ulimit -u 2000 and
ulimit -Su 2000 to modify the 'Max processes', and started up my program, but failed. I found file '/proc/pid/limit' is still:
Max processes 1024 2000 processes
How could I change the soft limit?
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ulimit -a show?
You're likely at the global max limit or are encountering a permissions issue. I tried your experiment and it worked just fine for me.
The output of a
/proc/pid/limits looks like the following:
$ cat /proc/22666/limits | grep processes Max processes 1024 62265 processes $ ulimit -a | grep processes max user processes (-u) 1024
Setting the soft limit to 2000:
$ ulimit -Su 2000 $ ulimit -a | grep processes max user processes (-u) 2000 $ cat /proc/22666/limits | grep processes Max processes 2000 62265 processes
I'd take a look at your
/etc/security/limits.conf file and see if there is a limit coming from that file that's keeping regular users from changing this limit
I'd also look in the directory,
/etc/security/limit.d/. There are additional files often times there which include more limits. For example on my Fedora system I have this file:
$ cat /etc/security/limits.d/90-nproc.conf # Default limit for number of user's processes to prevent # accidental fork bombs. # See rhbz #432903 for reasoning. * soft nproc 1024