Maximum number of threads in a Linux System

The maximum number of threads for a process depends on three factors: the thread stack size, the maximum memory size of the process, and the number of operating system digits.
View system default values:
[Root @ c0109 ~] # Cat/proc/sys/kernel/threads-max
57709

Adjust the stack size:
[Root @ c0109 ~] # Ulimit-S

Modify the default value:

[Root @ c0109 ~] # Echo XXX>/proc/sys/kernel/threads-max

Test:

# Include <stdio. h> # include <pthread. h> # include <sys/Wait. h> void * Foo () {While (1) sleep (1) ;}int main () {int I = 0; pthread_t thread; while (1) {If (pthread_create (& Thread, null, Foo, null )! = 0) {printf ("thread create failed! \ N "); return 1;} printf (" % d \ n ", ++ I);} return 0 ;}

Compile:

Gcc-O test. C-lpthread