Hello PaulNM,
PaulNM wrote:
Hey folks,
I'm wondering if anyone has experimented with different values for
MAKEOPTS="-jx" on Athlon 64 X2's. The guides usually suggest # of
cores/processors plus one. Looking at "man make.conf" doesn't help
much, it just says "Suggested settings are between CPUs+1 and
2*CPUs+1". The only thing "man make" mentions about the "-j" option
is "If the -j option is given without an argument, make will not
limit the number of jobs that can run simultaneously." I've also seen
some mentions of -j9 by people with dual core systems elsewhere,
indicating it drastically speed up some emerges.
So this leaves me with several possibilities. There's -j3 (current
setting), -j5, -j (no limit), -j9, or some other random number. Any
suggestions/warnings/links would be appreciated.
Thanks,
PaulNM
On my 4x Dual-Core Opteron system, -j9 actually worked as expected, but
not as much on the other system with two CPUs.
Is that what you want?
Here is the story.
The value of MAKEOPTS including -jx is passed to the `make' command so
that x kid jobs at most can be executed. If 1+#CPU is given as the
parameter, each CPU is assigned a single kid process because make
command itself does have much to do while the kids are working hard.
Giving the larger number just let them do extra job to switch among kids
in expense of performance down.
te
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