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
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