Difference between revisions of "UM version4.5 GCOM"
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(Created page with 'category:JASMIN '''Comparing the use of different versions of GCOM with UM Version4.5''' =GCOMv3.1= * Compatible with UMv4.5 without any code changes. * Principle benefit i…') |
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'''Comparing the use of different versions of GCOM with UM Version4.5''' | '''Comparing the use of different versions of GCOM with UM Version4.5''' | ||
| + | |||
| + | =Preamble= | ||
| + | |||
| + | Versions of GCOM are available from: | ||
| + | * https://puma.nerc.ac.uk/trac/UM/browser/GCOM | ||
=GCOMv3.1= | =GCOMv3.1= | ||
| Line 6: | Line 11: | ||
* Compatible with UMv4.5 without any code changes. | * 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). | * Principle benefit is a better all-to-all routine (used in gathering output data to the master process). | ||
| + | |||
| + | ==DDR Infiniband & Intel Harpertown== | ||
* For Bristol's BlueCrystal-phase2 machine: | * For Bristol's BlueCrystal-phase2 machine: | ||
| + | |||
| + | {| border="1" cellpadding="10" | ||
| + | !colspan=4|IMB ping-pong message latency | ||
| + | |- | ||
| + | || || 0 bytes || 128 bytes || 1024 bytes | ||
| + | |- | ||
| + | || between nodes || ~3.0us || ~3.8us || ~6.0us | ||
| + | |- | ||
| + | |} | ||
| − | + | {| border="1" cellpadding="10" | |
| + | !colspan=3|%time - 8x8 decomp. | ||
| + | |- | ||
| + | || subruotine || GCOMv2.9b5 || GCOMv3.1 | ||
| + | |- | ||
| + | || gatherfield || 12% || ~5% | ||
| + | |- | ||
| + | || swapbounds || 18% || ~15% | ||
| + | |- | ||
| + | |} | ||
Latest revision as of 16:24, 17 December 2012
Comparing the use of different versions of GCOM with UM Version4.5
Preamble
Versions of GCOM are available from:
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 & Intel Harpertown
- 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% |