RE: [squid-users] Increasing Filedescriptors on Linux - WARNING! Your cache isruuning out of filedescriptors

Which version of squid are you using? If your are using a 2.4 series from RedHat most likely squid will not be able to go over the 1024 limit without being patched (I found this out the hard way). squid 2.5 stable5 has the patch. I am not sure when the squid developers put it in. Once you get a version of squid that has the patch you need to set your ulimit to the max number of file descriptors your want your squid to able to use (from the command line) then compile.

Like so:
# ulimit -HSn 8192 (I used 8192)
# ./configure ...
# make
# make install

Then do/verify the following:
1. Change the init script so it sets the limit to 8192 (or whatever number you pick) before running squid.
2. Verify /proc/sys/fs/file-max is set high enough (mine was by default)
3. Set /etc/security/limits.conf to allow the squid userid to use up to 8192 file descriptors.

That should do it.

Steve

-----Original Message-----
From: Mathew Thomas [mailto:mathew.thomas@rmit.edu.au]
Sent: Thursday, April 15, 2004 7:52 PM
To: squid-users@squid-cache.org
Subject: [squid-users] Increasing Filedescriptors on Linux - WARNING!
Your cache isruuning out of filedescriptors

Hi

I am bit confused about increasing the filedescriptors. My two proxy server's cache.log is flooded with the error
message:
"WARNING! Your cache is running out of filedescriptors". I could see from the Cache Manager that squid is using only
1024 FD.
I read the Henrik document at the web site http://devel.squid-cache.org/hno/linux-lfd.html.

I have got few question about increasing the Filedescriptors: Below the questions are my current (default) values:

1) Do I need to increase the value in /proc/sys/fs/file-max? Another 50%?
2) How much can I increase the vale for " ulimit -HSn ####" without causing any performance degradation?
3) Regarding the step "Edit /usr/include/bits/types.h to define __FD_SETSIZE ....". Which value should I put it here -
the value in "cat /proc/sys/fs/file-max" or the value in " ulimit -HSn ####" ?
4) Is the default value below for "/proc/sys/net/ipv4/ip_local_port_range" , the " /proc/sys/kernel/threads-max"
and " cat /proc/sys/kernel/threads-max" alright or should I increase it?

My system : Red Hat ES 3.0, Kernel - 2.4.21-9.0.1, glibc version 2.3.2-95.6 ( System: HP ML 530 with 2x3.0GHz Xeon
CPU, 8GB Mem 6x35GB for cache)
#cat /proc/sys/fs/file-max
838860
#cat /proc/sys/net/ipv4/ip_local_port_range
32768 61000
#cat /proc/sys/net/ipv4/tcp_max_syn_backlog
1024
# cat /proc/sys/kernel/threads-max
14336

Info from Cache Manager
File descriptor usage for squid:
        Maximum number of file descriptors: 1024
        Largest file desc currently in use: 780
        Number of file desc currently in use: 729
        Files queued for open: 0
        Available number of file descriptors: 295
        Reserved number of file descriptors: 100
        Store Disk files open: 43

Thanks in advance for the help.

Mathew
RMIT University
Received on Thu Apr 15 2004 - 20:57:12 MDT