Specifications

24
High Performance Trading/Algo Speed with Wombat Design and Implementation Guide
OL-15617-01
Testing
The standard deviation for the Cisco InfiniBand is 110 µsec versus 430 µsec for ethernet. This is a 74
percent reduction in the standard deviation. During analysis of the data, several outliers were observed
in the ethernet data. These values occurred in almost every run, on every client, and very close to the
same spot during each run. It is believed that these outliers can be attributed to the clock adjustment or
something else on the network that was extraneous to the test. It was decided to eliminate the outliers.
This makes the analysis of DAL's benefits more conservative. A few outliers were noted in the
InfiniBand data, however because they did exhibit the same patter as the outliers on Ethernet, those
points were left into the analysis.
Ta b l e 9 4x Playback Recorded Rate
4x Recorded Rate
Mean latency (milliseconds)
InfiniBand Ethernet
Run 1 Run 2 Run 3 Run 1 Run 2 Run 3
Line 13
1 0.123 0.124 0.140 0.428 0.429 0.426
2 0.131 0.097 0.109 0.416 0.413 0.415
3 0.075 0.116 0.088 0.415 0.414 0.424
4 0.075 0.088 0.082 0.406 0.412 0.411
Line 15
1 0.116 0.124 0.140 0.467 0.457 0.458
2 0.151 0.112 0.109 0.453 0.441 0.440
3 0.083 0.096 0.088 0.448 0.451 0.447
4 0.067 0.086 0.082 0.431 0.434 0.448
Line 17
1 0.127 0.168 0.127 0.418 0.421 0.423
2 0.107 0.164 0.237 0.420 0.415 0.420
3 0.079 0.084 0.077 0.420 0.411 0.418
4 0.128 0.072 0.080 0.393 0.397 0.405
Mean
0.105 0.111 0.113 0.426 0.425 0.428
Mean of all clients, all runs
0.110 0.426