![]() Prime95 is not actually capable of doing FFTs of anyĪrbitrary size. The size value times 1024 is actually the number of The sizes you select are not the amount of K)" and "Max FFT size (in K)" allow you to pick the minimum and maximum size The "Custom" test allows you to create your own test. It's used in Prime95 to quickly calculate the square of very In case you're interested, "FFT" stands for You run? The answer depends on what you're trying to do. ![]() So the obvious question is: which test should The torture test window presents you with three ready-made tests and an If it crashes or finishes with an error as shown above, then you've got a It's also been known on occasion to crash unstable machines. Prime95 checks its calculationsĪgainst known results so if something goes wrong it will stop automatically. The example above shows a successful run. Test, click the "Test" menu and then click "Stop". If you want to be thorough then let it run for 24 hours. Which is the best test to run for single core CPUs. ![]() ![]() To test your computer, run Prime95 and click the "Options" menu and then But if you would like to contribute some spareĬPU cycles to help find prime numbers, by all means press the "Join GIMPS" When you run it for the first time, click the "Just Stress Prime95 is a distributed program which spreads the work among large numbers The program is free and you can download it Your CPU and the parts of the motherboard which interface with the CPU and Run Prime95 for 24 hours without any errors, then you can usually assume that You're not sure which component is causing the problem. This is a very useful characteristic if your computer is flakey and Which are the interface between your CPU and RAM, then Prime95 has a tendency It hasĪlso gained a reputation for getting errors on computers which are even Prime95 is a program which searches for very large prime numbers. Last updated: JTorture test your CPU with Prime95 Installation And Running Tests Create a system restore point in case something goes wrong.How to find specifications for your computer.Test your motherboard memory with Memtest86.How to install your motherboard chipset drivers.If you can experiment with different setups, that is probably your best best, though it will take a lot of time and effort. Speaking of which, storage and networking can also be bottlenecks for heavily loaded hosts. Having enough dom0 resources (memory, in particular) is also important as it also affects storage I/O. For very heavy loads that are constant, you are of course going t have to make sure your CPU load doesn't max out.Īlso, take NUMA into consideration in assigning cores and how VMs are distributed as that can make a difference. Over- commitment on CPUs of at least a factor of four or five. FOr very variable loads from VMs, over-commitment is normal for XenDesktop for example we had an I was hoping that someone else had done similar testing and might know how much physical resource should remain unassigned for overhead, etc.Īlas, the answer is nearly always "it depends" for situations like this. I am not testing usage of the VMs as the intent is just that they are running at max. My goal is to test the server/hypervisor combo at extremes over time. Most of the documentation is aimed towards normal use cases (as it should), so the magic numbers of multiplying threads/cores by 5 or 10 don't apply. I just don't know if some should be set aside for overhead, or if there is something different about how the hypervisor handles the virtual resources that would make this kind of testing invalid. I am assuming that close to 100% assignment would be best, to mimic as close to possible the physical hardware. If I build 50 and give 0.5% or 5 with 10% each, it would only engage half the physical server. Beyond that requirement, I don't understand the principle of just creating more VM's as a better approach if each VM is running a test program to push it's utilization towards 100%.įor example, If I build 50 VMs and assign each 5% of the cores and memory or build 5 VMs and give each 50%, that goes beyond the physical capabilities of the server, and definitely goes against what the documentation says to do. Even dropping down to the initial example means 48 threads so 2 VMs. I do see that I will have to use multiple VMs simply to use up the vCPUs, as the actual server I am looking at has 96 threads (which citrix seems to look at instead of cores).
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