Hi, >>Is this phenomenon normal?Is there any idea about this problem? It's a known problem with tcmalloc (search on the ceph mailing). starting osd with "TCMALLOC_MAX_TOTAL_THREAD_CACHE_BYTES=128M" environnement variable should help. Another way, is to compile ceph with jemalloc instead tcmalloc (./configure --with-jemalloc ...) ----- Mail original ----- De: "YeYin" <eyniy@xxxxxx> À: "ceph-users" <ceph-users@xxxxxxxxxxxxxx> Envoyé: Lundi 17 Août 2015 11:58:26 Objet: tcmalloc use a lot of CPU Hi, all, When I do performance test with rados bench, I found tcmalloc consumed a lot of CPU: Samples: 265K of event 'cycles', Event count (approx.): 104385445900 + 27.58% libtcmalloc.so.4.1.0 [.] tcmalloc::CentralFreeList::FetchFromSpans() + 15.25% libtcmalloc.so.4.1.0 [.] tcmalloc::ThreadCache::ReleaseToCentralCache(tcmalloc::ThreadCache::FreeList*, unsigned long, + 12.20% libtcmalloc.so.4.1.0 [.] tcmalloc::CentralFreeList::ReleaseToSpans(void*) + 1.63% perf [.] append_chain + 1.39% libtcmalloc.so.4.1.0 [.] tcmalloc::CentralFreeList::ReleaseListToSpans(void*) + 1.02% libtcmalloc.so.4.1.0 [.] tcmalloc::CentralFreeList::RemoveRange(void**, void**, int) + 0.85% libtcmalloc.so.4.1.0 [.] 0x0000000000017e6f + 0.75% libtcmalloc.so.4.1.0 [.] tcmalloc::ThreadCache::IncreaseCacheLimitLocked() + 0.67% libc-2.12.so [.] memcpy + 0.53% libtcmalloc.so.4.1.0 [.] operator delete(void*) Ceph version: # ceph --version ceph version 0.87.2 (87a7cec9ab11c677de2ab23a7668a77d2f5b955e) Kernel version: 3.10.83 Is this phenomenon normal? Is there any idea about this problem? Thanks. Ye _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com _______________________________________________ ceph-users mailing list ceph-users@xxxxxxxxxxxxxx http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
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