[Traction]

Hey cfd-online community,

i have an issue regarding the computational time difference between single and multi core simulations (4 cores).
In general multi core processing (of course) needs less time per iteration than a single core process.
But now i´m examining a case where my computer runs nearly out of memory - my RAM usage is nearly at 100% and the computational time for a simulation is determined by the time used for reading, writing and transferring data and not by the amount of cpu cores (cpu usage very low).
I noticed, that in this case the time per iteration on a single core environment is about half the time than on a multi core environment.

Do you have an idea why this happens or can someone explain this ?


Regards
Traction