Re: tcmalloc issue

[James Page <james.page@ubuntu.com>]

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I've logged:

https://bugs.launchpad.net/ubuntu/+source/google-perftools/+bug/1439277

The upstream fix applies cleanly to the version of gperftools in 14.04
- - I just need a good reproducer for the SRU test case.

If anyone has one, please detail in the bug report above - I'll also
ping on the upstream bug (but that is from 2013 so might not get much
luck).

On 26/03/15 23:47, Sage Weil wrote:
> Hi James,
> 
> Is it possible to get tcmalloc in trusty updated?  See below.
> 
> Thanks! sage
> 
> On Thu, 26 Mar 2015, Somnath Roy wrote:
> 
>> Sage, Here is the tcmalloc issue I was talking in the performance
>> meeting.
>> 
>> http://code.google.com/p/gperftools/issues/detail?id=585
>> 
>> The tcmalloc is consuming lot of cpus (and eventually slowing
>> down the performance) with the following perf top  trace.
>> 
>> 25.73% libtcmalloc.so.4.1.2 [.]
>> tcmalloc::CentralFreeList::FetchFromSpans() 12.52%
>> libtcmalloc.so.4.1.2 [.]
>> tcmalloc::ThreadCache::ReleaseToCentralCache(tcmalloc::ThreadCache::F
reeList*,
>> unsigned long, int) 11.62% libtcmalloc.so.4.1.2 [.]
>> tcmalloc::CentralFreeList::ReleaseToSpans(void*) 1.56% [kernel]
>> [k] __copy_user_nocache 1.44% libtcmalloc.so.4.1.2 [.]
>> tcmalloc::CentralFreeList::RemoveRange(void*, void*, int) 1.39%
>> libtcmalloc.so.4.1.2 [.]
>> tcmalloc::CentralFreeList::ReleaseListToSpans(void*) 0.89%
>> libtcmalloc.so.4.1.2 [.] operator new(unsigned long)
>> 
>> 
>> The TCMALLOC_MAX_TOTAL_THREAD_CACHE_BYTES is alleviating that but
>> the env variable setting for this is a noop in the binary we are
>> having in Ubuntu 14.04. It is fixed in gperftools-2.1.90
>> release. See the following link.
>> 
>> http://code.google.com/p/gperftools/
>> 
>> We can request Ubuntu guys to incorporate this version or the
>> latest tcmalloc version which is gperftools-2.4.
>> 
>> It will be really helpful if you can push them to incorporate
>> this in 14.04 updates.
>> 
>> Thanks & Regards Somnath
>> 
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> 


- -- 
James Page
Ubuntu and Debian Developer
james.page@ubuntu.com
jamespage@debian.org
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