On 10/13/06, Kent Stewart <[EMAIL PROTECTED]> wrote:
On Friday 13 October 2006 07:31, Buki wrote:
> Hi,
>
> I searched the archives and web a little but found many different
> opinions on stability/usability of using make -j# with buildworld
> (and buildkernel).
>
> So I am asking if it is a good idea to use make -j on production
> boxes.
>
I tested buildworlds with different values for -j. On single processors,
using a script that basically looked like
time make -j? ...
yielded fastest builds when I didn't specify a value for -j. On dual
cpu's a value around -j8 yielded the fastest build.
That's odd, your results don't jive with this:
http://people.freebsd.org/~fsmp/SMP/akgraph-a/graph1.html
Although that report is quite old... My general rule of thumb for -j
is n +1, where n equals the total number of cpu cores. This is
generally enough to keep to processor(s) occupied without over
stressing the system. Maybe n * 2 is more appropriate, can you post
the results from your test?
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