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Date: Tue, 9 Feb 2010 22:16:29 +0000
Message-ID: <5641883d1002091416m4b1f0210odf71c7a3054299@mail.gmail.com>
From: Oliver Charles <oliver.g.charles@googlemail.com>
To: Olly Betts <olly@survex.com>
Content-Type: text/plain; charset=ISO-8859-1
Cc: notmuch@notmuchmail.org
Subject: Re: [notmuch] Notmuch performance problems on OSX
Precedence: list

On Tue, Feb 9, 2010 at 10:09 PM, Olly Betts <olly@survex.com> wrote:
> On 2010-02-09, Oliver Charles wrote:
>> I just upgraded to xapian-core HEAD and notmuch master tip today, in
>> desparation to get away from GMail. Sadly it's still taking at least
>> 0.7s to tag a single thread (with one message). I'm really eager to
>> solve this, could anyone give me any pointers on how I could go about
>> profiling it or finding the cause of this problem?
>
> The first thing to try is disabling use of F_FULLFSYNC.  You'll need to
> run this command in the xapian-core source tree to comment out the F_FULLFSYNC
> code:
>
> perl -pi -e 's/^#ifdef F_FULLFSYNC/#if 0/' backends/*/*_io.h
>
> Then run "make" and "make install".

$ time notmuch tag +inbox thread:6e66368b7887184c6d4c63653211b3f2

real    0m0.067s
user    0m0.036s
sys     0m0.028s

Now this looks a little bit more usable!

> Assuming that helps, then (a) you have a workaround, and (b) we'll know for
> sure it is F_FULLFSYNC to blame.

Looks like this is the case.

> I've created a ticket for a change to Xapian which should help here, but
> not had a chance to work on it yet:
>
> http://trac.xapian.org/ticket/426

I will add my info there and follow the ticket if I can.

--
   Oliver Charles / aCiD2

(Olly, sorry about the double email - in all my excitement I didn't
hit reply all :))