Messages in this thread | | | Date | Mon, 18 Nov 2002 08:34:34 -0800 | From | "Martin J. Bligh" <> | Subject | Re: unusual scheduling performance |
| |
> On 16x, 2.5.47 kernel compiles take about 26s when the machine is > otherwise idle. > > On 32x, 2.5.47 kernel compiles take about 48s when the machine is > otherwise idle. > > When a single-threaded task consumes an entire cpu, kernel compiles > take 36s on 32s when the machine is idle aside from the task consuming > that cpu and the kernel compile itself. > > I suspect the scheduler, because cpu reporting in top(1) shows that a > two or more cpu-intensive tasks are concentrated on the same cpu, and > some long-lived tasks appear to be "bouncing" across cpus. If someone > with knowledge and/or expertise with respect to scheduling semantics > could look into this, I would be much obliged. Resolving this would > likely address many SMP and/or NUMA scheduling performance issues.
1. make -j <what?>
2. profiles?
3. Can you try the latest set of NUMA sched patches posted by Eric Focht?
M.
- 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/
| |