Was the root cause found and fixed? If so, will the fix be available in 14.2.6 or sooner?
On Thu, Dec 19, 2019 at 5:48 PM Mark Nelson <mnelson@xxxxxxxxxx> wrote:
Hi Paul,
Thanks for gathering this! It looks to me like at the very least we
should redo the fixed_u_to_string and fixed_to_string functions in
common/Formatter.cc. That alone looks like it's having a pretty
significant impact.
Mark
On 12/19/19 2:09 PM, Paul Mezzanini wrote:
> Based on what we've seen with perf, we think this is the relevant section. (attached is also the whole file)
>
> Thread: 73 (mgr-fin) - 1000 samples
>
> + 100.00% clone
> + 100.00% start_thread
> + 100.00% Finisher::finisher_thread_entry()
> + 99.40% Context::complete(int)
> | + 99.40% FunctionContext::finish(int)
> | + 99.40% ActivePyModule::notify(std::string const&, std::string const&)
> | + 91.30% PyObject_CallMethod
> | | + 91.30% call_function_tail
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> | | + 88.40% PyEval_EvalFrameEx
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> | | | + 88.40% ceph_state_get(BaseMgrModule*, _object*)
> | | | + 88.40% ActivePyModules::get_python(std::string const&)
> | | | + 51.10% PGMap::dump_osd_stats(ceph::Formatter*) const
> | | | | + 51.10% osd_stat_t::dump(ceph::Formatter*) const
> | | | | + 22.50% ceph::fixed_u_to_string(unsigned long, int)
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> | | | | | | | | + 1.60% std::ctype<char> const& std::use_facet<std::ctype<char> >(std::locale const&)
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> | | | | | | | | | + 0.80% __cxxabiv1::__vmi_class_type_info::__do_dyncast(long, __cxxabiv1::__class_type_info::__sub_kind, __cxxabiv1::__class_type_info const*, void const*, __cxxabiv1::__class_type_info const*, void const*, __cxxabiv1::__class_type_info::__dyncast_result&) const
> | | | | | | | | + 1.40% bool std::has_facet<std::ctype<char> >(std::locale const&)
> | | | | | | | | | + 1.30% __dynamic_cast
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> | | | | | | | | + 1.10% bool std::has_facet<std::num_put<char, std::ostreambuf_iterator<char, std::char_traits<char> > > >(std::locale const&)
> | | | | | | | | | + 0.90% __dynamic_cast
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> | | | | | | | | | + 0.70% __dynamic_cast
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> | | | | | | | | | + 0.10% _ZNKSt6locale2id5_M_idEv@plt
> | | | | | | | | + 0.80% std::num_put<char, std::ostreambuf_iterator<char, std::char_traits<char> > > const& std::use_facet<std::num_put<char, std::ostreambuf_iterator<char, std::char_traits<char> > > >(std::locale const&)
> | | | | | | | | + 0.70% std::num_get<char, std::istreambuf_iterator<char, std::char_traits<char> > > const& std::use_facet<std::num_get<char, std::istreambuf_iterator<char, std::char_traits<char> > > >(std::locale const&)
> | | | | | | | | + 0.10% _ZSt9has_facetISt7num_putIcSt19ostreambuf_iteratorIcSt11char_traitsIcEEEEbRKSt6locale@plt
> | | | | | | | + 2.00% std::ios_base::_M_init()
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> | | | | | | | | + 0.80% std::locale::locale()
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> | | | | | | | | + 0.10% _ZNSt6localeC1Ev@plt
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> | | | | | + 2.80% std::ostream& std::ostream::_M_insert<unsigned long>(unsigned long)
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> | | | | | | | + 2.10% std::ostreambuf_iterator<char, std::char_traits<char> > std::num_put<char, std::ostreambuf_iterator<char, std::char_traits<char> > >::_M_insert_int<unsigned long>(std::ostreambuf_iterator<char, std::char_traits<char> >, std::ios_base&, char, unsigned long) const
> | | | | | | | | + 1.60% std::basic_streambuf<char, std::char_traits<char> >::xsputn(char const*, long)
> | | | | | | | | | + 1.40% std::basic_stringbuf<char, std::char_traits<char>, std::allocator<char> >::overflow(int)
> | | | | | | | | | | + 0.90% std::string::reserve(unsigned long)
> | | | | | | | | | | + 0.10% std::basic_stringbuf<char, std::char_traits<char>, std::allocator<char> >::_M_sync(char*, unsigned long, unsigned long)
> | | | | | | | | | | + 0.10% _ZNSt15basic_stringbufIcSt11char_traitsIcESaIcEE7_M_syncEPcmm@plt
> | | | | | | | | | + 0.20% __memcpy_ssse3_back
> | | | | | | | | + 0.20% ???
