[pacman-dev] Paralellising integrity checks

[Nezmer]

On Sat, Feb 19, 2011 at 01:13:22PM +0200, Nezmer wrote:
> On Sat, Feb 19, 2011 at 04:26:56AM -0500, Tavian Barnes wrote:
> 
> snip
> 
> > - There's no portable way to get the number of available cores.  Where
> > does platform-specific code go in libalpm?  The way to do it on Linux
> > is with sched_getaffinity(); sysconf(_SC_NPROCESSORS_ONLN) is almost
> > as good and works on BSD too I believe.
> > 
> 
> No, I don't think it works on BSDs.
> 

Actually, The sysconf() method  works at least in FreeBSD and the man page
says the sysconf interface is defined by POSIX.1

> You can look at how x264 guys implemented this. Check out
> x264_cpu_num_processors() in common/cpu.c in their source tree.
> 
> I'm not sure hard-coding supported platforms through ifdefs would be
> accepted in pacman/libalpm.
> 
> > Also, I guess a major question would be: would this be likely to be
> > merged?  It's not a major issue, but it's also not a very large
> > change.  Every time there's a KDE update or something similarly large
> > I find myself wishing that all 2/4/24 of my cores were being used for
> > the the integrity checks.
> > 
> > -- 
> > Tavian Barnes
> > 
>