Hi! > >> +nr_cpus=$NR_CPUS > >> +nr_mems=$N_NODES > >> > >> # In general, the cache hog will use more than 10000 kb slab space on > >> the nodes > >> # on which it is running. The other nodes' slab space has littler > >> change.(less > >> @@ -231,7 +231,7 @@ general_memory_spread_test() > >> fi > >> > >> # wait for droping the cache > >> - sleep 10 > >> + sleep 20 > > I've asked our kernel guys and the drop_caches is synchronous interface, > > so at the time the cat returns the caches should be dropped. See > > fs/drop_caches.c the sysctl handler just does the work, there is nothing > > deffered to working threads. > > > > What exactly goes wrong when this sleep is missing here? > > If I remove this sleep and perform two sequential runs I get this error: > root@debian7-x64:/opt/ltp/testcases/bin# ./cpuset_memory_spread_testset.sh > 100+0 records in > 100+0 records out > 104857600 bytes (105 MB) copied, 0.0595533 s, 1.8 GB/s > cpuset11 1 TFAIL : hog the memory on the unexpected > node(FilePages_For_Nodes(KB): _0: 0 > _1: 336 > _2: 0 > _3: 0, Expect Nodes: 0). > > But if I take a few seconds between two runs the error disappears. > > I suppose this is an environment issue but don't know how to manage it.
Hmm, strange indeed, so it looks like the memory is allocated under wrong node. I would guess that there is someting wrong with the cpuset that moves the test process into the new set. Maybe the system needs some time to move the process memory to the node we specified. And I wasn't able to run the test yet, I've managed to get a machine with two real nodes but the cpuset tests are not easy to run :( -- Cyril Hrubis chru...@suse.cz ------------------------------------------------------------------------------ October Webinars: Code for Performance Free Intel webinars can help you accelerate application performance. Explore tips for MPI, OpenMP, advanced profiling, and more. Get the most from the latest Intel processors and coprocessors. See abstracts and register > http://pubads.g.doubleclick.net/gampad/clk?id=60133471&iu=/4140/ostg.clktrk _______________________________________________ Ltp-list mailing list Ltp-list@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/ltp-list
