From: Qi Lu <qi.lu@...>
Date: 2009-05-11T22:23:01+09:00
Subject: Re: Too many open files

Roger Pack wrote:
>> Windows XP has a limit of 255 files opened by any process, including
>> stdin, stdout and stderr. I googled for how to increase the limit, and
>> have not found a solution other than:
> 
> A few things since I ran into this problem before:
> msvcrt 6 (ruby's default) has a limit of 512.  Ruby itself "duplicates" 
> fd objects when created, so that it can have the "original" and a more 
> "linuxy" equivalent (I think that's why--it explains it more in the 
> source I just glanced at it once). So with msvcrt 6 and ruby you're 
> limited at 512.

Thank you very much for your reply. It makes me understand the limit. 
But why do I have only 256 limit not even 512? I use Ruby 1.8.6 version 
and run on XP. If I can make my limit to 512, it will help little bit.

> 
> That being said, be *very* aware that select calls are limited to 64 
> sockets MAX.  So even though you can open 256, don't use more than 64 
> ever ever ever.  Though I suppose now that we have Ruby 1.9 (have as 
> in...it compiles [1]) you could use multiple threads, and, per thread 
> pass in 64.  I think that would get around that one limitation--I think 
> :)
> Actually it *might* be possible to through them all into a single select 
> (single threaded), thanks to Usaku Nakamura's fixing this bug [1].


Since my application is not that time critical, I use a single thead to 
do the select. and slice all sockets into multiple a group of 64 i/o 
array. I have got around of 64 limit. my problem is realy 256 max open 
file limit. What I can do to make it at least 512?

Thanks

Qi
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