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Re: intro
From: |
Sergey Poznyakoff |
Subject: |
Re: intro |
Date: |
Wed, 13 Mar 2002 17:11:38 +0200 |
> Is MMIO, Memory Map files? if yes we do that for Read-only files.
> But it turns out that the performance gain is relatively small
> for big files(lots of page fault) and most of the time the spool
> is on remote machine access across NFS.
On my server (which is now a bit short of RAM for its 5000 users)
I noticed considerable loss of performance and had to manually disable
mmapping. All pop3d daemons spent most of their time in
noninterruptible sleep on msync(), which is called from
mailbox_is_updated(). The latter is called before processing each
command, so the effect was terrible. That makes me think about
a special option to configure, say --disable-mmap.
Regards,
Sergey
- intro, xystrus, 2002/03/12
- Re: intro, Sergey Poznyakoff, 2002/03/12
- Re: intro, Alain Magloire, 2002/03/13
- Message not available
- Re: intro, xystrus, 2002/03/13
- Re: intro, Alain Magloire, 2002/03/13
- Re: intro,
Sergey Poznyakoff <=
- Message not available
- mailbox (was Re: intro), xystrus, 2002/03/13
- Re: mailbox (was Re: intro), Alain Magloire, 2002/03/13
- Re: mailbox (was Re: intro), Jeff Bailey, 2002/03/13
- Re: mailbox (was Re: intro), Alain Magloire, 2002/03/13
- Re: mailbox (was Re: intro), Sergey Poznyakoff, 2002/03/13
- Re: mailbox (was Re: intro), Alain Magloire, 2002/03/13
- Re: C/C++ (was Re: mailbox (was Re: intro)), Alain Magloire, 2002/03/13
- Re: C/C++ (was Re: mailbox (was Re: intro)), Nic Ferrier, 2002/03/13
- Re: C/C++ (was Re: mailbox (was Re: intro)), xystrus, 2002/03/13
- Re: mailbox (was Re: intro), Sam Roberts, 2002/03/13