On Fri, Dec 20, 2019 at 6:24 PM Neha Ojha <nojha(a)redhat.com> 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(a)gmail.com> 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(a)redhat.com> 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%
_ZNSt15basic_stringbufIcSt11char_traitsIcESaIcEE7_M_syncEPcmm@plt
>>> | | | | | | | | | + 0.20% __memcpy_ssse3_back
>>> | | | | | | | | + 0.20% ???
>>> | | | | | | | | + 0.10% std::num_put<char,
std::ostreambuf_iterator<char, std::char_traits<char> > >::_M_pad(char,
long, std::ios_base&, char*, char const*, int&) const
>>> | | | | | | | + 0.10%
_ZNKSt7num_putIcSt19ostreambuf_iteratorIcSt11char_traitsIcEEE13_M_insert_intImEES3_S3_RSt8ios_basecT_@plt
>>> | | | | | | + 0.10%
std::ostream::sentry::sentry(std::ostream&)
>>> | | | | | + 2.80%
std::basic_stringbuf<char, std::char_traits<char>, std::allocator<char>
>::str() const
>>> | | | | | | + 1.00%
std::string::assign(std::string const&)
>>> | | | | | | + 0.90% char*
std::string::_S_construct<char*>(char*, char*, std::allocator<char>
const&, std::forward_iterator_tag) [clone .part.1796]
>>> | | | | | + 1.50% std::string::append(char
const*, unsigned long)
>>> | | | | | | + 1.20%
std::string::reserve(unsigned long)
>>> | | | | | | + 0.60%
std::string::_Rep::_M_clone(std::allocator<char> const&, unsigned long)
>>> | | | | | | + 0.10% tc_free
>>> | | | | | + 1.20%
std::string::_Rep::_M_dispose(std::allocator<char> const&) [clone .isra.97]
[clone .part.98]
>>> | | | | | + 1.00%
std::string::append(std::string const&)
>>> | | | | | | + 0.70%
std::string::reserve(unsigned long)
>>> | | | | | | + 0.10% __memcpy_ssse3_back
>>> | | | | | + 1.00% std::basic_string<char,
std::char_traits<char>, std::allocator<char> >::basic_string(std::string
const&, unsigned long, unsigned long)
>>> | | | | | | + 0.80% char*
std::string::_S_construct<char*>(char*, char*, std::allocator<char>
const&, std::forward_iterator_tag) [clone .part.220]
>>> | | | | | + 0.40% std::locale::~locale()
>>> | | | | | + 0.20% tc_free
>>> | | | | | + 0.20% __strlen_sse2_pminub
>>> | | | | | + 0.10% std::ios_base::~ios_base()
>>> | | | | | + 0.10% _ZNSt8ios_baseD2Ev@plt
>>> | | | | | + 0.10%
_ZNKSt15basic_stringbufIcSt11char_traitsIcESaIcEE3strEv@plt
>>> | | | | + 18.20%
PyFormatter::open_object_section(char const*)
>>> | | | | | + 17.10% PyDict_New
>>> | | | | | | + 16.70% _PyObject_GC_New
>>> | | | | | | + 16.70% _PyObject_GC_Malloc
>>> | | | | | | + 16.60% collect
>>> | | | | | | | + 8.10% dict_traverse
>>> | | | | | | | | + 3.20% visit_reachable
>>> | | | | | | | | | + 0.10% type_is_gc
>>> | | | | | | | | + 2.80% visit_decref
>>> | | | | | | | | + 1.60% PyDict_Next
>>> | | | | | | | + 1.30% list_traverse
>>> | | | | | | | | + 0.40% visit_decref
>>> | | | | | | | | + 0.30% visit_reachable
>>> | | | | | | | + 0.60% func_traverse
>>> | | | | | | | + 0.40%
_PyDict_MaybeUntrack
>>> | | | | | | | + 0.10% type_traverse
>>> | | | | | | | + 0.10% subtype_traverse
>>> | | | | | | | + 0.10% set_traverse
>>> | | | | | | | + 0.10% class_traverse
>>> | | | | | | | + 0.10%
_PyDict_MaybeUntrack@plt
>>> | | | | | | + 0.10% PyObject_Malloc
>>> | | | | | + 1.00%
PyFormatter::dump_pyobject(char const*, _object*)
>>> | | | | | + 0.40% PyString_FromString
>>> | | | | | + 0.20%
dict_set_item_by_hash_or_entry
>>> | | | | | + 0.20% PyDict_SetItem
>>> | | | | | + 0.10% app1
>>> | | | | + 6.60%
ceph::Formatter::dump_format_unquoted(char const*, char const*, ...)
