ctdb: Adding memory pool for queue callback

Volker Lendecke Volker.Lendecke at SerNet.DE
Wed Nov 7 16:26:05 UTC 2018

On Wed, Nov 07, 2018 at 05:03:42PM +0100, Swen Schillig wrote:
> On Wed, 2018-11-07 at 16:48 +0100, Volker Lendecke wrote:
> > On Wed, Nov 07, 2018 at 04:30:58PM +0100, Swen Schillig wrote:
> > > Oh, didn't answer your last question....
> > > yes, it does match the CTDB use pattern where we fetch a pool and
> > > then
> > > re-use that memory for as long as we use that queue/connection.
> > 
> > Right, but the devil might be in the details: Do we have a hierarchy
> > hanging off "data" allocated from the pool or not? And does this make
> > a difference for overall performance?
> > 
> No.
> The memory is used as the chunk as it was received and if anything
> special needs to be done, the memory is getting copied into a new
> structure and the old (pool-) memory is free'd.

Just FYI: I get vastly different results depending on the compiler
optimization level. I will do further investigation, it will take a

With best regards,


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