[nycbug-talk] make -jN performance
Thu Jan 20 11:59:45 EST 2005
On Jan 19, 2005, at 5:34 PM, Pete Wright wrote:
> hmm...then it looks like I should submit a PR to the doc team
> atleast it was an interesting exercise :)
Yeah- I wanted to pipe in quicklike with this one with some super-crude
Basically I've been compiling a lot of FreeBSD jails lately, so what
the hey, I've thrown in some -j flags informally to see what happens,
here's my results:
Single CPU (crufty old office 800mhz PIII):
- No flags, make world takes 49 min average.
- j2, j4, j6, j10, all take 50 min average.
Dual CPU (new-ish Dual Xeon 2.6mhz, under other server load):
- No flags, make world takes 22 min average.
- j2, j4, j6, j10, all take about 12 min average. (NICE.)
Lots of other stuff could affect my results here, but in a nutshell, it
seems that the j flag has no effect unless there's more than 1
That stated, I'd think that in my scripted jail-build stuff, it would
be worth my time to throw a -j4 flag in there, as it doesn't seem to
hurt much, and what the hey- the systems may port to 4 cpu machines in
the not-too-distant future...
Reporting from the Why-the-heck-not Dept.,
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