Computing time/effort for model validation

JMannhardt · June 28, 2017, 12:45

Hey folks,
I am comparing different modelling approaches of heat exchangers for my thesis and want to plot accuracy against computing time to find the most efficient model approach. But I am using different computers with different computing powers and thus a "time-based" computing effort might lead to wrong or computer-dependent results. Is there a more suitable and computer-independent way to measure the effort ion CFX?
Cheers Jacob

ghorrocks · June 28, 2017, 18:41

Baseline all the machine first with a small benchmark simulation so you know the relative speeds of the machine. Then you can compare across machines accounting for speed variations. In /examples there is a file Benchmark.def which is ideal for this.

Noe this benchmark is only accurate providing your machines are CPU limited. If you have memory or hard disk speed limitations this method will not work well.

evcelica · June 30, 2017, 08:54

Good idea Glenn,

Also I would think all you should care about is relative time to each other, not absolute computation time?

June 28, 2017, 12:45	Computing time/effort for model validation	#1
JMannhardt New Member Jacob Mannhardt Join Date: Jun 2017 Posts: 2 Rep Power: 0	Hey folks, I am comparing different modelling approaches of heat exchangers for my thesis and want to plot accuracy against computing time to find the most efficient model approach. But I am using different computers with different computing powers and thus a "time-based" computing effort might lead to wrong or computer-dependent results. Is there a more suitable and computer-independent way to measure the effort ion CFX? Cheers Jacob

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June 28, 2017, 18:41		#2
ghorrocks Super Moderator Glenn Horrocks Join Date: Mar 2009 Location: Sydney, Australia Posts: 17,703 Rep Power: 143	Baseline all the machine first with a small benchmark simulation so you know the relative speeds of the machine. Then you can compare across machines accounting for speed variations. In /examples there is a file Benchmark.def which is ideal for this. Noe this benchmark is only accurate providing your machines are CPU limited. If you have memory or hard disk speed limitations this method will not work well.

June 30, 2017, 08:54		#3
evcelica Senior Member Erik Join Date: Feb 2011 Location: Earth (Land portion) Posts: 1,167 Rep Power: 23	Good idea Glenn, Also I would think all you should care about is relative time to each other, not absolute computation time?