[EternalSeekerX]

Hello everyone,

So as the title says since Ansys supports both which OS do you use? I assume when you start going for bigger cases with more cores (i.e. servers) that's where Linux would be a better choice?

I tested both ansys r19 (centos 7 vm) and ansys r15 (Windows 10) and the results were a mixed bag.

For a 1 million cell fluent case (SIMPLE)the Windows machine took 4min while the Linux one took 3 min and 7 seconds (even with the vm overhead) on a 5960x using 6 physical cores.

For a 4.5 million cell cfx case (Transient) Windows machine took 2hrs and 16 min and 40 seconds while the Linux machine took 2hrs and 16 min and 53 seconds. Given that vm has some overhead, a 14 second delta could be an outlier. Maybe on a bare bone Linux install it will match or be quicker?

I assume when you have more cores and more memory IOPS that's where Linux shines? I mean besides having all cfd codes on Linux is there any other advantage I'm missing?

I'm quite curious?

[evcelica]

For a single machine, I don't think there is usually too much difference, so use what you are comfortable with. Linux should be just slightly better if anything in some cases. Your Fluent bench showed a pretty large difference there, but that may be due to you using two different versions: v15 vs v19.

The main advantage I see with Linux is when you start to distribute to more than one machine. Linux has great support for Infiniband network hardware. InfiniBand on windows with ANSYS is MUCH more difficult. If distributing to more than one machine, Linux should be the choice.