At 1:47 PM -0700 10/13/06, Kent Stewart 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.
You might want to repeat those performance tests. The results will
change over time, as various system changes are made. I used to see
results somewhat similar to yours, but the last time I checked I
seemed to get the best results from a dual-cpu system when using -j3 .
I believe that change in performance is due to some improvements
made to the `make' command itself, which solved some delays that
happened when -j was used. However, I do not remember the details.
Performance comparisons like this will also depend on all the hardware
on the system, and not just the dual-CPU. It can change depending on
much memory the machine has, for instance, or how fast the disks are
compared to the CPU's.
--
Garance Alistair Drosehn = [EMAIL PROTECTED]
Senior Systems Programmer or [EMAIL PROTECTED]
Rensselaer Polytechnic Institute; Troy, NY; USA
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