What software will be a good log analyzer
 

I am looking for a tool which can generate a performance report for my cluster.By which I can do a one line analysis of the suitability of the cluster for the workload.Some thing which can tell me performance report of the cluster.What tool or software is available for this?

FlOPS is a benchmarking tool to measure raw computing power in FLoating point Operations Per Second
LINPACK is I believe the generally accepted suite for testing the performance of supercomputer and computer clusters, especially beowulf clusters.
Also, adding performance counter (Perfctr) support to the computer will allow you to analyze computer performance cycle by cycle, allowing you to see the time taken and cycle count of certain operations.