From mboxrd@z Thu Jan 1 00:00:00 1970 From: andrew.mcdermott@windriver.com (Andrew McDermott) Date: Thu, 12 Feb 2009 11:50:16 +0000 Subject: [ltt-dev] limiting LTTng to a certain set of cores In-Reply-To: <499311CC.2050208@polymtl.ca> (Pierre-Marc Fournier's message of "Wed, 11 Feb 2009 12:58:36 -0500") References: <499311CC.2050208@polymtl.ca> Message-ID: Hi, > Andrew McDermott wrote: >> Is there an easy way to limit LTTng to trace a specified set of cores >> only? I ask because in some 64+ core systems the data set collected >> becomes too large for analysis and the tasks to be analyzed are always >> bound to certain cores (using affinity). >> > > Out of curiosity, how large is "too large"? The "too large" actually refers to the volume or quantiy of (displayed) events. There are a lot of event related to other cores that are of no interest. There's no real issue with processing a multi-gigabyte trace on the host but there are issues with transferring all 64+ channel trace files across a very slow link. What I'm trying to do is filter the set of data that a) needs to be collected and b) transferred half-way around the world. -- andy