> From: Sam Varshavchik <[EMAIL PROTECTED]>
> Re: pop3d performance
> 2002-04-03 14:11
>
> Mark Lehrer writes:
>
> > > I have a question about the pop3 server; I have been using Courier
> > for awhile and I have several users who unfortunately like to leave
> > their mail on the server for 7 days.
> > > The problem I have is that it appears that the pop3 server is reading
> > the contents of every email... when you have 3 users simultaneously
> > reading 100 megabytes of mail every 5 minutes, it leads to significant
> > degradation of performance on the server.
>
> Certain POP3 commands require the entire mailbox to be rescanned.
just look at pop3dserver.c:
/*
** The RFC is pretty strict in stating that octet size must count the CR
** in the CRLF endofline.
*/
static void calcsize(struct msglist *m)
{
...
}
this will surely lead to significant degradation of performance...
i have a "quick and dirty" (but efficient) patch for this. contact me
since i don't want to pollute the mailing-list with patches that will
not make it into mr sam's code :)
can't this be cached somehow ? i have a proposal for caching, which
would not break anything regarding the RFCs :) for this again you can
contact me...
>
> > My key reason for making the switch to Maildirs was to avoid this kind
> > of thrashing. Has anyone else run into this? Is there a setting in
> > pop3d that I can use to have it only read the headers, or does pop3
> > have to read the complete contents?
>
> You're using the wrong tool for the job. POP3 is not designed for
> hundred-megabyte mailboxes. That's what IMAP's for. POP3's purpose is to
> serve as a means to download mail from an external mailbox, and that's it.
>
> --
> Sam
but there are strange people out there that we call "customers" and who
buy POP3 access :) and since customers are users they -sometimes- forget
to pop their mails... and this is not a reason for sending servers in
space...
--
Olivier
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