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If the node is split each half will want to run at 100% so will fight, eventually it should settle at 50% each. ANSYS solvers are designed to fully utilise a node, so will use 100%. Hyperthreading splits each node into two. Those settings look fine, but I'd expect an error message of some sort if it's not pickup up the second physical processor. Note, I break computers, we have installation & IT specialists to keep them working/clear up afterwards. Ethernet would be for distinct boxes, and I don't know anyone who runs hardware interconnect via Wifi. If the two sockets are on one machine I think they should communicate via the mother board. ![]() I'll move to installation too as Win knows a lot more about this. Note, staff are not permitted to open/download attachments so I don't know what else is attached to your post. If you can attach screen grabs of the launcher (parallel & environment settings we can give you some pointers). Next bit, ANSYS products are licenced to a number of cores, so you may have hit a limit there: I can't tell without seeing the licence file.įinally, running on both cpu may mean you need to alter the parallel settings when you launch Fluent. I'd advise switching it off, but that's something to discuss with your IT department. This is great for word processing etc and really bad for simulation as the solver fights itself for both halves of the core. If I run 32 processes on two CPU sockets (each socket has 18 cores), what alteration in parallel settings do I need to make? I am using ANSYS FLUENT 19.0 and the following are snapshot of the launcher.ġ8 cores with hyperthreading will be the 36 threads: Windows splits a real core in two. Is there any confirmative numerical test for this argument? WINDOWS PARALLEL PROCESSING LICENSEThanks! I will go check with IT department about the license limit and switching hyperthreading OFF.ĭo you mean hyperthreading turns out to be adverse for ANSYS parallel simulations? It's a little bit surprising for me. Thus I guess the "Node" here refers to the fact that my workstation has two distinct Intel Xeon CPUs, and "CPU" here actually refers to the fact that each Intel CPU has 36 threads? How could I confirm the number of compute node and its correspondences with CPUs on my workstation? Seen from Windows Task Manager (snapshot as following), my workstation has two so-called "Node" and each node has 36 CPUs. WINDOWS PARALLEL PROCESSING HOW TOCould anyone tell me why does this happen and how to solve the problem?īTW, I am totally fresh to parallel computing and still confused about the relation between "compute node" and number of CPUs. However, when I type 64 on the "Processes" tab in Fluent launcher as described before, the case is still just allocated to 32 threads on a single CPU. WINDOWS PARALLEL PROCESSING WINDOWS 10When I run ANSYS Fluent using 32 process on my Windows 10 64-bit system by clicking "Fluent launcher -> Processing Options -> Parallel (Local Machine) ->32 Processes", the case can be allocated to 32 threads on one CPU, as observed from Windows Task Manager. I have a workstation with two CPUs and each CPU has 18 cores and 36 threads, so the machine has a total of 36 cores and 72 threads. ![]()
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