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> | | | | | | | + 0.10% _ZNKSt7num_putIcSt19ostreambuf_iteratorIcSt11char_traitsIcEEE13_M_insert_intImEES3_S3_RSt8ios_basecT_@plt
> | | | | | | + 0.10% std::ostream::sentry::sentry(std::ostream&)
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> | | | | | + 0.10% _ZNKSt15basic_stringbufIcSt11char_traitsIcESaIcEE3strEv@plt
> | | | | + 18.20% PyFormatter::open_object_section(char const*)
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> | | | | + 0.10% tc_free
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> | | | | + 0.10% std::_Rb_tree_increment(std::_Rb_tree_node_base const*)
> | | | | + 0.10% pow2_hist_t::dump(ceph::Formatter*) const
> | | | | + 0.10% objectstore_perf_stat_t::dump(ceph::Formatter*) const
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> | | | | + 0.10% PyFormatter::dump_pyobject(char const*, _object*)
> | | | + 21.80% Mutex::lock(bool)
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> | | | | + 21.80% __lll_lock_wait
> | | | + 11.70% PGMap::dump(ceph::Formatter*) const
> | | | | + 11.70% PGMap::dump_pg_stats(ceph::Formatter*, bool) const
> | | | | + 10.90% pg_stat_t::dump(ceph::Formatter*) const
> | | | | | + 4.20% PyFormatter::dump_stream(char const*)
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> | | | | | | | + 2.10% std::basic_ios<char, std::char_traits<char> >::_M_cache_locale(std::locale const&)
> | | | | | | | | + 0.50% std::num_put<char, std::ostreambuf_iterator<char, std::char_traits<char> > > const& std::use_facet<std::num_put<char, std::ostreambuf_iterator<char, std::char_traits<char> > > >(std::locale const&)
> | | | | | | | | + 0.50% bool std::has_facet<std::num_put<char, std::ostreambuf_iterator<char, std::char_traits<char> > > >(std::locale const&)
> | | | | | | | | + 0.40% bool std::has_facet<std::num_get<char, std::istreambuf_iterator<char, std::char_traits<char> > > >(std::locale const&)
> | | | | | | | | + 0.20% std::num_get<char, std::istreambuf_iterator<char, std::char_traits<char> > > const& std::use_facet<std::num_get<char, std::istreambuf_iterator<char, std::char_traits<char> > > >(std::locale const&)
> | | | | | | | | + 0.20% std::ctype<char> const& std::use_facet<std::ctype<char> >(std::locale const&)
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> | | | | | | | + 0.70% std::ios_base::_M_init()
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> | | | | | | + 0.30% std::basic_ostream<char, std::char_traits<char> >& std::__ostream_insert<char, std::char_traits<char> >(std::basic_ostream<char, std::char_traits<char> >&, char const*, long)
> | | | | | | + 0.20% __tz_convert
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>
> --
> Paul Mezzanini
> Sr Systems Administrator / Engineer, Research Computing
> Information & Technology Services
> Finance & Administration
> Rochester Institute of Technology
> o:(585) 475-3245 | pfmeec@xxxxxxx
>
> CONFIDENTIALITY NOTE: The information transmitted, including attachments, is
> intended only for the person(s) or entity to which it is addressed and may
> contain confidential and/or privileged material. Any review, retransmission,
> dissemination or other use of, or taking of any action in reliance upon this
> information by persons or entities other than the intended recipient is
> prohibited. If you received this in error, please contact the sender and
> destroy any copies of this information.
