Messages in this thread | | | Date | Wed, 04 Feb 2009 19:38:22 -0600 | From | Robert Hancock <> | Subject | Re: Poor performance on cp on kernel 2.6.27.7-9-xen (openSUSE 11.1) |
| |
Michael Monnerie wrote: > And one last thing: > rsync -aPv /disk1/bigfile /disk2/xxx > That copies at max. 50MB/s, because 2 rsync tasks are started each > taking 50% of 1 CPU - why doesn't the kernel switch the 2nd task to > another CPU? There are 8 cpus in that system - 7 of them idle.
Usually in such cases it's because the tasks are piping data to each other in such a way that they can't both run at the same time. In this situation there is no point in moving one to another CPU because they're not executing concurrently anyway.
| |