Hi,
I try some basic benchmark on a small cluster. It's P4 2,4GHz with
83842 ethernet card (mtu 1500).
With 2 nodes I have this:
http://aspirine.li/mesure2.pdf
on Ox it's the size of the packets in bytes, on Oy it's time in seconds
We see very well the mtu effects, but I can't explain the second curve!?
This is what I have done:
- I use a float table which grow every loop
- I send a table 100 times to do get a good time benchmark
This is a part of the result, where we see that every 10bytes I have
strange results:
nodes;time[s];size [bytes]
------------------------------
2;0.000358077;16404<--
2;0.000343283;16408
2;0.000342555;16412
2;0.000342477;16416
2;0.000342885;16420
2;0.000342765;16424
2;0.00034233;16428
2;0.00034231;16432
2;0.000342906;16436
2;0.000342528;16440
2;0.000360112;16444<--
2;0.000343095;16448
2;0.000342613;16452
2;0.000342823;16456
2;0.000342695;16460
2;0.000342781;16464
2;0.000342082;16468
2;0.000342706;16472
2;0.000342361;16476
2;0.000342908;16480
2;0.000358126;16484<--
2;0.000342697;16488
2;0.000342495;16492
2;0.000342806;16496
2;0.000342006;16500
2;0.000342573;16504
2;0.000343114;16508
2;0.000343439;16512
2;0.000343044;16516
2;0.000343867;16520
2;0.000357508;16524<--
If somebody could explain me?
Regards
Ulrich David
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