Re: [ceph-users] Increase tcmalloc thread cache bytes - still recommended?

[Mark Nelson]

I believe that the standard mechanisms for launching OSDs already sets 
the thread cache higher than default.  It's possible we might be able to 
relax that now as async messenger doesn't thrash the cache as badly as 
simple messenger did.  I suspect there's probably still some value to 
increasing it over default though for SSDs.


Mark

On 07/19/2018 01:35 PM, Gregory Farnum wrote:
I don't think that's a default recommendation — Ceph is doing more 
configuration of tcmalloc these days, tcmalloc has resolved a lot of 
bugs, and that was only ever a thing that mattered for SSD-backed OSDs 
anyway.

-Greg

On Thu, Jul 19, 2018 at 5:50 AM Robert Stanford 
mailto:rstanford8...@gmail.com>> wrote:



 It seems that the Ceph community no longer recommends changing to
jemalloc.  However this also recommends to do what's in this
email's subject:
https://ceph.com/geen-categorie/the-ceph-and-tcmalloc-performance-story/

 Is it still recommended to increase the tcmalloc thread cache
bytes, or is that recommendation old and no longer applicable?

 Thanks
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Re: [ceph-users] Increase tcmalloc thread cache bytes - still recommended?

[Gregory Farnum]

I don't think that's a default recommendation — Ceph is doing more
configuration of tcmalloc these days, tcmalloc has resolved a lot of bugs,
and that was only ever a thing that mattered for SSD-backed OSDs anyway.
-Greg

On Thu, Jul 19, 2018 at 5:50 AM Robert Stanford 
wrote:

>
>  It seems that the Ceph community no longer recommends changing to
> jemalloc.  However this also recommends to do what's in this email's
> subject:
> https://ceph.com/geen-categorie/the-ceph-and-tcmalloc-performance-story/
>
>  Is it still recommended to increase the tcmalloc thread cache bytes, or
> is that recommendation old and no longer applicable?
>
>  Thanks
> ___
> ceph-users mailing list
> ceph-users@lists.ceph.com
> http://lists.ceph.com/listinfo.cgi/ceph-users-ceph.com
>
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[ceph-users] Increase tcmalloc thread cache bytes - still recommended?

[Robert Stanford]

 It seems that the Ceph community no longer recommends changing to
jemalloc.  However this also recommends to do what's in this email's
subject:
https://ceph.com/geen-categorie/the-ceph-and-tcmalloc-performance-story/

 Is it still recommended to increase the tcmalloc thread cache bytes, or is
that recommendation old and no longer applicable?

 Thanks
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ceph-users@lists.ceph.com
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