RE: [xml] 2.5.x performance vs. 2.4.24

["Grant Goodale" <grant reactivity com>]

        I require thread support, so recompiling without them isn't an
option.  Nevertheless, I got the same results after rebuilding without
thread support.  Any other thoughts?  Is there a public ftp site where I
can post the document for other people to try this?

        Another data point - the time between brk() calls in 2.4.24
while running this test is approx. 7 ms.  In 2.5.8, it's approx. 100ms.
Have the built-in memory management functions changed much between the
two versions?

        Thanks, 
          G

-----Original Message-----
From: Daniel Veillard [mailto:veillard redhat com] 
Sent: Wednesday, August 13, 2003 12:34 AM
To: Grant Goodale
Cc: xml gnome org
Subject: Re: [xml] 2.5.x performance vs. 2.4.24


On Tue, Aug 12, 2003 at 06:59:56PM -0700, Grant Goodale wrote:
>       (I know there's at least one other thread on this, but I joined
the 
> list too late to get in on it.  Sorry.)
>
>       In comparing the aforementioned version of libxml2 (built from 
> tarballs on the same machine) I ran the following command:
>
>        xmllint --noout --timing --memory ~/foo.xml
>
> where foo.xml is a well-formed 3.5mb xml file, and got the following
> results:
>
> 2.4.24:
> Parsing took 327 ms
> Freeing took 52 ms
>
> 2.5.8:
> Parsing took 34013 ms
> Freeing took 114 ms
>
>       RH AS2.1, Dual P4 (Seen as 4 procs - yay HT), 2GB memory, kernel

> 2.4.9-e.25, glibc-2.2.4-32.3.  Anyone seen anything similar on large 
> documents?  strace shows a large number of calls to brk() taking up 
> most of the time:
>
> 18:55:33.594680 brk(0x8060000)          = 0x8060000
> 18:55:33.606823 brk(0x8061000)          = 0x8061000
> ---snip---
> 18:56:07.875950 brk(0x9209000)          = 0x9209000
> 18:56:07.876090 brk(0x920a000)          = 0x920a000

  I can't explain this. Try to configure without threads and rerun, but
without any reproducable example I never saw anything similar, and have
no idea what the problem is.

Daniel

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