John R. McPherson wrote:
>> Roger wrote:
>>
>>> I am running an application server on Red Hat 8.0 and every so often
the
>>> machine generates an error message "Too many files open" and then
locks
>>> up. I have to restart the machine from the console to rectify the
>>> situation. Can anyone please tell me if there is some configuration
>>> setting that I can change to increase the number of permitted
files? Is
>>> there some command that allows me to monitor the number of open
files in
>>> the system?
>>
>>
>> The other reply was for kernel version 2.6-something, but as far as I
>> know, under kernel 2.4.x and earlier, there is a hard-coded limit in
>> the kernel - /usr/include/linux/limits.h has
>> #define OPEN_MAX 256 /* # open files a process may have
*/
>> (but that is per-process, not in total).
>>
>> You could install and try the lsof(8) command - I haven't used it
>> much, but it stands for "LiSt Open Files", so it sounds like what you
>> want :p
>
>er, no.
>
>Under 2.4 a process can have a stupidly large number of fd's open, you
>need to modify /proc/sys/fs/file-max and perhaps /proc/sys/fs/inode-max
>which is the system wide limit, to raise the limit per process you can
>use ulimit to raise it above the 256 (default limit) you mentioned
above.
>
>Running out of fd's is a pretty nasty business, what on earth are you
>doing to that poor machine? Are you running lots of programs? (like,
>hundreds of copies of something?)
>
That is part of the problem, I am not precisely sure why there are so
many files opened. I am running a fairly large J2EE application on
JBoss and it seems to load heaps of files into the JVM. I may need to
change some settings in JBoss, but that of course is the subject for
another forum.
Thanks for all the help.
Roger
