From: Mark Mitchell <mark@codesourcery.com>
To: Jan Hubicka <hubicka@ucw.cz>
Cc: law@redhat.com, gcc@gcc.gnu.org
Subject: Re: GCC Status Report (2004-09-13)
Date: Tue, 14 Sep 2004 17:07:00 -0000 [thread overview]
Message-ID: <414711BE.30408@codesourcery.com> (raw)
In-Reply-To: <20040914154104.GT378@atrey.karlin.mff.cuni.cz>
Jan Hubicka wrote:
>>Jeffrey A Law wrote:
>>
>>
>>
>>>On Mon, 2004-09-13 at 17:05, Mark Mitchell wrote:
>>>
>>>September 19
>>>
>>>
>>>* General compile-time performance improvements [Weinberg]
>>>
>>>Q. Presumably we can still also attack memory consumption
>>> issues as well. Right?
>>>
>>>The reason I ask is I have the first in what I expect will
>>>be a series of patches to start reducing memory consumption
>>>and bring more sense to our data structures.
>>>
>>>
>>>
>>>
>>Yes. We have a pretty good sense that reducing memory usage correlates
>>with reducing compile time, and, of course, people do not infinite RAM
>>anyhow, so this is a resource we should use prudently. The biggest
>>caveat is the one you have been raising recently: that touching pages
>>merely for the purpose of marking memory as free is by no means always a
>>win. But, if you can make data structures smaller in the first place,
>>and just allocate less along the way, that's going to help.
>>
>>So, yes, this is OK -- but please do use your judgement about the
>>prudence of attempting major overhauls. The smaller the change (whether
>>in terms of lines of code or in terms of conceptual complexity) the
>>better, naturally.
>>
>>
>
>Thanks.
>Just for a record - we consume roughly 4 times as much memory as 3.4 did
>for common C sources. Even tought we are down from 7 times we did week
>ago, this is still major regression.
>
I definitely agree.
--
Mark Mitchell
CodeSourcery, LLC
(916) 791-8304
mark@codesourcery.com
next prev parent reply other threads:[~2004-09-14 15:44 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-09-14 0:30 Mark Mitchell
2004-09-14 1:14 ` Andrew Pinski
2004-09-14 1:28 ` Jan Hubicka
2004-09-14 5:02 ` Jeffrey A Law
2004-09-14 5:58 ` Mark Mitchell
2004-09-14 6:29 ` Jeffrey A Law
2004-09-14 15:54 ` Jan Hubicka
2004-09-14 17:07 ` Mark Mitchell [this message]
2004-09-14 6:28 ` Mark Mitchell
2004-09-15 21:25 ` Scott Robert Ladd
2004-09-16 21:58 ` Mark Mitchell
2004-09-16 15:58 ` GCC Status Report (2004-09-13) [--enable-mapped-location] Per Bothner
2004-09-16 18:45 ` Mark Mitchell
2004-09-16 18:56 ` Per Bothner
2004-09-16 19:02 ` Mark Mitchell
2004-09-16 19:03 ` Matt Austern
2004-09-16 19:31 ` Mark Mitchell
2004-09-16 22:50 ` Steven Bosscher
2004-09-16 19:28 ` Per Bothner
2004-09-16 19:46 ` Mark Mitchell
2004-09-14 4:48 GCC Status Report (2004-09-13) Wolfgang Bangerth
2004-09-18 11:02 Paolo Bonzini
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