linux最大进程数

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