jvm参数
2017-12-07 本文已影响0人
吃花生的小猴子
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function start() {
JAVA_OPTS="$JAVA_OPTS -server
-Xmx512m
-Xms256m
-Xmn256m
-XX:MetaspaceSize=64m
-XX:MaxMetaspaceSize=256m
-Xss256k
-XX:+ExplicitGCInvokesConcurrent
-XX:+UseConcMarkSweepGC
-XX:+UseCMSInitiatingOccupancyOnly
-XX:CMSInitiatingOccupancyFraction=70
-XX:-UseBiasedLocking
-XX:AutoBoxCacheMax=20000
-XX:MaxTenuringThreshold=6
-Xloggc:/dev/shm/gc_maila-manager-web.log
-XX:+PrintGCApplicationStoppedTime
-XX:+PrintGCDateStamps
-XX:+PrintGCDetails
-XX:+PrintCodeCache
-XX:+UseGCLogFileRotation
-XX:NumberOfGCLogFiles=2
-XX:GCLogFileSize=10m
-XX:+HeapDumpOnOutOfMemoryError
-XX:HeapDumpPath=/home/admin/logs/ "
nohup java $JAVA_OPTS -jar /home/admin/duiba-deploy/maila-manager-web/maila-manager-deploy/build/libs/maila-manager-web.jar --spring.profiles.active=pre --spring.cloud.config.uri=http://configserver.duiba.com.cn > /dev/null &
}
function stop() {
process=`ps -ef | grep 'maila-manager-web.jar' | grep -v "grep"|grep -v "restart"|grep -v "stop"| wc -l`
if [[ 0 != $process ]];then
ps -ef | grep 'maila-manager-web.jar' | grep -v "grep"|grep -v "stop"|grep -v "restart"| awk '{print $2}' | xargs kill -15
fi
sleep 10
if [[ 0 != $process ]];then
ps -ef | grep 'maila-manager-web.jar' | grep -v "grep"|grep -v "stop"|grep -v "restart"| awk '{print $2}' | xargs kill -9
fi
}
function restart() {
stop;
sleep 1;
start;
}
function status() {
ps -ef | grep 'maila-manager-web.jar' | grep -v grep| awk '{print $2}'
}
function help() {
echo "$0 |start|stop|restart|status|"
}
Xss 栈空间大小。每个线程执行都有其对应的线程栈，用于存放线程执行相关的本地变量，比如方法调用信息等。如果方法调用层次很深（递归），那么应该适当加大此参数配置。此空间的分配来自于操作系统内存，不分配于jvm内存，但却与堆的大小相关。在java中每new一个线程，jvm都是向操作系统请求new一个本地线程，此时操作系统会使用剩余的内存空间来为线程分配内存，而不是使用jvm的内存。这样，当操作系统的可用内存越少，则jvm可用创建的新线程也就越少。比如随着-Xmx的加大，空闲的内存数就更少，那么可以创建的线程也就更少。
-XX:+PrintGC ：简要gc信息
0.234: [GC (Allocation Failure) 512K->400K(1536K), 0.0023670 secs]
0.309: [GC (Allocation Failure) 908K->480K(1536K), 0.0115048 secs]
0.415: [GC (Allocation Failure) 992K->548K(1536K), 0.0116569 secs]
0.489: [GC (Allocation Failure) 1060K->548K(1536K), 0.0118201 secs]
0.573: [GC (Allocation Failure) 1044K->788K(1536K), 0.0010058 secs]
0.600: [GC (Allocation Failure) -- 1300K->1512K(1536K), 0.0013921 secs]
0.602: [Full GC (Ergonomics) 1512K->617K(1536K), 0.0264870 secs]
0.629: [Full GC (Ergonomics) 997K->997K(1536K), 0.0278348 secs]
0.657: [Full GC (Allocation Failure) 997K->982K(1536K), 0.0274462 secs]
-XX:+PrintGCDateStamps 记录gc时间
2017-12-11T19:18:12.754-0800: 0.155: [GC (Allocation Failure) [PSYoungGen: 512K->432K(1024K)] 512K->432K(1536K), 0.0010447 secs] [Times: user=0.00 sys=0.00, real=0.00 scs]
-XX:+PrintGCDetails 输出GC的详细日志
2017-12-11T19:22:03.684-0800: 0.381: [GC (Allocation Failure) [PSYoungGen: 1005K->496K(1024K)] 1127K->834K(1536K), 0.0030809 secs] [Times: user=0.01 sys=0.00, real=0.00 secs]
