[httperf] intermittent segmentation violation errors at httperf startup

Arlitt, Martin martin.arlitt at hp.com
Tue Feb 12 16:01:59 PST 2013


Hi Bill

The rule of thumb I was told by the original developer of httperf was one httperf instance per core. However, I can't promise that will resolve the segmentation violation.

Thanks
Martin


From: httperf-bounces at linux.hpl.hp.com [mailto:httperf-bounces at linux.hpl.hp.com] On Behalf Of Freeman, Bill
Sent: Tuesday, February 12, 2013 3:57 PM
To: httperf at linux.hpl.hp.com
Subject: [httperf] intermittent segmentation violation errors at httperf startup

I am running multiple instances of httperf on single machine.  Intermittently I am encountering "child killed: segmentation violation" when starting 20 httperf instances.

On one machine I am launching
10x httperf --server=10.220.1.13 --wsesslog=50,2,/home/logs/httperfFile_audio_android23_64000 --rate=10 --recv-buffer 2048000 --timeout 5
10x httperf --server=10.220.1.13 --wsesslog=50,2,/home/logs/httperfFile_video_android23_2436000 --rate=10 --recv-buffer 2048000 --timeout 5


httperfFile_audio_android23_64000 has 299 unique URLs
httperfFile_video_android23_2436000 has 299 unique URLs

The URL files incrementing start at Fragment0 and increment Fragment values:
/v1/AUTH_VVORIGIN/bucket/413/Big%20Buck%20Bunny.ism/QualityLevels(2436000)/Fragments(video=5760000000)
/v1/AUTH_VVORIGIN/bucket/413/Big%20Buck%20Bunny.ism/QualityLevels(2436000)/Fragments(video=5780000000)
/v1/AUTH_VVORIGIN/bucket/413/Big%20Buck%20Bunny.ism/QualityLevels(2436000)/Fragments(video=5800000000)

This problem is intermittent...  I can run one pass of 20 httperf instances without any problems, then every 3rd of 4th run of the same test group results in 2-3 httperf start failures due to the segmentation violation.

This is being run on a system with 12GB Memory, 16 core 2.93GHz machine with a 10GB nic

Any experiences with 'segmentation violation' errors that may help.
Thank You Bill Freeman
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