On Thu, Jun 30, 2011 at 4:38 AM, Alexander Dalloz <ad+li...@uni-x.org>wrote:
> Am 30.06.2011 08:36, schrieb Steve Barnes: > >> Although it would really be interesting to me to see scheduler settings > that would indeed allow something of a 'privileged' ssh or an OOB console > that would be responsive even under a punishing load with lots of swapping, > which is what the OP originally asked about. > > > > I'd be interested to hear thoughts on this. We have a small 1U test > server with 2 entry-level SATA drives that was brought to its knees twice > this week by an overzealous Java process. Load averages were up around 60+ > and as a result, SSH access would timeout. I don't know if this behaviour is > typical across operating systems, but it's frustrating to find yourself > locked out a server just because a single process went to town on the i/o > subsystem. > > > > Cheers > > > > Steve > > CentOS 6 will support cgroups, by which you can control cpu, memory and > I/O. > > http://www.mjmwired.net/kernel/Documentation/cgroups.txt > > http://www.mjmwired.net/kernel/Documentation/cgroups/blkio-controller.txt Just tried the disktop.stp script on a Linux 2.6.38 and it looks nice. The possibilities! :) http://sourceware.org/systemtap/examples/io/disktop.stp -- Giovanni Tirloni
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