Measures of Latency on High Performance Processing Environments

This article presents some performance evaluating results obtained by measuring computer clusters used for high computational capacity. For each cluster, named AIX, Linux, and SP2, measurements was taken comprising the data throughput in the transport layer (TCP and UDP). Using statistical results of the collected data, a linear relation between latency and segment size was determined. From the analysis of the clusters we observed that there is a strong relation between segment size and the latency for collision free environments. Analyzing the clusters, the smaller latency was shown by the Linux cluster with Fast-Ethernet. Although the AIX cluster throughput is greater than the Linux cluster throughput, other factors such as negotiation, encapsulating, etc, seems to consume much effort, increasing the overall latency