Maximum Processing Attempts
MailScanner at ecs.soton.ac.uk
Mon Apr 27 22:40:16 IST 2009
Can someone test this please? How much of a difference does it really make?
It is a few small SQL operations per message on a very fast lightweight
(if any SQL server is lightweight!) database that will be in memory
anyway. I have specifically switched off fsyncs when it writes to the
database, so it shouldn't result in any appreciable disk i/o at all.
Should I leave it switched on by default, so heavily loaded sites can
switch it off to gain that extra bit of performance, at the cost of a
potential reliability hit?
If we go for that, can someone please edit the "optimising tips" wiki
page for me?
P.S. Have you seen I am on twitter too these days? You too can get to
see my inane ramblings at twitter.com/JulesFM.
On 27/04/2009 22:24, Christiaan den Besten wrote:
> Does it realy hit performance noticably? ..... in normal behaviour the
> database is extremly small .... so it should probably always live in
> disk-cache. And if people want to be sure, they can place it on tmpfs,
> doesn't hurt if it gets lost :)
> We have seen 'our share of broken messages' that trashed some of our
> servers, .... would have loved to have had the processing database
> back then :) :)
> ----- Original Message ----- From: "Julian Field"
> <MailScanner at ecs.soton.ac.uk>
> To: "MailScanner discussion" <mailscanner at lists.mailscanner.info>
> Sent: Sunday, April 26, 2009 20:28
> Subject: Maximum Processing Attempts
>> Please can someone add an entry into the wiki about this
>> MailScanner.conf option and its compatriot "Processing Attempts
>> As requested, I'm going to make this option disabled by default, as
>> it has a speed impact, so people need to know it exists if they get
>> any messages that kill MailScanner and therefore need to enable it.
>> Unless people think I should leave it enabled of course... (your
>> votes are welcome)
>> Many thanks!
>> Julian Field MEng CITP CEng
>> Buy the MailScanner book at www.MailScanner.info/store
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>> Contact me!
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Buy the MailScanner book at www.MailScanner.info/store
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