Updated Clang static analysis results / Valgrind update

Frédéric Delanoy frederic.delanoy at gmail.com
Sun Jul 3 08:33:56 CDT 2011

2011/7/3 Vincas Miliūnas <vincas.miliunas at gmail.com>:
>> On Sun, Jul 3, 2011 at 04:15, Austin English <austinenglish at gmail.com <http://www.winehq.org/mailman/listinfo/wine-devel>> wrote:
>> >/ Web space usage was getting a bit high, so I've uploaded a tarball to
>> />/ a file download service:
>> />/ http://www.sendspace.com/file/5hot36
>> />/
>> />/ austin at aw21 <http://www.winehq.org/mailman/listinfo/wine-devel> ~ $ sha1sum scan-build-2011-07-02.tar.bz2
>> />/ ac3cb3920ef97641fff1f5376f8136cef01f15bf  scan-build-2011-07-02.tar.bz2
>> /
>> FWIW, you could use xz instead of bzip2 to further reduce the download
>> size (54 MiB)
>> I got the size down to 46 MiB using default settings, and 25 MiB using
>> max compression (xz -9)
>> Frédéric
> I have heard about he xz compressor, so I was interested on how 7zip and xz perform maxed-out:
> 7z a -t7z -m0=lzma -mx=9 -mfb=255 -md=256m -ms=on scan-build-2011-07-02-1.7z scan-build-2011-07-02-1
> 11.87MiB - 12445530 scan-build-2011-07-02-1.7z
> xz -zkc -Fxz -9e -M5GB --lzma2='dict=256Mi,nice=273,mf=bt4' scan-build-2011-07-02-1.tar > scan-build-2011-07-02-1.xz
> 12.14MiB - 12726004 scan-build-2011-07-02-1.xz
> I didn't measure time, but it wasn't very long; xz took longer, because it doesn't support multithreading. Both required 3.5GB of memory at the peek.

Well I didn't use all the xz options TBH... I only have 4 GiB of RAM, so...
With "xz -9" it used like 600 MiB memory.

Don't know about 7z, but xz manpage says it requires 5-20% RAM for
decompression compared to compression, so it maybe a bit (too) high
with your options for certain people.

I once did a (quick) comparison between rzip/lrzip (which I think is
in the same family as 7z) and xz, and had comparable results (give ot
take 1% or 2), but xz was WAY quicker (something like 7-8x).
xz was about a quick (or quicker) than bzip2 with better compression
ratios/less memory usage, so it seemed a good compromise

You probably have a monster machine if it didn't take very long for
you though ;)


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