Diagnosing first vs subsequent performance

Lloyd Brown lloyd_brown at byu.edu
Tue Jan 19 11:54:15 PST 2016

Sure.  I've generated them using something like this:

> $ for i in {0..3}; do echo "Testing display $i"; for j in {1..2}; do
> echo "Instance $j"; DISPLAY=:${i}.0 glxinfo >
> /tmp/glxinfo.display${i}.instance${j}; echo "sleeping 30s"; sleep 30;
> echo "---"; done; echo "sleeping 5s"; sleep 5; echo "------"; done

Note that I did add the delays on purpose.  For some reason, when I ran
the loop without them, it would hang up the second Xorg display
(DISPLAY=:1.0, in this case), when it got to the second glxinfo.  I
don't entirely know what was going on, but the delays seemed to help it

I admit that I'm curious to know what you're looking for in the attached
documents, but if you're trying to verify that the first and second
calls to glxinfo are the same, they certainly are.  Here are the MD5SUMs:

> $ md5sum glxinfo.display*
> 97379d9a7c3332e660ec71a045d6ea1f  glxinfo.display0.instance1
> 97379d9a7c3332e660ec71a045d6ea1f  glxinfo.display0.instance2
> d6484c73ca120a43f4b1abc5b508c168  glxinfo.display1.instance1
> d6484c73ca120a43f4b1abc5b508c168  glxinfo.display1.instance2
> ba989769089853b4cd44bb6c68a53a80  glxinfo.display2.instance1
> ba989769089853b4cd44bb6c68a53a80  glxinfo.display2.instance2
> 11be7dc4379f37cbeeef346df799014b  glxinfo.display3.instance1
> 11be7dc4379f37cbeeef346df799014b  glxinfo.display3.instance2

Note that I did upgrade to the RHEL xorg-x11-server-Xorg RPM to
v1.15.0-36.  It did not have any effect; the same behavior occurred
either way.


On 01/19/2016 12:05 PM, Ilya Anfimov wrote:
> Good day. Could you provide glxinfo output, first and second run on
> different displays?

Lloyd Brown
Systems Administrator
Fulton Supercomputing Lab
Brigham Young University

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