
- 打印class的實時數據
打印pid=6308的實時class信息，沒1000ms打印一次，總共打印5次 [tomcat@1 ~]$ jstat -class 6308 1000 5 Loaded Bytes Unloaded Bytes Time 18861 34897.7 3122 3776.6 11.91 18861 34897.7 3122 3776.6 11.91 18861 34897.7 3122 3776.6 11.91 18861 34897.7 3122 3776.6 11.91 18861 34897.7 3122 3776.6 11.91
- 打印實時編譯的class
[tomcat@1 ~]$ jstat -compiler 6308
Compiled Failed Invalid Time FailedType FailedMethod
3780 1 0 120.26 2 com/xxx/xxx run
- 打印gc的信息參數信息
S0C：Current survivor space 0 capacity (當前S0的大小). S1C：Current survivor space 1 capacity (KB). S0U：Current survivor space 0 utilization (KB)(當前S0的可用大小). S1U：Current survivor space 1 utilization(KB). EC：Current eden space capacity(KB). EU：Eden space utilization(KB). OC：Current old space capacity(KB). OU：Old space utilization (KB). PC：Current permanent space capacity (KB). PU：Permanent space utilization (KB). YGC：Number of young generation GC Events. YGCT：Young generation garbage collection time. FGC：Number of full GC events. FGCT：Full garbage collection time. GCT：Total garbage collection time.
- 打印gc的信息（百分比）
[tomcat@1 ~]$ jstat -gcutil 6308 1000 5 S0 S1 E O P YGC YGCT FGC FGCT GCT 0.00 3.13 24.21 26.43 33.11 987 13.012 3 2.524 15.536 0.00 3.13 24.21 26.43 33.11 987 13.012 3 2.524 15.536 0.00 3.13 24.21 26.43 33.11 987 13.012 3 2.524 15.536 0.00 3.13 24.21 26.43 33.11 987 13.012 3 2.524 15.536 0.00 3.13 24.21 26.43 33.11 987 13.012 3 2.524 15.536
- 打印gc數據(具體)
[tomcat@1 ~]$ jstat -gc 6308 1000 5 S0C S1C S0U S1U EC EU OC OU PC PU YGC YGCT FGC FGCT GCT 12288.0 14336.0 7776.0 0.0 102400.0 1417.3 393216.0 103757.4 262144.0 86786.8 984 12.989 3 2.524 15.513 12288.0 14336.0 7776.0 0.0 102400.0 1473.8 393216.0 103757.4 262144.0 86786.8 984 12.989 3 2.524 15.513 12288.0 14336.0 7776.0 0.0 102400.0 1491.6 393216.0 103757.4 262144.0 86786.8 984 12.989 3 2.524 15.513 12288.0 14336.0 7776.0 0.0 102400.0 1495.8 393216.0 103757.4 262144.0 86786.8 984 12.989 3 2.524 15.513 12288.0 14336.0 7776.0 0.0 102400.0 1510.6 393216.0 103757.4 262144.0 86786.8 984 12.989 3 2.524 15.513
- 打印perm、new、old的信息
[tomcat@1 ~]$ jstat -gccapacity 6308 1000 5 NGCMN NGCMX NGC S0C S1C EC OGCMN OGCMX OGC OC PGCMN PGCMX PGC PC YGC FGC 131072.0 131072.0 131072.0 14336.0 14848.0 101376.0 393216.0 917504.0 393216.0 393216.0 262144.0 524288.0 262144.0 262144.0 987 3 131072.0 131072.0 131072.0 14336.0 14848.0 101376.0 393216.0 917504.0 393216.0 393216.0 262144.0 524288.0 262144.0 262144.0 987 3 131072.0 131072.0 131072.0 14336.0 14848.0 101376.0 393216.0 917504.0 393216.0 393216.0 262144.0 524288.0 262144.0 262144.0 987 3 131072.0 131072.0 131072.0 14336.0 14848.0 101376.0 393216.0 917504.0 393216.0 393216.0 262144.0 524288.0 262144.0 262144.0 987 3 131072.0 131072.0 131072.0 14336.0 14848.0 101376.0 393216.0 917504.0 393216.0 393216.0 262144.0 524288.0 262144.0 262144.0 987 3
7、jstack
- jstack：打印棧信息，java實時監控工具，通常用來調優（鎖）
- 命令
jstack [-l] <pid>
- 參數
-l：列出當前java應用的線程狀態
- 用 top列出CPU消耗高的java應用
[tomcat@idanlu-kaifa-63 ~]$ top top - 13:59:44 up 63 days, 21:46, 5 users, load average: 0.15, 0.15, 0.19 Tasks: 169 total, 1 running, 168 sleeping, 0 stopped, 0 zombie %Cpu(s): 1.7 us, 1.3 sy, 0.0 ni, 96.9 id, 0.0 wa, 0.0 hi, 0.1 si, 0.0 st KiB Mem : 40070540 total, 586648 free, 32520668 used, 6963224 buff/cache KiB Swap: 2097148 total, 2120 free, 2095028 used. 7169184 avail Mem PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 4062 tomcat 20 0 3039200 568372 4936 S 1.0 1.4 1358:19 java 16372 tomcat 20 0 3290404 699572 23480 S 1.0 1.7 5:11.30 java 16657 tomcat 20 0 3072308 650000 23460 S 1.0 1.6 7:00.49 java 17701 tomcat 20 0 3544120 1.195g 12040 S 0.7 3.1 1:39.45 java 19372 tomcat 20 0 3056204 295384 5860 S 0.7 0.7 41:29.62 java 28021 tomcat 20 0 3774392 1.215g 11832 S 0.7 3.2 58:19.12 java
