Re: MAXFD is always 1024

On Mon, 2005-08-15 at 11:55 +0700, Hay Tran The wrote: 
>  I am using Redhat Linux ES 3.1
>  
> I have changed the maximum open files for OS by doing all three
> things:
> - Edit /etc/sysctl.conf, add fs.file-max = 32768 , then run #sysctl -p
> I can double check /proc/sys/fs/file-max and see this figure 32768
>  
> - run command #ulimit -n 32768
>  
> - Edit /usrusr/include/bits/typesizes.h and set 
> #define __FD_SETSIZE            32768
> 
>  
> Next, I re-complile web-polygraph. I can see below messages during
> "configure" is running:
>  
> "checking Default FD_SETSIZE value... 32768
> checking Maximum number of filedescriptors we can open... 1024"

The second message means that ./configure process cannot open more than
1024 file descriptors. Thus, whatever changes you made to increase the
number of file descriptors were not sufficient.

> After installation finished, I run polyctl and got below message:
> 
> "FDs: 1024 out of 1024 FDs can be used; safeguard limit: 983"
> 
>  
> I think web-polygraph can detect the FD_SETSIZE = 32768, but it still
> use 1024 as maximum number of open file.

Yes, because ./configure fails to oped more than 1024 files. Polygraph
does not trust FD_SETSIZE if it cannot actually open that many files.

> What do I have to do to increase the number of open file for
> Web-Polygraph?

It does not seem like a Polygraph-specific problem. You may want to
check individual user limits. Often, these limits prohibit users from
opening many files. Sometimes, running as root will raise the limit, but
not always; you may have to change user configuration. Whatever you do,
always watch out for ./configure output. It must be able to open
FD_SETSIZE file descriptors.

HTH,

Alex.