使用 ulimit -a 命令, 查看 max user processes 的输出, 就是系统最大进程数
- core file size (blocks, -c) unlimited
- data seg size (kbytes, -d) unlimited
- scheduling priority (-e) 0
- file size (blocks, -f) unlimited
- pending signals (-i) 31216
- max locked memory (kbytes, -l) 16384
- max memory size (kbytes, -m) unlimited
- open files (-n) 1024
- pipe size (512 bytes, -p) 8
- POSIX message queues (bytes, -q) 819200
- real-time priority (-r) 0
- stack size (kbytes, -s) 8192
- CPU time (seconds, -t) unlimited
- max user processes (-u) 31216
- virtual memory (kbytes, -v) unlimited
- file locks (-x) unlimited
max user processes 的值默认是 # cat /proc/sys/kernel/threads-max 的值 / 2, 即系统线程数的一半
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