- 用 top -Hl pid 顯示應用中的線程運行狀態
[tomcat@idanlu-kaifa-63 ~]$ top -Hp 4062 top - 14:02:19 up 63 days, 21:49, 5 users, load average: 0.09, 0.14, 0.18 Threads: 60 total, 0 running, 60 sleeping, 0 stopped, 0 zombie %Cpu(s): 1.5 us, 1.3 sy, 0.0 ni, 97.1 id, 0.1 wa, 0.0 hi, 0.0 si, 0.0 st KiB Mem : 40070540 total, 583372 free, 32521324 used, 6965844 buff/cache KiB Swap: 2097148 total, 2120 free, 2095028 used. 7168508 avail Mem PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND 4127 tomcat 20 0 3039200 568372 4936 S 0.3 1.4 4:10.92 java 4062 tomcat 20 0 3039200 568372 4936 S 0.0 1.4 0:00.00 java 4070 tomcat 20 0 3039200 568372 4936 S 0.0 1.4 0:08.77 java 4071 tomcat 20 0 3039200 568372 4936 S 0.0 1.4 0:05.45 java 4072 tomcat 20 0 3039200 568372 4936 S 0.0 1.4 0:05.46 java 4073 tomcat 20 0 3039200 568372 4936 S 0.0 1.4 0:05.38 java 4074 tomcat 20 0 3039200 568372 4936 S 0.0 1.4 0:05.38 java 4075 tomcat 20 0 3039200 568372 4936 S 0.0 1.4 2:25.77 java 4076 tomcat 20 0 3039200 568372 4936 S 0.0 1.4 0:00.02 java 4077 tomcat 20 0 3039200 568372 4936 S 0.0 1.4 0:00.03 java 4078 tomcat 20 0 3039200 568372 4936 S 0.0 1.4 0:00.00 java 4079 tomcat 20 0 3039200 568372 4936 S 0.0 1.4 0:14.96 java 4080 tomcat 20 0 3039200 568372 4936 S 0.0 1.4 0:12.26 java 4081 tomcat 20 0 3039200 568372 4936 S 0.0 1.4 0:00.00 java 4082 tomcat 20 0 3039200 568372 4936 S 0.0 1.4 36:12.95 java 4089 tomcat 20 0 3039200 568372 4936 S 0.0 1.4 0:42.04 java 4090 tomcat 20 0 3039200 568372 4936 S 0.0 1.4 0:00.72 java 4091 tomcat 20 0 3039200 568372 4936 S 0.0 1.4 1:16.72 java 4092 tomcat 20 0 3039200 568372 4936 S 0.0 1.4 0:00.03 java 4093 tomcat 20 0 3039200 568372 4936 S 0.0 1.4 0:01.84 java 4094 tomcat 20 0 3039200 568372 4936 S 0.0 1.4 3:57.18 java 4095 tomcat 20 0 3039200 568372 4936 S 0.0 1.4 3:55.29 java 4096 tomcat 20 0 3039200 568372 4936 S 0.0 1.4 3:56.72 java 4097 tomcat 20 0 3039200 568372 4936 S 0.0 1.4 4:04.82 java 4098 tomcat 20 0 3039200 568372 4936 S 0.0 1.4 3:53.77 java 4099 tomcat 20 0 3039200 568372 4936 S 0.0 1.4 4:48.47 java 4100 tomcat 20 0 3039200 568372 4936 S 0.0 1.4 2:38.50 java 4102 tomcat 20 0 3039200 568372 4936 S 0.0 1.4 1164:36 java
- 選取運行CPU高，時長長的線程tid。轉換爲16位
[tomcat@idanlu-kaifa-63 ~]$ printf "%x\n" 4102 101f
- 用jstack -l pid> 1.txt 打印應用的線程狀況，間隔一段時間，多打印幾回。查找相關 nid
"notify-remoting-reactor-0" prio=10 tid=0x00007f03ed0b3000 nid=0x101f runnable [0x00007f03e0ad1000] java.lang.Thread.State: RUNNABLE at sun.nio.ch.EPollArrayWrapper.epollWait(Native Method) at sun.nio.ch.EPollArrayWrapper.poll(EPollArrayWrapper.java:269) at sun.nio.ch.EPollSelectorImpl.doSelect(EPollSelectorImpl.java:79) at sun.nio.ch.SelectorImpl.lockAndDoSelect(SelectorImpl.java:87) - locked <0x00000000e0f4a698> (a sun.nio.ch.Util$2) - locked <0x00000000e0f4a688> (a java.util.Collections$UnmodifiableSet) - locked <0x00000000e0f4a570> (a sun.nio.ch.EPollSelectorImpl) at sun.nio.ch.SelectorImpl.select(SelectorImpl.java:98) at com.taobao.gecko.core.nio.impl.Reactor.select(Reactor.java:334) at com.taobao.gecko.core.nio.impl.Reactor.run(Reactor.java:236)
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