From mboxrd@z Thu Jan  1 00:00:00 1970
From: ezyang@MIT.EDU (Edward Z. Yang)
Date: Wed, 3 Jun 2009 21:53:12 -0400 (EDT)
Subject: [sup-talk] Sup is hangingyy
In-Reply-To: <1244078482-sup-4986@javelin>
References: <1244050695-sup-5990@javelin> <1244053108-sup-4982@javelin>
	<1244064889-sup-9506@entry>
	<alpine.DEB.2.00.0906031758290.24343@javelin>
	<1244078482-sup-4986@javelin>
Message-ID: <alpine.DEB.2.00.0906032152200.6894@javelin>

On Wed, 3 Jun 2009, Edward Z. Yang wrote:
> The second is a large amount of CPU thrashing as Sup parses messages. This
> is something we can fix, and I hope to do some more poking to help make
> Sup run faster in this respect. The basic behavior is Sup repeatedly
> allocates some amount of memory, reallocates it twice (quadrupling it
> in size to about 4MB), deallocates, and then does it again. I'm running
> ruby-prof in hopes of tickling this again.  Unlike the hung IMAP server,
> this eventually finishes, but it is extremely obnoxious when it happens
> and blocks everything else. It commonly occurs when I open an email message.

Here we go:

http://web.mit.edu/~ezyang/Public/sup-performance.png

Look at String::=~. Definitely not acceptable.

Cheers,
Edward