> For what it is worth, we run vanilla RedHat 8.0 servers and have to
> bump
> up the number handles available to Tomcat using ulimit, (otherwise it
> is
> limited to ~1024). We have a complex application that does a lot of
> proxied access work. Despite that, we have only run out of file
> descriptors once in several years during what we think was a DOS
> attack.
> Remember, each socket gets a file descriptor as well.
Yes. So we have 500 clients and this uses a pool of SQL connections (about
120). Everything else is local open files. Mostly jar and java that doesn't seem to be
shared. That's strange.
> It seems unlikely that the FDs are being consumed by Tomcat if your
> log
> files look normal. Does the number of file handles climb steadily over
> time or rapidly balloon beyond norms on startup? What build of Linux
> is
> on the box in question?
It is a RedHat enterprise server 2.1 (due to silly constructor support restrictions).
I just saw the problem today, so I don't saw it coming up. The service was restarted
this morning and two hours later, it already reached the current score. This night, it
will be dead...
On another machine running about the same type of applications (and two tomcat
instances), I "only" have 8000FDs opened (which could be correcte regarding the number
of jars, connections and log files).
Fran�ois.
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