Difference between revisions of "UM version4.5 GCOM"
Jump to navigation
Jump to search
| Line 20: | Line 20: | ||
|} | |} | ||
| − | + | ||
{| border="1" cellpadding="10" | {| border="1" cellpadding="10" | ||
Revision as of 16:20, 17 December 2012
Comparing the use of different versions of GCOM with UM Version4.5
GCOMv3.1
- Compatible with UMv4.5 without any code changes.
- Principle benefit is a better all-to-all routine (used in gathering output data to the master process).
DDR Infiniband
- For Bristol's BlueCrystal-phase2 machine:
| IMB ping-pong message latency | |||
|---|---|---|---|
| 0 bytes | 128 bytes | 1024 bytes | |
| between nodes | ~3.0us | ~3.8us | ~6.0us |
| %time - 8x8 decomp. | ||
|---|---|---|
| subruotine | GCOMv2.9b5 | GCOMv3.1 |
| gatherfield | 12% | ~5% |
| swapbounds | 18% | ~15% |