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

Mon Feb 20 23:50:31 GMT 2012

| 25 ms is the timeout I think.

If so, this matches up very well with my experimental results, which was
showing that that a single publisher never went over ~37 message/sec. With
a 25 ms window, the max theoretical throughput would be 40/sec if I'm
understanding you correctly.

On Mon, Feb 20, 2012 at 2:58 PM, Matthew Sackman <matthew at rabbitmq.com>wrote:

> 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.
>
> Matthew
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