2017-12-11T19:22:03.687-0800: 0.384: [Full GC (Ergonomics) [PSYoungGen: 496K->495K(1024K)] [ParOldGen: 338K->208K(512K)] 834K->703K(1536K), [Metaspace: 3314K->3314K(1056768K)], 0.0067339 secs] [Times: user=0.01 sys=0.00, real=0.01 secs]
2017-12-11T19:22:03.695-0800: 0.392: [GC (Allocation Failure) --[PSYoungGen: 1007K->1007K(1024K)] 1215K->1511K(1536K), 0.0013120 secs] [Times: user=0.00 sys=0.00, real=0.00 secs]
2017-12-11T19:22:03.696-0800: 0.393: [Full GC (Ergonomics) [PSYoungGen: 1007K->114K(1024K)] [ParOldGen: 504K->501K(512K)] 1511K->616K(1536K), [Metaspace: 3315K->3315K(1056768K)], 0.0086868 secs] [Times: user=0.02 sys=0.00, real=0.01 secs]
2017-12-11T19:22:03.705-0800: 0.403: [Full GC (Ergonomics) [PSYoungGen: 494K->494K(1024K)] [ParOldGen: 501K->501K(512K)] 996K->996K(1536K), [Metaspace: 3315K->3315K(1056768K)], 0.0104646 secs] [Times: user=0.03 sys=0.00, real=0.01 secs]
2017-12-11T19:22:03.716-0800: 0.413: [Full GC (Allocation Failure) [PSYoungGen: 494K->494K(1024K)] [ParOldGen: 501K->488K(512K)] 996K->982K(1536K), [Metaspace: 3315K->3315K(1056768K)], 0.0116172 secs] [Times: user=0.02 sys=0.00, real=0.01 secs]
Heap
PSYoungGen total 1024K, used 512K [0x00000007bfe80000, 0x00000007c0000000, 0x00000007c0000000)
eden space 512K, 100% used [0x00000007bfe80000,0x00000007bff00000,0x00000007bff00000)
from space 512K, 0% used [0x00000007bff00000,0x00000007bff00000,0x00000007bff80000)
to space 512K, 76% used [0x00000007bff80000,0x00000007bffe2330,0x00000007c0000000)
ParOldGen total 512K, used 502K [0x00000007bfe00000, 0x00000007bfe80000, 0x00000007bfe80000)
object space 512K, 98% used [0x00000007bfe00000,0x00000007bfe7d8a0,0x00000007bfe80000)
Metaspace used 3348K, capacity 4496K, committed 4864K, reserved 1056768K
class space used 372K, capacity 388K, committed 512K, reserved 1048576K
-XX:+PrintHeapAtGC 每次gc前后都会打印堆信息
{Heap before GC invocations=1 (full 0):
PSYoungGen total 1024K, used 512K [0x00000007bfe80000, 0x00000007c0000000, 0x00000007c0000000)
eden space 512K, 100% used [0x00000007bfe80000,0x00000007bff00000,0x00000007bff00000)
from space 512K, 0% used [0x00000007bff80000,0x00000007bff80000,0x00000007c0000000)
to space 512K, 0% used [0x00000007bff00000,0x00000007bff00000,0x00000007bff80000)
ParOldGen total 512K, used 0K [0x00000007bfe00000, 0x00000007bfe80000, 0x00000007bfe80000)
object space 512K, 0% used [0x00000007bfe00000,0x00000007bfe00000,0x00000007bfe80000)
Metaspace used 2097K, capacity 4480K, committed 4480K, reserved 1056768K
class space used 230K, capacity 384K, committed 384K, reserved 1048576K
2017-12-11T19:24:50.318-0800: 0.258: [GC (Allocation Failure) [PSYoungGen: 512K->400K(1024K)] 512K->400K(1536K), 0.0135751 secs] [Times: user=0.00 sys=0.00, real=0.02 secs]
