cpu-cores

Is there a way to determine the number of available CPU cores in JavaScript, so that you could adjust the number of web workers depending on that? Yes, navigator.hardwareConcurrency . Supported natively in Chrome, Firefox, Edge, Opera, and Webkit; supported in all browsers with a polyfill . No, there isn't, unless you use some ActiveX. You can try to estimate the number of cores with: https://github.com/oftn/core-estimator demo: http://eligrey.com/blog/post/cpu-core-estimation-with-javascript Here's a fairly quick concurrency estimator I hacked together... it hasn't undergone much testing yet:

In using the Pool object from the multiprocessing module, is the number of processes limited by the number of CPU cores? E.g. if I have 4 cores, even if I create a Pool with 8 processes, only 4 will be running at one time? You can ask for as many processes as you like. Any limit that may exist will be imposed by your operating system, not by multiprocessing . For example, p = multiprocessing.Pool(1000000) is likely to suffer an ugly death on any machine. I'm trying it on my box as I type this, and the OS is grinding my disk to dust swapping out RAM madly - finally killed it after it had

I've been banging my head with this for the last 3-4 days and I can't find a DECENT explanatory documentation (from ARM or unofficial) to help me. I've got an ODROID-XU board (big.LITTLE 2 x Cortex-A15 + 2 x Cortex-A7) board and I'm trying to understand a bit more about the ARM architecture. In my "experimenting" code I've now arrived at the stage where I want to WAKE UP THE OTHER CORES FROM THEIR WFI (wait-for-interrupt) state. The missing information I'm still trying to find is: 1. When getting the base address of the memory-mapped GIC I understand that I need to read CBAR; But no piece of

I just had a quick question on how processors and threads work. According to my current understanding, a core can only perform 1 process at a time. But we are able to produce a thread pool(lets say 30) with a larger number than the number of cores that we posses(lets say 4) and have them run concurrently. How is this possible if we are only have 4 cores? I am also able to run my 30 thread program on my local computer and also continue to perform other activities on my computer such as watch movies or browse the internet. I have read somewhere that scheduling of threads occurs and that sort of

I notice when I run my heavily CPU dependant python programs, it only uses a single core. Is it possible to assign multiple cores to the program when I run it? You have to program explicitly for multiple cores. See the Symmetric Multiprocessing options on this page for the many parallel processing solutions in Python. Parallel Python is a good choice if you can't be bothered to compare the options, look at the examples here . Some problems can't take advantage of multiple cores though. Think about how you could possibly run up the stairs faster with the help of three friends. Not going to

I thought the point of a multi-core computer is that it could run multiple threads simultaneously. In that case, if you have a quad-core machine, what's the point of having more than 4 threads running at a time? Wouldn't they just be stealing time from each other? The answer revolves around the purpose of threads, which is parallelism: to run several separate lines of execution at once. In an 'ideal' system, you would have one thread executing per core: no interruption. In reality this isn't the case. Even if you have four cores and four working threads, your process and it threads will