Modify 'Soft Limit' of 'Max processes'
What does 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.
Example
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
What else?
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
References
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phemmer
Updated on September 18, 2022Comments
-
phemmer almost 2 years
I tried
ulimit -u 2000
andulimit -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?
-
phemmer over 10 yearsActually the
/proc/pid/limit
output he shows indicates the hard limit is at 2000 and the soft limit still at 1024.