wiki:Archer/ArcherUserExperience

Version 1 (modified by grenville, 8 years ago) (diff)

Back to HECToR-ARCHER Comparison

I have been running some N512 tests of my mixed-layer coupled model (UM 7.8 + KPP mixed-layer ocean).

On HECToR, I used cores nodes (960 for the UM, 32 for OASIS and 32 for KPP) and obtained 44.65 model days / wallclock day

On ARCHER, I used 384 cores (336 for the UM, 24 for OASIS and 24 for KPP) and obtained 41.03 model days / wallclock day

If you take the model days/wallclock day figures to be the same, it indicates that HECToR gives the same speed as ARCHER for 2.85x more cores for the atmosphere (960/336).

My jobs were configured identically. I used all the default compilation options on both systems. I do not use OpenMP or the I/O server. OASIS and KPP run much faster the UM, so the coupling is not slowing down the atmosphere. I expect you would see exactly the same for an atmosphere-only job.