Performance of v4.0.5 and 4.3.0
Posted: Tue Oct 04, 2016 6:03 am
Hi Code_Saturne users and developers,
My system is a small cluster which uses Portable Batch System (PBS). I tried a small model of 66704 cells (turbulent junction flow, no heat transfer, picture attached below) with v4.0.5 and then with v4.3.0. Both runs 300 steps using 12 cores (in the same node). What is really strange is the run times are drastically different. v4.0.5 uses 87 seconds elapse time and 1047 seconds total CPU time, but v4.3.0 uses 157706 seconds elapse time and 1893645 seconds total CPU time! Same mesh, identical parameter files. What is going on with v4.3.0? I attach the listing and performance files. Any idea? Thanks.
- ffan
My system is a small cluster which uses Portable Batch System (PBS). I tried a small model of 66704 cells (turbulent junction flow, no heat transfer, picture attached below) with v4.0.5 and then with v4.3.0. Both runs 300 steps using 12 cores (in the same node). What is really strange is the run times are drastically different. v4.0.5 uses 87 seconds elapse time and 1047 seconds total CPU time, but v4.3.0 uses 157706 seconds elapse time and 1893645 seconds total CPU time! Same mesh, identical parameter files. What is going on with v4.3.0? I attach the listing and performance files. Any idea? Thanks.
- ffan