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Old 09-07-2006, 04:04 AM   #1
Honor
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How many thread can be created in user space program?


Does the kernel have define the maximum thread number?

Thanks in advance.
 
Old 09-08-2006, 06:45 AM   #2
stress_junkie
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Kernel system wide maximum.
Code:
$ cat /proc/sys/kernel/threads-max
16383
Variable limit set per user during login.
Code:
$ ulimit -a
core file size          (blocks, -c) 0
data seg size           (kbytes, -d) unlimited
file size               (blocks, -f) unlimited
pending signals                 (-i) 8191
max locked memory       (kbytes, -l) 32
max memory size         (kbytes, -m) unlimited
open files                      (-n) 1024
pipe size            (512 bytes, -p) 8
POSIX message queues     (bytes, -q) 819200
stack size              (kbytes, -s) 8192
cpu time               (seconds, -t) unlimited
max user processes              (-u) 8191
virtual memory          (kbytes, -v) unlimited
file locks                      (-x) unlimited
$
Note that the ulimit values shown are okay for an interactive user on a workstation. Server processes such as ftp should have lower limits in order to avoid being susceptible to a fork attack. A fork attack is when a bad guy "freezes" your server by causing some remotely accessible process such as a server daemon to spawn a gajillion subprocesses. This overwhelms the kernel's ability to manage resources and the system will hang.

Last edited by stress_junkie; 09-08-2006 at 07:11 AM.
 
  


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