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From: John Baldwin <jhb@freebsd.org>
To: Rui Paulo <rpaulo@freebsd.org>
Subject: Re: svn commit: r278433 - in head: . contrib/xz contrib/xz/src/common
 contrib/xz/src/liblzma contrib/xz/src/liblzma/api
 contrib/xz/src/liblzma/api/lzma contrib/xz/src/liblzma/check
 contrib/xz/src/liblz...
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On Monday, February 09, 2015 06:20:35 AM Rui Paulo wrote:
> Author: rpaulo
> Date: Mon Feb  9 06:20:34 2015
> New Revision: 278433
> URL: https://svnweb.freebsd.org/changeset/base/278433
> 
> Log:
>   Merge xz 5.2.0.
> 
>   This brings support for multi-threaded compression.  This brings close
>   N times faster compression where N is the number of CPU cores.
>   Because of this, liblzma now depends on libthr.
> 
>   Soon libarchive will be modified to use the new lzma API.
> 
>   Thanks to antoine@ for the exp-run.

It looks like this uses hw.ncpu to determine the number of cores.  Can you 
make this cpuset friendly by querying the current process's CPU mask and 
counting the cores it contains instead?

Somethign like:

    cpuset_t set;

    cpuset_getaffinity(CPU_LEVEL_WHICH, CPU_WHICH_PID, -1, &set, sizeof(set));

(I have a CPU_COUNT() macro I should commit that will then let you do:)

    ncpus = CPU_COUNT(&set);

-- 
John Baldwin