Number of open file descriptors
In Solaris 10 we have the following two kernel parameters:
rlim_fd_max - which has a default value of 65536
rlim_fd_cur - which has a default value of 256
However to see what these values are, you run the following command:
kstat -n file_cache
and look at the buf_total or buf_max - but they don't match the 65536 number.
On my system I have rlim_fd_cur set to 576 and the max at the default, which I confirmed with a 'sysdef' but when I run a kstat -n it comes back as 1740.
Can anyone explain the difference?
Thanks,
Kevin D.
[593 byte] By [
dedke01a] at [2007-11-27 6:04:04]
# 1
> In Solaris 10 we have the following two kernel
> parameters:
> rlim_fd_max - which has a default value of 65536
> rlim_fd_cur - which has a default value of 256
>
> However to see what these values are, you run the
> following command:
>
> kstat -n file_cache
What leads you to believe that?
> and look at the buf_total or buf_max - but they don't
> match the 65536 number.
No. The fd limits are per-process limits on file descriptors. file_cache appears to hold details about how the system-wide file cache is in use. They are not the same thing.
> On my system I have rlim_fd_cur set to 576 and the
> max at the default, which I confirmed with a 'sysdef'
> but when I run a kstat -n it comes back as 1740.
>
> Can anyone explain the difference?
I don't think they're related.
--
Darren
# 2
Hi Darren,
I did some more research and I have confirmed that the following command:
kstat -n file_cache | grep buf_max or buf_inuse
Will show the "system wide" usage of every processes file descriptor usage. Now Solaris kernel dynamically increases this value when the buf_inuse is exceeded.
Thanks for your help.
Regards,
Kevin
