On Mon, Jan 07, 2013 at 11:25:47AM +1100, Trent W. Buck wrote:
> Craig Sanders <[email protected]> writes:
> > yeah, don't underestimate the usefulness of 'make -j' - multicore
>
> Note: trying this (without specifying a number) in a project like
> busybox, without ulimits, is a good way to fork-bomb yourself.
yep, 'make -j N' where N ~= the number of cpus/cores you want to use.
other useful tools to make full use of multi-core systems include
the -P or --max-procs option of xargs:
--max-procs=max-procs
-P max-procs
Run up to max-procs processes at a time; the default is 1. If
max-procs is 0, xargs will run as many processes as possible at
a time. Use the -n option with -P; otherwise chances are that
only one exec will be done.
depending on exactly what you're trying to do, this can result in
enormous speedups of 'find ... | xargs ...' and imilar common idioms.
and, of course, there is GNU parallel which can be used as a substitute
for xargs (the command line options are deliberately the same), or even
as a #!/usr/bin/parallel script.
craig
--
craig sanders <[email protected]>
BOFH excuse #267:
The UPS is on strike.
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