hi, cephers:
Now, I want to reduce the cpu usage rate by osd in full ssd
cluster. In my test case, ceph run out of cpu, the cpu idle is about
10%.
The cpu in my cluster is Intel(R) Core(TM) i5-4570 CPU @ 3.20GHz.
Can you give me some suggestion?
Thanks.
There are the cpu usage rate by perf tools.
+ 5.46% ceph-osd libtcmalloc.so.4.1.0 [.] 0x0000000000017dea
+ 2.45% ceph-osd libtcmalloc.so.4.1.0 [.]
tcmalloc::ThreadCache::ReleaseToCentralCache(tcmalloc::ThreadCache::FreeList*,
unsigned long, int)
+ 1.81% ceph-osd libc-2.12.so [.] memcpy
+ 1.75% ceph-osd libpthread-2.12.so [.] pthread_mutex_trylock
+ 1.66% ceph-osd [kernel.kallsyms] [k] _raw_spin_lock
+ 1.49% ceph-osd libtcmalloc.so.4.1.0 [.] operator delete(void*)
+ 1.47% ceph-osd libpthread-2.12.so [.] pthread_mutex_unlock
+ 1.14% ceph-osd libstdc++.so.6.0.13 [.] std::basic_string<char,
std::char_traits<char>, std::allocator<char>
>::basic_string(std::string const&)
+ 1.13% ceph-osd libc-2.12.so [.] _IO_vfscanf
+ 1.10% ceph-osd ceph-osd [.] ceph::buffer::ptr::release()
+ 1.09% ceph-osd libc-2.12.so [.] vfprintf
+ 1.00% ceph-osd [kernel.kallsyms] [k] page_fault
+ 0.96% ceph-osd ceph-osd [.]
ceph::buffer::list::append(char const*, unsigned int)
+ 0.94% ceph-osd ceph-osd [.] Mutex::Lock(bool)
+ 0.91% ceph-osd libstdc++.so.6.0.13 [.] 0x000000000008095f
+ 0.90% ceph-osd libstdc++.so.6.0.13 [.]
std::string::compare(std::string const&) const+ 0.88% ceph-osd
[vdso] [.] 0x0000000000000a08+ 0.87% ceph-osd
ceph-osd [.]
__gnu_cxx::__enable_if<std::__is_char<char>::__value, bool>::__type
std::operator==<char>(std::basic_string<char, std::char_traits<char>,
std::alloca+ 0.86% ceph-osd libstdc++.so.6.0.13 [.]
std::basic_string<char, std::char_traits<char>, std::allocator<char>
>::~basic_string()+ 0.76% ceph-osd [kernel.kallsyms] [k]
system_call+ 0.75% ceph-osd libstdc++.so.6.0.13 [.]
std::basic_ostream<char, std::char_traits<char> >&
std::__ostream_insert<char, std::char_traits<char>
>(std::basic_ostream<char, std::char_traits<cha
+ 0.73% ceph-osd libstdc++.so.6.0.13 [.]
std::basic_streambuf<char, std::char_traits<char> >::xsputn(char
const*, long)
+ 0.73% ceph-osd ceph-osd [.]
ceph::buffer::ptr::ptr(ceph::buffer::ptr const&)
+ 0.71% ceph-osd [kernel.kallsyms] [k] try_to_wake_up
+ 0.70% ceph-osd ceph-osd [.]
std::less<ghobject_t>::operator()(ghobject_t const&, ghobject_t
const&) const
+ 0.67% ceph-osd [kernel.kallsyms] [k] copy_user_enhanced_fast_string
+ 0.63% ceph-osd libc-2.12.so [.] __strlen_sse42
+ 0.61% ceph-osd [kernel.kallsyms] [k] update_curr
+ 0.60% ceph-osd libstdc++.so.6.0.13 [.]
std::ostreambuf_iterator<char, std::char_traits<char> >
std::num_put<char, std::ostreambuf_iterator<char,
std::char_traits<char> > >::_M_insert_int<l
+ 0.58% ceph-osd libtcmalloc.so.4.1.0 [.] operator new(unsigned long)
+ 0.58% ceph-osd libtcmalloc.so.4.1.0 [.]
tcmalloc::CentralFreeList::FetchFromSpans()
+ 0.55% ceph-osd ceph-osd [.]
ceph::buffer::ptr::append(char const*, unsigned int)
+ 0.55% ceph-osd libstdc++.so.6.0.13 [.] std::ostream&
std::ostream::_M_insert<long>(long)
+ 0.53% ceph-osd ceph-osd [.] ceph::log::Log::flush()
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