michael goulish created PROTON-1170:
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Summary: closed links are never deleted
Key: PROTON-1170
URL: https://issues.apache.org/jira/browse/PROTON-1170
Project: Qpid Proton
Issue Type: Bug
Components: proton-c
Environment: miserable
Reporter: michael goulish
I wrote a reactor-based application that makes a single connection, and then
repeatedly makes-and-closes links (receivers) on that connection.
It makes and closes the links as fast as possible: as soon as it gets the
on_receiver_close event, it makes a new one. As soon as it gets the
on_receiver_open event -- it closes that receiver.
This application talks to a dispatch router.
Problem: Both the router and my application grow their memory (RSS) rapidly --
and the router's ability to respond to new link creations slows down rapidly.
Looking at the router with Valgrind/Callgrind, after about 15,000 links have
been created and closed I see that 45% of all CPU time on the router is being
consumed by pn_find_link(). Instrumenting that code, I see that the list it
is looking at never decreases in size.
I tried creating my links with the "lifetime_policy" set to DELETE_ON_CLOSE,
but that had no effect. Grepping for that symbol, I see that it does not occur
in the proton C code except in its definition, and in a printing convenience
function.
Major scalability bug.
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