Bug 456991

Summary:	C++ client consumes 100% CPU when idle
Product:	Red Hat Enterprise MRG	Reporter:	Ted Ross <tross>
Component:	qpid-cpp	Assignee:	Ted Ross <tross>
Status:	CLOSED ERRATA	QA Contact:	Kim van der Riet <kim.vdriet>
Severity:	urgent	Docs Contact:
Priority:	urgent
Version:	1.0	CC:	freznice, gsim, jross, matt
Target Milestone:	1.0.1
Target Release:	---
Hardware:	i386
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2008-10-06 19:08:56 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	459269

Description Ted Ross 2008-07-29 03:50:42 UTC

The C++ client consumes 100% of the CPU (one core on multi-core systems) even
when idle, waiting for messages on a subscription.

To reproduce, simply run the "listener" program in the C++ "direct" example (you
will need to run "declare-queues" first).  While the program waits for incoming
messages, measure the CPU usage of the "lt-listener" process.

Note that this problem only appears to occur on 32-bit architectures.

Comment 1 Gordon Sim 2008-07-29 12:30:36 UTC

I believe this is a result of the fact that Condition::wait(FAR_FUTURE) returns
immediately with ETIMEDOUT.

Comment 2 Gordon Sim 2008-07-29 13:50:31 UTC

Fixed on qpid.0-10 by r680695 and on trunk by r680691.

Comment 4 Frantisek Reznicek 2008-09-09 16:45:25 UTC

There is now RHTS automated test MRG_Messaging/qpid_cpp_client_load_bz456991 which shows that bug has been fixed. (ON_QA->VERIFIED)

Comment 6 errata-xmlrpc 2008-10-06 19:08:56 UTC

An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on therefore solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHBA-2008-0640.html