On Thu, 9 Aug 2001, Himanshu Kulkarni wrote:
> Thanks a lot ...
>
> I did not know about other mailing list. I have subscribed there as well ...
>
> Thanks for your reply. That clears my first doubt. However if you do not
> mind i have one more query. I will be glad if you answer that ... whenever
> the RAM available on server is less that 10MB i start getting unable to fork
> errors .... and I endup rebooting the server ....
Then you may be running out of file handles, or processes per user.
Try to look at /proc/sys/fs/file-nr, /proc/sys/fs/file-max
file-nr is of the format:
aaa bbb ccc
where aaa = peak usage of handles
bbb = current usage
ccc = max number of handles
if peak == max, then echo a number, redirect it to /proc/sys/fs/file-max
to increase the amount of file handles.
for number of processes, either limit the number of qmail deliver
processes or increase the ulimit variable to accomodate a greater num of
processes. You many need to recompile your kernel because afaik, the
stock setting of this is 512 processes per user.
a more general discussion appears in http://www.kegel.com/c10k.html
>
> We have already placed purchase order for Redhat linux 7.0 and will upgrade
> very soon ....
Redhat Linux's 7.0 compiler is UNSTABLE to use in production environments.
Either use Mandrake 8.0 or Redhat 7.1. For production use, if you want to
avoid heavily patching your older version distributions with security
updates, go with the latest.
>
> Thanks for suggestion .....
> ----- Original Message -----
> From: "Ian C. Sison" <[EMAIL PROTECTED]>
> To: <[EMAIL PROTECTED]>
> Cc: <[EMAIL PROTECTED]>
> Sent: Wednesday, August 08, 2001 10:03 PM
> Subject: [plug] Re: [ph-isp] Memory management on Linux
>
>
> >
> > Ok before i answer your question here are some tips:
> >
> > 1. you can get more expert advise if you post your question on the
> > philippine linux users group mailing list, and newbie list.
> >
> > To subscribe to the Linux Newbies' List: send "subscribe" in the body to
> > [EMAIL PROTECTED]
> >
> > 2. please don't send any html formatted mail onto mailing lists, it's very
> > annoying..
> >
> > ======================
> >
> > now for some helpful tips:
> >
> > 1. Your linux box is running a very old and VERY INSECURE version of
> > redhat linux (6.1). Unless you have updated your bind,lpd,wuftpd
> > packages among others, you are sure to be hacked in the near future.
> >
> > 2. Linux by design will use up ALL available memory for internal use of
> > buffers and cache (note the values under the words buffers/cache in the
> > dump of 'free' you posted). This behaviour enables linux to cache and
> > buffer disk i/o and keep everything residing in memory as long as
> > possible, for the fastest performance without having to go to disk for
> > files or data. This means, even if you have 2GB ram on your system, you
> > will still get the same usage pattern. As long as you dont see too much
> > swapping and the si/so values of the output of 'vmstat 5' remain at zero,
> > your servers fine.
> >
> >
> > On Wed, 8 Aug 2001, Himanshu Kulkarni wrote:
> >
> > > BlankHi I am running Qmail MTA on Linux 6.1 ... the kernel version is
> Linux 2.2.12-20 ..
> > >
> > > The configuration of this server is P3 with 256MB of RAM and 2*18.2GB
> HDD.
> > >
> > > on this server very frequently we have observed that the server is
> > > running out of memory, at times the available memory is as less as 4
> > > or 5 mb . However server never use swap. I am attaching the output of
> > > free command ....
> > >
> > > is there any known patch to fix this ...?? if any more inputs required
> > > from server I pl letus know we will send the info...
> > >
> > > total used free shared buffers
> cached
> > > Mem: 257728 250912 6816 8732 151780 74284
> > > -/+ buffers/cache: 24848 232880
> > > Swap: 1024088 1208 1022880
> > >
> > > total used free shared
> buffers cached
> > > Mem: 257728 251064 6664 9072 151780
> 74312
> > > -/+ buffers/cache: 24972 232756
> > > Swap: 1024088 1208 1022880
> > >
> > > total used free shared
> buffers cached
> > > Mem: 257728 250592 7136 8176 151780
> 74064
> > > -/+ buffers/cache: 24748 232980
> > > Swap: 1024088 1208 1022880
> > >
> > > total used free shared buffers
> cached
> > > Mem: 257728 251716 6012 9608 151780
> 74764
> > > -/+ buffers/cache: 25172 232556
> > > Swap: 1024088 1208 1022880
> > >
> > > total used free shared buffers
> cached
> > > Mem: 257728 250832 6896 9144 151780
> 74068
> > > -/+ buffers/cache: 24984 232744
> > > Swap: 1024088 1208 1022880
> > >
> > >
> > > regards
> > > himanshu
> > >
> > >
> > >
> >
> >
> >
> > _
> > Philippine Linux Users Group. Web site and archives at
> http://plug.linux.org.ph
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> >
> > To subscribe to the Linux Newbies' List: send "subscribe" in the body to
> [EMAIL PROTECTED]
> >
>
> _
> Philippine Linux Users Group. Web site and archives at http://plug.linux.org.ph
> To leave: send "unsubscribe" in the body to [EMAIL PROTECTED]
>
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>[EMAIL PROTECTED]
>
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