Steve Wise wrote:
Roland Dreier wrote:
> Running this server with clients repeatedly connecting, running
> rpings, and disconnecting, I notice that the virtual memory consumed
> by the process is ever increasing. The shared/and reserved values
> don't increase, but the virtual does. IE: If you watch this process
> via 'top' you'll see the VIRT value increasing steadily over
> time/connections, and the RES/SHR values stay steady. I've seen it
> over 1GB of virtual memory used!
> Q: Have you seen this before? Its like the OS never reuses mappings
> that were setup for memory registrations. Is that normal? Or should
> the virtual size shown in 'top' be reduced whenever a buffer is
> unregistered and freed? There's a definite possibility the code is
> leaking memory, but I'm wondering if this is perhaps a normal anomaly
> with mapping memory in linux...
I've not really tested an app like that, but I would expect that
freeing the memory should prevent your virtual space from growing. I
would recheck your code and maybe add some tracing to make sure that
everything really does get freed -- or try the libibverbs valgrind
support ;)
I'll instrument the code and see if I can find the leak...
What is valgrind (sounds painful :) ?
Valgrind is a freeware tool to detect many memory bugs (including buffer
overrun/underrun/uninitialized and memory leaks).
It can be found in: http://www.valgrind.org/
Dotan
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