Heap after GC invocations=1 (full 0):
PSYoungGen total 1024K, used 400K [0x00000007bfe80000, 0x00000007c0000000, 0x00000007c0000000)
eden space 512K, 0% used [0x00000007bfe80000,0x00000007bfe80000,0x00000007bff00000)
from space 512K, 78% used [0x00000007bff00000,0x00000007bff64010,0x00000007bff80000)
to space 512K, 0% used [0x00000007bff80000,0x00000007bff80000,0x00000007c0000000)
ParOldGen total 512K, used 0K [0x00000007bfe00000, 0x00000007bfe80000, 0x00000007bfe80000)
object space 512K, 0% used [0x00000007bfe00000,0x00000007bfe00000,0x00000007bfe80000)
Metaspace used 2097K, capacity 4480K, committed 4480K, reserved 1056768K
class space used 230K, capacity 384K, committed 384K, reserved 1048576K
}
-XX:+PrintGCTimeStamps 打印系统启动后到gc发生经过了多少时间。如下：0.106秒，0.157秒，0.212秒 发生了3次gc
0.106: [GC (Allocation Failure) [PSYoungGen: 512K->416K(1024K)] 512K->416K(1536K), 0.0094628 secs] [Times: user=0.01 sys=0.00, real=0.01 secs]
0.157: [GC (Allocation Failure) [PSYoungGen: 924K->480K(1024K)] 924K->480K(1536K), 0.0006946 secs] [Times: user=0.01 sys=0.00, real=0.00 secs]
0.212: [GC (Allocation Failure) [PSYoungGen: 992K->512K(1024K)] 992K->586K(1536K), 0.0027471 secs] [Times: user=0.00 sys=0.00, real=0.01 secs]
-XX:+PrintGCApplicationConcurrentTime 打印应用的执行时间
0.096: [GC (Allocation Failure) [PSYoungGen: 512K->416K(1024K)] 512K->416K(1536K), 0.0018458 secs] [Times: user=0.00 sys=0.00, real=0.01 secs]
0.156: Application time: 0.0581703 seconds
0.156: [GC (Allocation Failure) [PSYoungGen: 924K->448K(1024K)] 924K->448K(1536K), 0.0013974 secs] [Times: user=0.01 sys=0.00, real=0.00 secs]
0.201: Application time: 0.0428315 seconds
-XX:+PrintGCApplicationStoppedTime 打印gc停顿时间
0.103: [GC (Allocation Failure) [PSYoungGen: 512K->384K(1024K)] 512K->384K(1536K), 0.0007675 secs] [Times: user=0.01 sys=0.00, real=0.01 secs]
0.104: Total time for which application threads were stopped: 0.0008867 seconds, Stopping threads took: 0.0000085 seconds
-XX:+PrintReferenceGC 跟踪软，弱，虚和Finallize队列
0.113: [GC (Allocation Failure) 0.115: [SoftReference, 0 refs, 0.0000443 secs]0.115: [WeakReference, 7 refs, 0.0000054 secs]0.115: [FinalReference, 5 refs, 0.0000169 secs]0.115: [PhantomReference, 0 refs, 0 refs, 0.0000041 secs]0.115: [JNI Weak Reference, 0.0000064 secs][PSYoungGen: 512K->416K(1024K)] 512K->416K(1536K), 0.0022235 secs] [Times: user=0.01 sys=0.00, real=0.00 secs]
0.173: [GC (Allocation Failure) 0.175: [SoftReference, 0 refs, 0.0000713 secs]0.175: [WeakReference, 9 refs, 0.0000195 secs]0.175: [FinalReference, 69 refs, 0.0000802 secs]0.175: [PhantomReference, 0 refs, 0 refs, 0.0000139 secs]0.175: [JNI Weak Reference, 0.0000102 secs][PSYoungGen: 924K->480K(1024K)] 924K->480K(1536K), 0.0024862 secs] [Times: user=0.00 sys=0.00, real=0.00 secs]
