Jeremy Chadwick wrote:
On Sat, Sep 27, 2008 at 11:10:01AM +1000, Aristedes Maniatis wrote:
By default FreeBSD 7.0 shipped with the sysctls set to:
kern.maxfiles: 12328
kern.maxfilesperproc: 11095
[...]
Anyway, I'd like to know why you have so many fds open simultaneously in
the first place. We're talking over 11,000 fds actively open at once --
this is not a small number. What exactly is this machine doing? Are
you absolutely certain tuning this higher is justified? Have you looked
into the possibility that you have a program which is exhausting fds by
not closing them when finished? (Yes, this is quite common; I've seen
bad Java code cause this problem on Solaris.)
I can imagine some webhosting machine running Apache virtualhosts. Each
virtual host using 3 logfiles (access log, error log, IO log) so it is
"only" about 4000 domains (virtualhosts) which is not so uncommon in
these days ;)
I don't know what files are "really" open in the meaning of
kern.maxfiles. I have webserver with about 100 hosted domains and there
is some numbers:
[EMAIL PROTECTED] ~/# fstat -u www | wc -l
9931
[EMAIL PROTECTED] ~/# fstat -u root | wc -l
718
[EMAIL PROTECTED] ~/# fstat | grep httpd | wc -l
6379
[EMAIL PROTECTED] ~/# fstat | grep httpd | wc -l
6002
[EMAIL PROTECTED] ~/# fstat -u www | wc -l
4691
[EMAIL PROTECTED] ~/# sysctl kern.openfiles
kern.openfiles: 846
All above taken within few seconds.
Can somebody explain the difference between kern.openfiles and fstat?
Miroslav Lachman
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