Run it as a script, in an Automator workflow, whatever: # Get the Process/App names from Activity Monitor and put them here I'm not quite sure how to turn this into a login item since cputhrottle requires superuser permissions. You can monitor a series of processes by name by running the Bash script below. Increasing the system load or reducing the cores or introducing errors and retransmissions and delays and contention in network connections can all expose latent bugs in app code.Cputhrottle is the tool you need. But Arm designs are not a consideration for macOS apps.Īs for why reducing the core count can be interesting, Xcode contains various mechanisms that are useful for load-testing apps, and throttling cores is one way to load-test the performance and behavior of an application. There are lower-powered and lower-speed cores, and higher-powered and higher-speed cores. The Apple A-series Arm processors have heterogeneous cores, which makes multiprocessing and scheduling yet more interesting. Various of the AMD Threadripper multi-core processor designs also have been NUMA designs NUMA within the same socket. Which means there's less need for multiple sockets for many requirements. Intel has been discussing a 56 core processor, and AMD has a 64-core design with 128 threads. That design shift across many different types of desktop and client and server systems, too. There aren't any multi-processors in the current product line, but then the increasing core counts are reducing the need for and avoiding the costs of multi-processor designs. The Cheesegrater Mac Pro and the Xserve Mac are multi-socket and multi-core and NUMA Mac systems. Operating system schedulers do usually show threads as cores, but there's usually more going on within the thread scheduling, and usually less going on in a thread than in a core. On other processors and other designs, threads can provide most of what a core can provide. On some processor architectures and some designs, threads are little better than a mechanism for a faster process context switch and a scheduler optimization. How much less varies by the details of the processor. Multi-threading provides less than what a core provides, or a "thread" would be called a "core". So an 4 core i7 can look like 8 CPUs.īobHarris is aware of the following, but here are some added details. The CPU chip has multiple cores (each core acting as a central processing unit (CPU)), and in the i7 line each core can use HyperThreading to behave as if it is really 2 CPUs. I'm sure there can be others, and except for maybe the power saving aspect, I cannot think of any strong reason for personal computer to disable any CPUs on a chip. In a NUMA (Non-uniform memory access) computer environment, you may want to use affinity to keep a set of processes running on a specific section of the NUMA systems, as the non-uniform memory means a programming sitting in RAM may not be close to some CPU access speed wise, so you try to avoid letting the process schedule on one of those CPUs.In the good old days, before chip based CPUs where the CPU was on 1 or more logic boards, a CPU may fail, and the user could limp along on 1 CPU by shutting down the broken CPU until the service tech could show up, or the customer could take the system offline and not hurt their business. But the VM software is using all the CPUs the box has to offer. This is a weak argument, as today, most cloud vendors just use virtual machines, and assign as many virtual CPUs to the VM as the customer wasn't to pay for. In a cloud environment the cloud vendor may offer different pricing models, and if the customer does not what to pay too much, the cloud vendor may turn off CPUs.The chip itself will often times power down (or low power) circuits that are not in use.
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