Re: lotsa lotsa lotsa FDs
Re: lotsa lotsa lotsa FDs
- Subject: Re: lotsa lotsa lotsa FDs
- From: email@hidden
- Date: Sat, 22 Apr 2006 01:54:07 -0700
Peter,
... so I figure i'm not doing it right. Is ulimit -n / -s not
enough? Can I do something else to allow for the thousands of
descriptors i'll be creating / using?
Have you set kern.maxfiles in sysctl?
Firstly, I appreciate the help! When I look at what kern.maxfiles is
set to, it says:
PugsleyButt:~ jmzorko$ sysctl -a|grep files
kern.maxfiles = 12288
kern.maxfilesperproc = 10240
PugsleyButt:~ jmzorko$
... which is way beyond what i'm trying (6000 connections, though I
eventually want to try 10K, 20K, 100K even). I wrote a quick Perl
script that makes n connections to a test C++ server I wrote (running
on another machine), and waits for data from each of those sockets.
I've tried this on wired (100mb/s) and wireless (54mb/s) networks,
and eventually the script will make my PowerBook exhibit the
following behavior:
1. I can't ctrl-C the Perl script (it hangs)
2. I can't kill the Perl script via the kill command (it hangs)
3. I can't check mail / use Safari / etc. (spinning beach ball
everywhere)
... sometimes it works (the Perl script comes back when the server
has finished sending everything), sometimes I can ctrl-C the Perl
script and it will be fine, but the more often I run it (with high #s
of connections it's creating to the server), the more likely it is to
exhibit the above behavior.
I first thought it was my kqueue() experiments going south, then I
tried rewriting the server to use the libEvent library (thinking it
will do the kqueue thing correctly), but it still did it, then I made
libEvent use poll() instead of kqueue, but it still did it, then I
put the server on another machine entirely, and just running the Perl
client makes the problem appear, so it seems to have something to do
with large (thousands) numbers of descriptors being active at once,
and nothing to do with kqueue / poll / libEvent. This is on a 12"
1.5ghz PowerBook G4, running 10.4.6, 1.25GB RAM.
Is there some other setting that I can tweak to make this problem go
away with large numbers of connections?
Regards,
John
Falling You - exploring the beauty of voice and sound
http://www.fallingyou.com
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