Intel Core Duo. SMP kernel but still only 50% load while
using make on ports...
daniel.tourde at spray.se
Thu Feb 8 22:04:01 UTC 2007
Thanks for your answer
> > I have at my disposal an Inspiron 9400 with an Intel Core FreeBSD
> > is installed and rebuilt to fit the processor. The kerne l is in SMP
> > I noticed something strange: When I compile using ma in the ports
> > tree, I only have 50% load. CPU1 is used at CPU0 is idle...
> How do you know this?
> > I tried make -j2 but it did not work, Any idea?
> -j2 does not guarantee that you'll use both CPUs. It's entirely possible
> that the IO is slow enough that both of the processes are waiting on disk
> and only able to push the overall system usage to 50%. Try make -j99.
> Also, there are places in the build process where it's only possible to
> run one process at a time, so you can't just take a single snapshot of
> it, you have to watch it over time.
I think it's more that the port tree does not really like parallel processes...
> I'm still not convinced anything is wrong:
> *) Does dmesg show the second CPU starting?
> *) Does top show a column for CPU binding? Are different processes bound
> to different CPUs?
> *) Are these hyperthreaded CPUs? If so, is hyperthreading enabled? HT is
> disabled by default on FreeBSD, and overall usage will never go above
> 50% if HT is off.
No, it's a Dual Core
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