On Wed, Mar 20, 2013 at 8:34 AM, Ben Noordhuis <[email protected]> wrote:

> What numbers are you seeing?  large_number / number_of_workers is what
> you should expect to see: a fairly constant total throughput with
> per-worker throughput inversely proportional to the number of workers.
>

In case my description wasn't clear, that's NOT what I'm seeing.

I'm only logging the send rate. I don't care what the workers receive. I
would expect the send rate to be constant since the master is always doing
the same amount of work.

Here's some numbers:

Rate for 1 workers: 249353
Rate for 2 workers: 220569
Rate for 3 workers: 213680
Rate for 4 workers: 205965
Rate for 8 workers: 147463

(the machine has 12 cores)


> Re: hyperthreading, if that's enabled test with num_workers = num_cpus
> / 2 (and pin each worker to a separate physical CPU.  Recent kernels
> do a pretty good job of managing that themselves, though.)
>

As I said in the original post, I did that to eliminate hyperthreading
being a slowdown.

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