Messages in this thread | | | Date | Tue, 13 Apr 2004 17:38:02 -0700 | From | "Martin J. Bligh" <> | Subject | Re: Benchmarking objrmap under memory pressure |
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>> UP Athlon 2100+ with 512Mb of RAM. Rebooted clean before each test >> then did "make clean; make vmlinux; make clean". Then I timed a >> "make -j 256 vmlinux" to get some testing under mem pressure. >> >> I was trying to test the overhead of objrmap under memory pressure, >> but it seems it's actually distinctly negative overhead - rather pleasing >> really ;-) >> >> 2.6.5 >> 225.18user 30.05system 6:33.72elapsed 64%CPU (0avgtext+0avgdata 0maxresident)k >> 0inputs+0outputs (37590major+2604444minor)pagefaults 0swaps >> >> 2.6.5-anon_mm >> 224.53user 26.00system 5:29.08elapsed 76%CPU (0avgtext+0avgdata 0maxresident)k >> 0inputs+0outputs (29127major+2577211minor)pagefaults 0swaps > > A four second reduction in system time caused a one minute reduction in > runtime? Pull the other one ;) > > Average of five runs, please...
You're right - it's rather variable. Still doesn't look bad though.
2.6.5 Average elapsed = 6:11 224.92user 30.15system 5:44.19elapsed 74%CPU (0avgtext+0avgdata 0maxresident)k 225.04user 30.23system 6:02.49elapsed 70%CPU (0avgtext+0avgdata 0maxresident)k 225.28user 29.60system 5:48.22elapsed 73%CPU (0avgtext+0avgdata 0maxresident)k 225.81user 31.75system 6:42.38elapsed 64%CPU (0avgtext+0avgdata 0maxresident)k 225.23user 30.20system 6:40.48elapsed 63%CPU (0avgtext+0avgdata 0maxresident)k
2.6.5-anon_mm Average elapsed = 5:43 224.34user 25.43system 4:51.23elapsed 85%CPU (0avgtext+0avgdata 0maxresident)k 224.23user 25.93system 5:00.79elapsed 83%CPU (0avgtext+0avgdata 0maxresident)k 224.39user 26.36system 5:37.71elapsed 74%CPU (0avgtext+0avgdata 0maxresident)k 225.65user 27.13system 6:28.00elapsed 65%CPU (0avgtext+0avgdata 0maxresident)k 225.14user 27.26system 6:39.61elapsed 63%CPU (0avgtext+0avgdata 0maxresident)k
I've kicked off the -aa tree tests - will post them later tonight.
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