Bug 1301229

Summary:	[doc] TCmalloc 2.4 tunable thread cache size
Product:	[Red Hat Storage] Red Hat Ceph Storage	Reporter:	Federico Lucifredi <flucifre>
Component:	Documentation	Assignee:	Bara Ancincova <bancinco>
Status:	CLOSED CURRENTRELEASE	QA Contact:	ceph-qe-bugs <ceph-qe-bugs>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	1.3.2	CC:	asriram, hnallurv, kdreyer, ngoswami, rgowdege
Target Milestone:	rc	Keywords:	Documentation, ZStream
Target Release:	1.3.2
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2016-03-01 08:23:07 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Federico Lucifredi 2016-01-22 22:35:53 UTC

Description of problem:


RHCS 1.3.2 runs on RHEL 7.2's TCmalloc (version 2.4) which allows tuning of the thread cache.

We need to document 

1. What the default is (128MB)
2. That it changed from previous releases, where it was 32MB
3. How to change the thread cache size from ceph.conf. Sage wrote a patch to take care of this, bug 1297502 tracks that RFE.

Comment 2 Federico Lucifredi 2016-01-22 22:38:16 UTC

This is one of two late-breaking doc bugs. Anjana has been informed.

Comment 3 Ken Dreyer (Red Hat) 2016-02-03 16:45:27 UTC

Please note that the config file to change is:

/etc/sysconfig/ceph (RHEL)

/etc/default/ceph (Ubuntu)

Comment 7 rakesh-gm 2016-02-05 19:28:30 UTC

This bug is not seen in ubuntu. I have checked in "/etc/default/ceph" of Jan 26th 2016 build and the value is TCMALLOC_MAX_TOTAL_THREAD_CACHE_BYTES=128MB in all the osds. However the bug has been verified by Rachana in RHEL. So moving it to Verified stage.