michael goulish created DISPATCH-369:
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Summary: investigate excursions in memory usage
Key: DISPATCH-369
URL: https://issues.apache.org/jira/browse/DISPATCH-369
Project: Qpid Dispatch
Issue Type: Bug
Components: Router Node
Affects Versions: 0.6.0
Reporter: michael goulish
Assignee: michael goulish
I don't know if this is a bug or not. I'm Jirifying it as a way of remembering
an interesting behavior that my testing has shown, so that I can continue
developing the testing and come back to this later.
...
While measuring router memory usage under varying message rate and number of
senders -- when I run the same test multiple times, I am occasionally (about 1
in 4 times or so) seeing a test in which memory usage is much higher than the
others.
For example:
In this test:
{
straight-through topology ( 1 sender --> 1 address --> 1 receiver )
200 senders
200 messages per second
100 bytes per message
}
I record router memory usage at the point when all receivers are just hitting
10,000 messages. (This is because it grows -- see previous JIRA.)
In three iterations I get the following memory usage:
66 MB
63 MB
181 MB
Something similar, but less drastic, happened occasionally at lower levels in
the test.
In this case, this is a tripling of memory usage for the same scenario. I
doubt that this is the result of slightly different timing in a block
allocation of data structures. What just happened?
Start by investigating with "qdstat -m" and see if that shows some or all of
the difference.
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