![]() In next Year I will run several benchmarks to study more deeply problem of calculation performance against memory used, optimal cells amount per single process and other problems - and I will gladly share results with FDS community.Figure H-4. PYROSIM CALCULATION CLOCK FULLI have 64GB of RAM, but according to my benchmarks this value must me multiplied by 2 in order to use full potential of this machine. ![]() It gives 64 cores on single work station. ![]() I have single calculation station, equipped with 4-processor mainboard with 16-core OPTERON CPUs. In my opinion You should have two times more GB of RAM, then the cores if You are going to run large sceneries. It is good practice to evaluate maximum amount of cells in accordance to rules of thumb listed above, before starting any calculations. If Your amount of memory is adequate the main role in calculation speed plays speed of Your cores, and of course: number of cells per core ratio. So, discussion about impact of amount of RAM in terms of callculation speed - can be reduced to removing bottleneck problem. But further expansion of RAM wont bring any difference. So, If You are performing calculation with number of cells close to Your maximum RAM capacity, and then You expand your memory - you can observe some improvement in calculation speed - all this can happen because solver will stop using virtual memory. If it happens, You will notice significant performance drop of Your calculation. If You are building model where amount of grid cells is close to Your RAM capacity - You cant be sure, if solver will use your hard drive to dump some temporary data from calculation process (page file / virtual memory) - or not. This value can differ between 0,5-2GB depending on Your installed OS It is crucial to remember about some memory reservation for Your OS. Meshes: 1mln cells / 2,15 GB RAM (calculated from my largest case). When you are running large scenarios involving use of multiple parallel When you are running single mesh case, you can assume: 1mln cells / 1,0 GB RAM I have ran several large-cell cases (30-50mln cells) last months, and so far my conclusion are as follows:ฤก. ![]() This new computer will only run FDS models, so if anyone has any advice as to what the best option is, it would be greatly appreciated. Is RAM related only to the amount of cells you have? For example, if I had a 10 million cell model and a computer with 10GB RAM, would it run faster on the same computer but with 128GB RAM? We also need to decide how much RAM to get. Would the new machine significantly shorten the simulation time? As in, by at least half or three times compared to the old machine? Or would it take the same amount of time to run the simulation unless I split the model into more meshes? Typically, we would run models with under 10 million cells (more like 5 million normally). We need to shorten the run times on our models. ![]() PYROSIM CALCULATION CLOCK 64 BITWe are interested in getting a new 64 bit Six Core model with a lot of RAM. PYROSIM CALCULATION CLOCK 32 BITWe currently use two or three old 32 bit dual core Intel Xenon at 4 GB machines (running Windows XP). I am looking for some help in choosing a new computer specifically for running FDS on at work. ![]()
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