>>> | | | | | + 6.60%
PyFormatter::dump_format_va(char const*, char const*, bool, char const*, __va_list_tag*)
>>> | | | | | + 3.90% __vsnprintf_chk
>>> | | | | | | + 3.40% vfprintf
>>> | | | | | | | + 0.50% strchrnul
>>> | | | | | | | + 0.40%
__GI__IO_default_xsputn
>>> | | | | | | | + 0.20% tc_free
>>> | | | | | | | + 0.10% free@plt
>>> | | | | | | | + 0.10% (anonymous
namespace)::free_null_or_invalid(void*, void (*)(void*)) [clone .constprop.41]
>>> | | | | | | + 0.20% _IO_no_init
>>> | | | | | | + 0.10%
_IO_str_init_static_internal
>>> | | | | | + 1.50%
PyFormatter::dump_pyobject(char const*, _object*)
>>> | | | | | | + 0.50% PyString_FromString
>>> | | | | | | + 0.40% PyDict_SetItem
>>> | | | | | | + 0.10%
dict_set_item_by_hash_or_entry
>>> | | | | | | + 0.10% PyDict_SetItem@plt
>>> | | | | | + 1.20% PyString_FromString
>>> | | | | | + 0.60% PyObject_Malloc
>>> | | | | | + 0.20% __strlen_sse2_pminub
>>> | | | | | + 0.10% __memcpy_ssse3_back
>>> | | | | + 0.90% ctime_r
>>> | | | | + 0.80%
PyFormatter::open_array_section(char const*)
>>> | | | | + 0.40%
std::string::_Rep::_M_dispose(std::allocator<char> const&) [clone .isra.846]
[clone .part.847]
>>> | | | | + 0.30% PyFormatter::dump_int(char
const*, long)
>>> | | | | + 0.20% PyFormatter::close_section()
>>> | | | | + 0.10% tc_free
>>> | | | | + 0.10% std::basic_string<char,
std::char_traits<char>, std::allocator<char> >::basic_string(char const*,
std::allocator<char> const&)
>>> | | | | + 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
>>> | | | | + 0.10% PyFormatter::dump_string(char
const*, std::basic_string_view<char, std::char_traits<char> >)
>>> | | | | + 0.10%
PyFormatter::dump_pyobject(char const*, _object*)
>>> | | | + 21.80% Mutex::lock(bool)
>>> | | | | + 21.80% pthread_mutex_lock
>>> | | | | + 21.80% _L_lock_883
>>> | | | | + 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*)
>>> | | | | | | + 2.80% std::basic_ios<char,
std::char_traits<char> >::init(std::basic_streambuf<char,
std::char_traits<char> >*)
>>> | | | | | | | + 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&)
>>> | | | | | | | | + 0.20% bool
std::has_facet<std::ctype<char> >(std::locale const&)
>>> | | | | | | | | + 0.10%
_ZSt9has_facetISt7num_putIcSt19ostreambuf_iteratorIcSt11char_traitsIcEEEEbRKSt6locale@plt
>>> | | | | | | | + 0.70%
std::ios_base::_M_init()
>>> | | | | | | + 0.50%
tcmalloc::ThreadCache::FetchFromCentralCache(unsigned int, int)
>>> | | | | | | + 0.40% std::string::assign(char
const*, unsigned long)
>>> | | | | | | + 0.20% std::locale::locale()
>>> | | | | | | + 0.10% std::ios_base::ios_base()
>>> | | | | | + 1.80%
object_stat_collection_t::dump(ceph::Formatter*) const
>>> | | | | | | + 1.70%
object_stat_sum_t::dump(ceph::Formatter*) const
