Red Hat Bugzilla – Bug 101776
many floating point assist faults as web pages visited
Last modified: 2007-06-09 19:03:03 EDT
From Bugzilla Helper: User-Agent: Mozilla/5.0 (X11; U; Linux ia64; en-US; rv:1.4) Gecko/20030709 Description of problem: system log (viewed with 'dmesg') shows lots/repeated floating-point assist faults as mozilla browser (mozilla-bin) runs. (Often this is a case of algorithms that generate and try to use IEEE floating point denormals.) Specifying flush-to-zero-upon-denormal on iA64 - either as a compile option or as a floating point control setting - will reduce or eliminate these time-consuming faults. dmesg logged messages (q.v.) seem to identify a small number of oft-visited locations in code that are generating/consuming the denormals: 200000000015d291 200000000015d301 2000000000c90b01 2000000000c90b31 Version-Release number of selected component (if applicable): mozilla-1.4-3.0.11 How reproducible: Always Steps to Reproduce: 1. Install mozilla, set up needed proxys and visit some pages 2. Use "dmesg" or like to view system log, looking for "floating-point assist fault" messages 3. The messages include the IP at the offending fault Actual Results: messages in the message log, fp assist fault count in CPU goes up Expected Results: no messages, no time-consuming fault handling Additional info:
Red Hat Enterprise Linux 3.0 beta 1 2.4.21-1.1931.2.349.2.2.ent
We get similar messages while running a FE simulation code called Abaqus/Standard. We feel that this leads to lot of performance issues of our program. Can some one suggest a fix for this? Re-compiling the source code is not an option (not in our hand) Sridharan
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