Messages in this thread | | | Date | Thu, 2 May 2002 17:36:56 -0400 | Subject | O(1) scheduler gives big boost to tbench 192 | From | rwhron@earthlin ... |
| |
On an OSDL 4 way x86 box the O(1) scheduler effect becomes obvious as the run queue gets large.
2.4.19-pre7-ac2 and 2.4.19-pre7-jam6 have the O(1) scheduler.
At 192 processes, O(1) shows about 340% improvement in throughput. The dyn-sched in -aa appears to be somewhat improved over the standard scheduler.
Numbers are in MB/second.
tbench 192 processes 2.4.16 29.39 2.4.17 29.70 2.4.19-pre5 29.01 2.4.19-pre5-aa1 29.22 2.4.19-pre5-aa1-2g-hio 29.94 2.4.19-pre5-aa1-3g-hio 28.66 2.4.19-pre7 29.93 2.4.19-pre7-aa1 32.75 2.4.19-pre7-ac2 103.98 2.4.19-pre7-rmap13 29.46 2.4.19-pre7-jam6 104.98 2.4.19-pre7-rl 29.74
At 64 processes, O(1) helps a little. ac2 and jam6 have the highest numbers here too.
tbench 64 processes 2.4.16 101.99 2.4.17 103.49 2.4.19-pre5-aa1 102.43 2.4.19-pre5-aa1-2g-hio 104.30 2.4.19-pre5-aa1-3g-hio 104.60 2.4.19-pre7 100.86 2.4.19-pre7-aa1 101.76 2.4.19-pre7-ac2 105.89 2.4.19-pre7-rmap13 100.94 2.4.19-pre7-rl 99.65 2.4.19-pre7-jam6 108.23
I've seen some benefit on a uniprocessor box running tbench 32 for kernels with O(1). Hmm, have to try tbench 192 on uniproc and see if the difference is all scheduler overhead.
I'm putting together a page with more results on this machine. It will be growing at: http://home.earthlink.net/~rwhron/kernel/bigbox.html
-- Randy Hron
- 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/
| |