[imp] Slowness with big mailboxes
Peter Farrow
PeterF@3d-computers.co.uk
Tue, 2 Oct 2001 10:40:20 +0100
Dear Paul,
I have set imp up on a Red Hat Linux machine (7.0 and 7.1) and found the
following information:
On Red Hat 7.0 running on a single PIII 650 machine with 256 Megs of RAM
takes a long time (>1 Min)to open a mailbox with 3000 or so messages in it,
On Red Hat 7.1 running on a Dual Celeron 366 machine with 512Megs RAM it
takes around 10 seconds to do the same thing.
So its either: Red Hat 7.1, RAM or twin CPUs that makes the difference for
me.
Notably, when connecting to a Micro$oft Exchange server it takes about 10x
as long than connecting to a real mail server running Solaris on an E4000
machine, even when the Mailboxes are of comparable complexity.
I know this isn't much help, but it gives you somewhere to start! An Imap
proxy moves the delay downstream and may not help as much as you need.
Regards
Peter Farrow
peterf@3d-computers.co.uk
Technical Director
3D computer Systems
www.3d-computers.co.uk
-----Original Message-----
From: Paul Fielding [mailto:paul@mainland.ca]
Sent: 01 October 2001 21:07
To: imp@lists.horde.org
Subject: Re: [imp] Slowness with big mailboxes
Quoting Jon Parise <jon@horde.org>:
> There's really no way around it at the moment. You might try
> looking at an IMAP proxy, such as Perdition:
But I guess my question is, no way around what?
It seems to me that it isn't just an 'accepted problem'. I'm experiencing a
slow down on big mailboxes, other people aren't. Obviously this means that
there should be something I can change in my system that should remedy the
situation. Perhaps an OS issue, perhaps an IMP issue, perhaps my hardware
simply isn't beefy enough and I need to upgrade it. (Just how much
horsepower
does IMP need to connect to a mailserver and server out big mailboxes
quickly?
Mine's a Pentium class box).
<shrug> I'm just trying to understand what the problem actually is...
regards,
Paul
--
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From: Alex Leverington <admin@networkessence.net>
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Subject: RE: [imp] Slowness with big mailboxes
I have found that 'chmod +t' the your mail direcotry in spool *greatly*
improves speed (ex: chmod +t /var/spool/mail)
I did this and it improved performance drastically. I'm not sure what it does
but I read it on a post once. I'm guess it sets some type of access priority or
does read-ahead caching or something. Nonetheless, it worked for me.
Regards,
Alex Leverington
Quoting Peter Farrow <PeterF@3d-computers.co.uk>:
> Dear Paul,
>
> I have set imp up on a Red Hat Linux machine (7.0 and 7.1) and found the
> following information:
>
> On Red Hat 7.0 running on a single PIII 650 machine with 256 Megs of RAM
> takes a long time (>1 Min)to open a mailbox with 3000 or so messages in it,
>
>
> On Red Hat 7.1 running on a Dual Celeron 366 machine with 512Megs RAM it
> takes around 10 seconds to do the same thing.
>
> So its either: Red Hat 7.1, RAM or twin CPUs that makes the difference for
> me.
>
> Notably, when connecting to a Micro$oft Exchange server it takes about 10x
> as long than connecting to a real mail server running Solaris on an E4000
> machine, even when the Mailboxes are of comparable complexity.
>
> I know this isn't much help, but it gives you somewhere to start! An Imap
> proxy moves the delay downstream and may not help as much as you need.
>
> Regards
>
> Peter Farrow
> peterf@3d-computers.co.uk
> Technical Director
> 3D computer Systems
>
> www.3d-computers.co.uk
> -----Original Message-----
> From: Paul Fielding [mailto:paul@mainland.ca]
> Sent: 01 October 2001 21:07
> To: imp@lists.horde.org
> Subject: Re: [imp] Slowness with big mailboxes
>
>
> Quoting Jon Parise <jon@horde.org>:
>
> > There's really no way around it at the moment. You might try
> > looking at an IMAP proxy, such as Perdition:
>
> But I guess my question is, no way around what?
>
> It seems to me that it isn't just an 'accepted problem'. I'm experiencing
> a
>
> slow down on big mailboxes, other people aren't. Obviously this means that
>
> there should be something I can change in my system that should remedy the
> situation. Perhaps an OS issue, perhaps an IMP issue, perhaps my hardware
> simply isn't beefy enough and I need to upgrade it. (Just how much
> horsepower
> does IMP need to connect to a mailserver and server out big mailboxes
> quickly?
> Mine's a Pentium class box).
>
> <shrug> I'm just trying to understand what the problem actually is...
>
> regards,
>
> Paul
>
> --
> IMP mailing list: http://horde.org/imp/
> Archive: http://marc.theaimsgroup.com/?l=imp&r=1&w=2
> Frequently Asked Questions: http://horde.org/faq/
> To unsubscribe, mail: imp-unsubscribe@lists.horde.org
>
>
> --
> IMP mailing list: http://horde.org/imp/
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> Frequently Asked Questions: http://horde.org/faq/
> To unsubscribe, mail: imp-unsubscribe@lists.horde.org
>
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>From scott@rainyday.ca Date: Tue Oct 2 6:20:21 2001
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Subject: solved - IMP logs me out immediately
I figured out what my problem was. The tables were not created in MySQL, although the database was. I re-ran the script (after commenting out the create database line) and now all is well.
I suppose more error checking could be included in the session logic to catch something like this, a corrupted or incorrectly set up database.
The FAQ maintainer should update the faq (5.3.9) because it has this question in it but the answer doesn't make any sense.
thanks, all...
st
Scott Toderash
Rainy Day Software Corp.