>>> | | | | | | | + 1.40%
PyFormatter::dump_pyobject(char const*, _object*)
>>> | | | | | | | | + 0.60% dictresize
>>> | | | | | | | | + 0.30% PyString_FromString
>>> | | | | | | | | + 0.20% PyDict_SetItem
>>> | | | | | | | | + 0.10%
dict_set_item_by_hash_or_entry
>>> | | | | | | | + 0.20%
PyFormatter::dump_int(char const*, long)
>>> | | | | | | + 0.10%
PyFormatter::open_object_section(char const*)
>>> | | | | | + 1.80%
PyFormatter::open_array_section(char const*)
>>> | | | | | | + 1.60% PyList_New
>>> | | | | | | | + 1.60% _PyObject_GC_New
>>> | | | | | | | + 1.60% _PyObject_GC_Malloc
>>> | | | | | | | + 1.60% collect
>>> | | | | | | | + 0.80% dict_traverse
>>> | | | | | | | + 0.10% subtype_traverse
>>> | | | | | | | + 0.10% list_traverse
>>> | | | | | | | + 0.10% func_traverse
>>> | | | | | | | + 0.10%
_PyDict_MaybeUntrack
>>> | | | | | | + 0.20%
PyFormatter::dump_pyobject(char const*, _object*)
>>> | | | | | + 1.70%
utime_t::localtime(std::ostream&) const
>>> | | | | | | + 1.00% std::ostream&
std::ostream::_M_insert<long>(long)
>>> | | | | | | | + 0.60% 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, long) const
>>> | | | | | | + 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
>>> | | | | | + 0.90%
PyFormatter::dump_pyobject(char const*, _object*)
>>> | | | | | + 0.20% pg_state_string(unsigned
long)
>>> | | | | | + 0.20%
operator<<(std::ostream&, eversion_t const&) [clone .isra.103]
>>> | | | | | + 0.10% std::ostream&
std::ostream::_M_insert<unsigned long>(unsigned long)
>>> | | | | + 0.40% PyFormatter::dump_stream(char
const*)
>>> | | | | + 0.30%
operator<<(std::ostream&, pg_t const&)
>>> | | | | + 0.10%
PyFormatter::open_object_section(char const*)
>>> | | | + 2.70%
PyFormatter::finish_pending_streams()
>>> | | | | + 1.00%
std::_List_base<std::shared_ptr<PyFormatter::PendingStream>,
std::allocator<std::shared_ptr<PyFormatter::PendingStream> > >::_M_clear()
>>> | | | | | + 0.40%
std::_Sp_counted_ptr_inplace<PyFormatter::PendingStream,
std::allocator<PyFormatter::PendingStream>,
(__gnu_cxx::_Lock_policy)2>::_M_dispose()
>>> | | | | | + 0.20%
tcmalloc::ThreadCache::ListTooLong(tcmalloc::ThreadCache::FreeList*, unsigned int)
>>> | | | | + 0.70% 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(a)rit.edu
>>>
>>> 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(a)redhat.com>
>>> Sent: Thursday, December 19, 2019 11:47 AM
>>> To: ceph-users(a)ceph.io
>>> 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(a)gmail.com
>>>> <mailto:cobanserkan@gmail.com>> 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(a)mrc-lmb.cam.ac.uk <mailto:toby@mrc-lmb.cam.ac.uk>>
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
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