The OPAL Discussion Forum

[Nicole Neveu <nneveu AT hawk.iit.edu>]

Hi All,

I typically run small cases on 8 cores, and I'm noticing more overhead on 2.0 than 1.9 for xy parallelization:

1.9 vs 2.0 xy parallelization on 8 cores:

[neveu@beboplogin1 old_opal]$ grep --include=*.out -rnw './' -e "mainTimer"
2.0-> ./standalone_newopal/optLinac_40nC.569053.knld-0046.out:315:Timings{0}> mainTimer........... Wall tot =    570.886, CPU tot =     348.68
1.9-> ./standalone_myopal/optLinac_40nC.569040.knld-0037.out:295:Timings{0}> mainTimer........... Wall tot =    313.199, CPU tot =     313.04

2.0 z parallel only:

[neveu@beboplogin1 rand_sample_small_test]$ grep --include=*.out -rnw './' -e "mainTimer"

./optLinac_40nC_CORES=1/optLinac_40nC.569081.knld-0043.out:217:Timings> mainTimer........... Wall tot =     938.19, CPU tot =     935.99

./optLinac_40nC_CORES=2/optLinac_40nC.569080.knld-0042.out:303:Timings{0}> mainTimer........... Wall tot =    632.148, CPU tot =     631.86
./optLinac_40nC_CORES=4/optLinac_40nC.569079.knld-0041.out:307:Timings{0}> mainTimer........... Wall tot =    491.218, CPU tot =     432.94
./optLinac_40nC_CORES=8/optLinac_40nC.569078.knld-0037.out:315:Timings{0}> mainTimer........... Wall tot =    504.177, CPU tot =     329.67

2.0 xy parallel only:

./optLinac_40nC_CORES=1/optLinac_40nC.569059.knld-0041.out:217:Timings> mainTimer........... Wall tot =    934.293, CPU tot =      930.2

./optLinac_40nC_CORES=2/optLinac_40nC.569050.knld-0043.out:303:Timings{0}> mainTimer........... Wall tot =    654.175, CPU tot =     654.01
./optLinac_40nC_CORES=4/optLinac_40nC.569049.knld-0042.out:307:Timings{0}> mainTimer........... Wall tot =    522.647, CPU tot =     461.41
./optLinac_40nC_CORES=8/optLinac_40nC.569048.knld-0041.out:315:Timings{0}> mainTimer........... Wall tot =    520.827, CPU tot =     383.14

Did something change with the way decomposition is done?

Thanks,

Nicole