On 12/24/19 9:19 PM, Neha Ojha wrote: > The root cause of this issue is the overhead added by the network ping > time monitoring feature for the mgr to process. > We have a fix that disables sending the network ping times related > stats to the mgr and Eric has helped verify the fix(Thanks Eric!) - > https://tracker.ceph.com/issues/43364#note-9. We'll get this fix out > in 14.2.6 after the holidays. > It's after the holidays now and this is affecting a lot of deployments. Can people expect 14.2.6 soon? Wido > > > On Fri, Dec 20, 2019 at 6:24 PM Neha Ojha <nojha@xxxxxxxxxx> wrote: >> >> Not yet, but we have a theory and a test build in >> https://tracker.ceph.com/issues/43364#note-6, if anybody would like to >> give it a try. >> >> Thanks, >> Neha >> >> On Fri, Dec 20, 2019 at 2:31 PM Sasha Litvak >> <alexander.v.litvak@xxxxxxxxx> wrote: >>> >>> 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 >>>>> | | + 91.30% PyObject_Call >>>>> | | + 91.30% instancemethod_call >>>>> | | + 91.30% PyObject_Call >>>>> | | + 91.30% function_call >>>>> | | + 91.30% PyEval_EvalCodeEx >>>>> | | + 88.40% PyEval_EvalFrameEx >>>>> | | | + 88.40% PyEval_EvalFrameEx >>>>> | | | + 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) >>>>> | | | | | + 10.50% std::basic_ostringstream<char, std::char_traits<char>, std::allocator<char> >::basic_ostringstream(std::_Ios_Openmode) >>>>> | | | | | | + 9.30% std::basic_ios<char, std::char_traits<char> >::init(std::basic_streambuf<char, std::char_traits<char> >*) >>>>> | | | | | | | + 7.00% std::basic_ios<char, std::char_traits<char> >::_M_cache_locale(std::locale const&) >>>>> | | | | | | | | + 1.60% std::ctype<char> const& std::use_facet<std::ctype<char> >(std::locale const&) >>>>> | | | | | | | | | + 1.50% __dynamic_cast >>>>> | | | | | | | | | + 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 >>>>> | | | | | | | | | + 0.90% __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 >>>>> | | | | | | | | + 1.10% bool std::has_facet<std::num_put<char, std::ostreambuf_iterator<char, std::char_traits<char> > > >(std::locale const&) >>>>> | | | | | | | | | + 0.90% __dynamic_cast >>>>> | | | | | | | | + 1.00% bool std::has_facet<std::num_get<char, std::istreambuf_iterator<char, std::char_traits<char> > > >(std::locale const&) >>>>> | | | | | | | | | + 0.70% __dynamic_cast >>>>> | | | | | | | | | + 0.10% std::locale::id::_M_id() const >>>>> | | | | | | | | | + 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() >>>>> | | | | | | | | + 0.80% std::locale::operator=(std::locale const&) >>>>> | | | | | | | | + 0.80% std::locale::locale() >>>>> | | | | | | | | + 0.30% std::locale::~locale() >>>>> | | | | | | | | + 0.10% _ZNSt6localeC1Ev@plt >>>>> | | | | | | | + 0.20% _ZNSt8ios_base7_M_initEv@plt >>>>> | | | | | | + 0.90% std::locale::locale() >>>>> | | | | | | + 0.10% std::ios_base::ios_base() >>>>> | | | | | | + 0.10% _ZNSt9basic_iosIcSt11char_traitsIcEE4initEPSt15basic_streambufIcS1_E@plt >>>>> | | | | | + 2.80% std::ostream& std::ostream::_M_insert<unsigned long>(unsigned long) >>>>> | | | | | | + 2.40% std::num_put<char, std::ostreambuf_iterator<char, std::char_traits<char> > >::do_put(std::ostreambuf_iterator<char, std::char_traits<char> >, std::ios_base&, char, unsigned long) const >>>>> | | | | | | | + 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% 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PyFormatter::dump_pyobject(char const*, _object*) >>>>> | | | | + 0.50% std::string::replace(unsigned long, unsigned long, char const*, unsigned long) >>>>> | | | | + 0.30% PyString_FromString >>>>> | | | + 1.10% PyEval_RestoreThread >>>>> | | | + 1.10% PyThread_acquire_lock >>>>> | | | + 1.10% sem_wait@@GLIBC_2.2.5 >>>>> | | | + 1.10% __new_sem_wait_slow.constprop.0 >>>>> | | | + 1.10% do_futex_wait.constprop.1 >>>>> | | + 2.90% frame_dealloc >>>>> | | + 2.90% dict_dealloc >>>>> | | + 2.90% list_dealloc >>>>> | | + 2.90% dict_dealloc >>>>> | | + 1.90% list_dealloc >>>>> | | | + 1.90% dict_dealloc >>>>> | | | + 1.70% list_dealloc >>>>> | | | + 1.50% dict_dealloc >>>>> | | | | + 0.90% dict_dealloc >>>>> | | | | + 0.10% PyObject_Free >>>>> | | | + 0.10% tcmalloc::ThreadCache::ListTooLong(tcmalloc::ThreadCache::FreeList*, unsigned int) >>>>> | | + 0.30% PyObject_Free >>>>> | | + 0.20% dict_dealloc >>>>> | + 8.10% Gil::Gil(SafeThreadState&, bool) >>>>> | + 8.10% PyEval_RestoreThread >>>>> | + 8.10% PyThread_acquire_lock >>>>> | + 8.10% sem_wait@@GLIBC_2.2.5 >>>>> | + 8.10% __new_sem_wait_slow.constprop.0 >>>>> | + 8.10% do_futex_wait.constprop.1 >>>>> + 0.60% std::condition_variable::wait(std::unique_lock<std::mutex>&) >>>>> >>>>> -- >>>>> 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: 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 >>>> _______________________________________________ >>>> 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 > _______________________________________________ > 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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