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-   -   Memory Utilization with Flow-3D (http://www.cfd-online.com/Forums/flow-3d/72615-memory-utilization-flow-3d.html)

ck5285 February 11, 2010 21:31

Memory Utilization with Flow-3D
 
All
noticed that by using SMP version the CPU utilization is high (without GMO option turn on) but memory utilization is always low at around 200MB-400MB. so I wonder why the program didn't fully utilize the memory size that my system have (32GB RAM) in order to provide additional speed up in simulation time?Thanks.

MuxaB February 25, 2010 13:25

Quote:

Originally Posted by ck5285 (Post 245782)
All
noticed that by using SMP version the CPU utilization is high (without GMO option turn on) but memory utilization is always low at around 200MB-400MB. so I wonder why the program didn't fully utilize the memory size that my system have (32GB RAM) in order to provide additional speed up in simulation time?Thanks.

The memory usage is largely determined by the mesh size and the selection of physical and numerical options. SMP parallelization in FLOW-3D does not add much to this, although it could have been done in a way that would consume much more memory - in proportion to the number of threads used, but this does not seem reasonable.

ck5285 March 1, 2010 00:50

Michael
so can you advice what physic, solver setting & mesh size will allow full memory utilization? btw, should i expected simulation time speed up if the memory utilization is 100%?

MuxaB March 1, 2010 12:22

Quote:

Originally Posted by ck5285 (Post 247843)
Michael
so can you advice what physic, solver setting & mesh size will allow full memory utilization? btw, should i expected simulation time speed up if the memory utilization is 100%?

I am not sure what you mean by 100% memory utilization. Do you want FLOW-3D to use all 32 Gb of memory? If you are asking rather what options have been SMP parallelized, please see this article http://www.flow3d.com/resources/news...fall07_06.html.

shstyle0 May 12, 2010 03:17

re
 
I don't think using more memory would speed up the simulation. memory is like a hard drive, a storage. Using 100% memory would mean you have 32 Gb for your computer to remember, which means your cpu would have more stuff to calculate.
If you use more cells (smaller cells), then your memory usage would go up, but the calculation time will be much longer I believe.


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