[rabbitmq-discuss] Looking for guidance on R14B04 vs. R13B03 performance

Matthew Sackman matthew at rabbitmq.com
Mon Feb 20 22:58:42 GMT 2012

On Mon, Feb 20, 2012 at 10:22:15AM -0800, Matt Pietrek wrote:
> Ah, thanks so much for this reply Matthew. It's extremely enlightening and
> seems to explain what we're seeing.
> A follow up question just for my understanding: Are these "windows" dynamic
> in nature (e.g., varying length, varying frequency, somehow tied to current
> load)? Or are they more static (e.g. "Once every 20 milliseconds").

25 ms is the timeout I think. If the queue goes "idle" before then (i.e.
has no more work to do) then it will issue the fsync immediately. Thus
this helps prevent latency go up too much for the single-publisher case.


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