> ------------------------
>
> ________________________________________
> From: Mark Nelson <mnelson@xxxxxxxxxx>
> Sent: Thursday, December 19, 2019 11:47 AM
> To: ceph-users@xxxxxxx
> Subject: [ceph-users] Re: High CPU usage by ceph-mgr in 14.2.5
>
> If you can get a wallclock profiler on the mgr process we might be able
> to figure out specifics of what's taking so much time (ie processing
> pg_summary or something else). Assuming you have gdb with the python
> bindings and the ceph debug packages installed, if you (are anyone)
> could try gdbpmp on the 100% mgr process that would be fantastic.
>
>
> https://github.com/markhpc/gdbpmp
>
>
> gdbpmp.py -p`pidof ceph-mgr` -n 1000 -o mgr.gdbpmp
>
>
> If you want to view the results:
>
>
> gdbpmp.py -i mgr.gdbpmp -t 1
>
>
> Thanks,
>
> Mark
>
>
> On 12/19/19 6:29 AM, Paul Emmerich wrote:
>> We're also seeing unusually high mgr CPU usage on some setups, the
>> only thing they have in common seem to > 300 OSDs.
>>
>> Threads using the CPU are "mgr-fin" and and "ms_dispatch"
>>
>>
>> Paul
>>
>> --
>> Paul Emmerich
>>
>> Looking for help with your Ceph cluster? Contact us at https://croit.io
>>
>> croit GmbH
>> Freseniusstr. 31h
>> 81247 München
>> www.croit.io <http://www.croit.io>
>> Tel: +49 89 1896585 90
>>
>>
>> On Thu, Dec 19, 2019 at 9:40 AM Serkan Çoban <cobanserkan@xxxxxxxxx
>> <mailto:cobanserkan@xxxxxxxxx>> wrote:
>>
>> +1
>> 1500 OSDs, mgr is constant %100 after upgrading from 14.2.2 to 14.2.5.
>>
>> On Thu, Dec 19, 2019 at 11:06 AM Toby Darling
>> <toby@xxxxxxxxxxxxxxxxx <mailto:toby@xxxxxxxxxxxxxxxxx>> wrote:
>> >
>> > On 18/12/2019 22:40, Bryan Stillwell wrote:
>> > > That's how we noticed it too. Our graphs went silent after
>> the upgrade
>> > > completed. Is your large cluster over 350 OSDs?
>> >
>> > A 'me too' on this - graphs have gone quiet, and mgr is using
>> 100% CPU.
>> > This happened when we grew our 14.2.5 cluster from 328 to 436 OSDs.
>> >
>> > Cheers
>> > Toby
>> > --
>> > Toby Darling, Scientific Computing (2N249)
>> > MRC Laboratory of Molecular Biology
>> > Francis Crick Avenue
>> > Cambridge Biomedical Campus
>> > Cambridge CB2 0QH
>> > Phone 01223 267070
>> > _______________________________________________
>> > ceph-users mailing list -- ceph-users@xxxxxxx
>> <mailto:ceph-users@xxxxxxx>
>> > To unsubscribe send an email to ceph-users-leave@xxxxxxx
>> <mailto:ceph-users-leave@xxxxxxx>
>> _______________________________________________
>> ceph-users mailing list -- ceph-users@xxxxxxx
>> <mailto:ceph-users@xxxxxxx>
>> To unsubscribe send an email to ceph-users-leave@xxxxxxx
>> <mailto:ceph-users-leave@xxxxxxx>
>>
>>
>> _______________________________________________
>> ceph-users mailing list -- ceph-users@xxxxxxx
>> To unsubscribe send an email to ceph-users-leave@xxxxxxx
> _______________________________________________
> ceph-users mailing list -- ceph-users@xxxxxxx
> To unsubscribe send an email to ceph-users-leave@xxxxxxx
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