ENZO
ENZO Performance Study Summary
This is a short overview to the performance result of the ENZO application. For each experiment we used these inits/param files:
This is a relatively small experiment but was sufficent to generate some interesting performance results. For this study we used the TAU Performance System® to gather information about ENZO's performance, in particular we are interested in the Performance of the AMR simulation at scale. We ran these experiments on NCSA's Intel 64 Linux Cluster (Abe).
TAU Measurement overhead
Here is a short table listing the run-times for various experiments and the instrumentation overhead observed. Each run was on 64 processors (8 nodes).
| Run Type | Runtime (seconds) | Overhead % |
|---|---|---|
| Uninstrumented runtime | 1072 | NA |
| Trace of only MPI event | 1085 | 4.8% |
| Profile of all significant events | 1136 | 6.0% |
| Profile with Call-path information | 1196 | 11.6% |
| Profile of each Phase of execution | 1208 | 12.7% |
Runtime Breakdown on 64 processors
Here is a chart showing the contribution each function makes to the overall runtime. Notice that MPI communication time takes over 60% of the total runtime.
File:Http://giusto.nic.uoregon.edu/~scottb/enzo files/MeanFunctionLinux.png
