I've been using a tool called VBinDiff (visual binary diff), so I can
see exactly where the files are different. The differences are
relatively small, only a few hundred bytes concentrated in a few areas.
However, since I'm relatively sure that my performance variations are
stemming from differences in memory state I don't want to ignore
anything that might be causing those differences (and also I'm just
curious as to what's happening.)
On 01/10/2012 11:27 AM, Paul Rosenfeld wrote:
I don't know the answer to your question, but this is certainly a very
interesting experiment.
Are you doing "different or same" comparison or do you have some sense
of how different the memory dumps are? Are we talking a few bytes or
large swaths of memory?
On Tue, Jan 10, 2012 at 11:10 AM, Addison Mayberry
<[email protected] <mailto:[email protected]>> wrote:
Greetings,
I am trying do some detailed performance tests, and to get more
consistent data I have been trying to weed out issues that cause
variation in my results on repeated executions of the same program
from the same image checkpoint. To that end I started doing some
analysis on the following two lines of code being executed in the
simulator:
ptlcall_checkpoint_and_shutdown("connection-made");
ptlcall_single_flush("-run");
After which my benchmark code begins to run. I added code in
PTLSim to do a dump of simulated physical memory when it receives
the "-run" instruction, and comparing these dumps across multiple
runs I found that they were different.
I was aware that MARSS is not guaranteed (or expected) to have
deterministic performance, but I was surprised that there would be
variations in the execution over such a small period of time -
between loading the checkpoint and then dropping into simulation.
Does anyone have any thoughts on what might be causing the
differences in memory state, and what I might be able to do to
keep that from happening and make my tests more repeatable? Thanks
for any insight.
Sincerely,
Addison
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