Messages in this thread | | | Date | Tue, 13 Apr 2004 00:55:47 -0700 | From | "Martin J. Bligh" <> | Subject | Re: Benchmarking objrmap under memory pressure |
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--Andrew Morton <akpm@osdl.org> wrote (on Tuesday, April 13, 2004 00:51:11 -0700):
> "Martin J. Bligh" <mbligh@aracnet.com> wrote: >> >> 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 ;)
Look at the cpu percentage though. I presume it's blocked itself on disk IO. Possibly because the space overhead of pte_chains causes more mem pressure.
> Average of five runs, please...
Maybe in the morning ;-). I mean ... a sensible time later this morning ;-)
M.
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