[Bf-committers] [Bf-blender-cvs] [26206] Compiling issue

Erwin Coumans erwin.coumans at gmail.com
Sat Jan 23 22:06:33 CET 2010

Have you tried the very fast and popular Doug Lea Malloc, or dlmalloc?



On 23 January 2010 10:49, Campbell Barton <ideasman42 at gmail.com> wrote:
> did you try one of the malloc replacements? - should be able to do it
> without rebuilding blender even.
> I tried 3 popular malloc replacements (benchmarked with the game engine)
> jemalloc, nedmalloc and hoard IIRC None made much of a difference for
> me though perhaps the  BGE isnt a good test case, was also trying on
> linux with an optimized build.
> On Sat, Jan 23, 2010 at 5:21 PM, joe <joeedh at gmail.com> wrote:
>> This is also something I've had to deal with in the bmesh branch, and
>> the code I wrote there should never see the light of day in trunk
>> (which motivates me to tackle this now :) ).  It's really quite
>> horrible what I wrote to deal with vgroups performance problems.
>> Joe
>> On Sat, Jan 23, 2010 at 8:20 AM, joe <joeedh at gmail.com> wrote:
>>> The purpose was simple experimentation, since we need to do
>>> *something* and at the time I didn't think people would go for using
>>> jcmalloc.  Vgroups really are a bad source of performance loss, mostly
>>> in debug builds (which we need to be usable but aren't in some cases).
>>>  I was hoping to elicit ideas from other people, and go from there.
>>> Anyway, it was silly of me to ignore the possibility of using
>>> jcmalloc, which we can probably drop in as a replacement for malloc
>>> within guardedalloc itself (and even have compile time options to have
>>> guardedalloc go straight through to jcmalloc).
>>> Joe
>>> On Sat, Jan 23, 2010 at 6:53 AM, Brecht Van Lommel <brecht at blender.org> wrote:
>>>> Hi Joe,
>>>> Right, I replied to the wrong mail, I was talking about the
>>>> guardedalloc changes. I understand this is experimental, but I don't
>>>> think some more experimentation will be prove this to be the right
>>>> thing to do. It may well lead to a speedup in simple test cases, but a
>>>> simple use of pooling can lead to much wasted memory and make problems
>>>> worse when running Blender for a while. So it is not clear to me what
>>>> the purpose is here, if this is the start of writing an advanced
>>>> memory allocator then I don't think we should try to do that
>>>> ourselves, and if not then I don't think this can be good enough to
>>>> put in a release.
>>>> Brecht.
>>>> On Sat, Jan 23, 2010 at 3:19 PM, joe <joeedh at gmail.com> wrote:
>>>>> What are you talking about specifically?  It helps with ghash, because
>>>>> each bucket node was being allocated individually, causing a
>>>>> significant speed problem.  This particular solution was very
>>>>> appropriate; it's why we have the mempool library in the first place.
>>>>> Now, the experimental code I committed (#ifdef'd out) to guardedalloc
>>>>> is different (and was a
>>>>> different commit even).  This particular commit has nothing to do with
>>>>> that.  On that topic, OSX has (or had, anyway) a reputation for having
>>>>> a system allocator almost as slow as windows; linux is the only OS as
>>>>> far as I know (other then the BSDs I guess) that doesn't suffer from
>>>>> this.  So it's hardly simply a windows issue.
>>>>> The overhead we get from guardedalloc isn't all that bad, really.  I
>>>>> wasn't talking about that in the slightest.  What I was talking about
>>>>> was the significant performance loss we get from overusing the system
>>>>> allocator, which has caused significant problems for me and others.  I
>>>>> committed the code #ifdef'd out, so people who need it can play around
>>>>> with it but not cause problems for others.  There's a reason it's
>>>>> *experimental*.
>>>>> Joe
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> --
> - Campbell
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