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jvm到底能运行多少个线程     所属分类 jvm 浏览量 34
影响因素
jvm配置 -Xms -Xmx -Xss

-Xss
the stack size for each thread

-Xmx1024m -Xms1024m  -Xss128k

jcmd 15611 VM.flags -all

intx ThreadStackSize  = 1024    {pd product}


系统限制

max_user_process(ulimit -u)

/proc/sys/kernel/pid_max
/proc/sys/kernel/thread-max
/proc/sys/vm/max_map_count


cat /proc/sys/kernel/pid_max
32768  (32K)
ulimit -u
7282
cat /proc/sys/vm/max_map_count
65530

cat /proc/sys/kernel/thread-max
cat: /proc/sys/kernel/thread-max: 没有那个文件或目录




MaxThreadCountTest https://gitee.com/dyyx/hellocode/blob/master/src/MaxThreadCountTest.java java MaxThreadCountTest java.lang.OutOfMemoryError: unable to create new native thread java -Xss128k MaxThreadCountTest The stack size specified is too small, Specify at least 228k java -Xss256k MaxThreadCountTest java MaxThreadCountTest java.lang.OutOfMemoryError: unable to create new native thread 8005 ulimit -u 10000 ulimit -u 60000 -bash: ulimit: max user processes: 无法修改 limit 值: 不允许的操作 sudo ulimit -n 65535 sudo: ulimit: command not found 用以下方式修改 !!! sudo sh -c "ulimit -u 60000 && exec su $LOGNAME" ulimit is a shell builtin like cd, not a separate program. sudo looks for a binary to run, but there is no ulimit binary, which is why you get the error message. You need to run it in a shell. /opt/jdk1.8.0_171/bin/java MaxThreadCountTest java.lang.OutOfMemoryError: unable to create new native thread 63541
jvm参数查看 Linux常用优化设置

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