On Tue, Jul 03, 2001 at 12:25:12PM -0600, Sasha Pachev wrote:
> Hi,
>
> I have observed a rather strange behaviour doing a multi-threaded CPU
> benchmark on an 8-way machine running 2.4.2 SMP kernel. Even when the
> priority is reniced to the highest possible value, I am still unable to reach
> more than 50% CPU utilization. My benchmark just creates a bunch of threads
> with pthread_create(), and then runs a simple integer computation in each
> thread. On a dual with 2.4.3 kernel, and a 4-way with 2.4.2 kernel, I am able
> to reach full CPU utilization.
I haven't had any problem fully utilizing 8 CPUs on 2.4.* kernels. This
may seem obvious, but do you have more than 4 CPUs worth of work for the
system to do? What is the runqueue length during this benchmark?
-- Mike Kravetz mkravetz@sequent.com IBM Linux Technology Center - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Sat Jul 07 2001 - 21:00:12 EST