# Bonus topic: Parallelization

Here is a benchmark of using multiple nodes along with k-point parallelize division on a 4x4x1 HB sheet. The supercomputer used is Ohtaka ISSP so the cpu configuration is 64 cores per cpu and 2 cpu per node for a total of 128 cores per node.  

| Node | NK | CPU Time | Wall Time |
|------|----|----------|-----------|
| 1    | 1  | 1m46.90s | 2m 1.68s |
|      |    | 1m47.75s | 1m57.91s |
|      |    | 1m52.00s | 1m58.97s |
| 1    | 2  | 1m33.13s | 1m42.31s |
|      |    | 1m32.42s | 1m39.14s |
|      |    | 1m35.88s | 1m42.57s |
| 2    | 1  | 1m25.44s | 1m43.07s |
|      |    | 1m26.65s | 1m32.39s |
|      |    | 1m22.56s | 1m33.72s |
| 2    | 2  | 1m 7.67s | 1m12.38s |
|      |    | 1m 4.57s | 1m 8.69s |
|      |    | 1m 0.98s | 1m 5.67s |
| 5    | 5  | 40.42s   | 51.43s   |
|      |    | 30.56s   | 34.65s   |
|      |    | 34.67s   | 37.14s   |