cpu

问题 I want to get the overall total CPU usage for an application in C, the total CPU usage like we get in the TaskManager... I want to know ... for windows and linux :: current Total CPU utilization by all processes ..... as we see in the task manager. 回答1: This is platform-specific: In Windows, you can use the GetProcessTimes() function. In Linux, you can actually just use clock() . These can be used to measure the amount of CPU time taken between two time intervals. EDIT : To get the CPU

问题 I am using Redis as my queue for a producer/consumer relationship in a multiprocessing setup. My problem is that my producers are overloading my consumer then stealing it's CPU. My question, can I allocate an entire processor to specific function/process (IE: the consumer) in this setup. 回答1: It's not something Python does out of the box. Is also somewhat OS-specific. See this answer on doing under Linux: https://stackoverflow.com/a/9079117/4822566 回答2: I just had the similar problem on the

问题 Assume there are two threads running on x86 CPU0 and CPU1 respectively. Thread running on CPU0 executes the following commands: A=1 B=1 Cache line containing A initially owned by CPU1 and that containing B owned by CPU0. I have two questions: If I understand correctly, both stores will be put into CPU’s store buffer. However, for the first store A=1 the cache of CPU1 must be invalidated while the second store B=1 can be flushed immediately since CPU0 owns the cache line containing it. I know

问题 I am trying to get the % of total CPU usage to a label1.Caption I've searched and found these: didn't work - http://www.vbforums.com/showthread.php?345723-DELPHI-Get-CPU-Usage not what I need - http://delphi.cjcsoft.net/viewthread.php?tid=42837 also found bunch of solutions regarding calculating the Usage per process but that is not what i am looking for , i just want the total CPU usage like this widget : this is what i am working on : I believe there is a simple way like when we get RAM

问题 I have the following problem: some processes, generated dynamically, have a tendency to eat 100% of CPU. I would like to limit all the process matching some criterion (e.g. process name) to a certain amount of CPU percentage. The specific problem I'm trying to solve is harnessing folding@home worker processes. The best solution I could think of is a perl script that's executed periodically and uses the cpulimit utility to limit the processes (if you're interested in more details, check this

问题 The normal answers to why data alignment is to access more efficiently and to simplify the design of CPU. A relevant question and its answers is here. And another source is here. But they both do not resolve my question. Suppose a CPU has a access granularity of 4 bytes. That means the CPU reads 4 bytes at a time. The material I listed above both says that if I access a misaligned data, say address 0x1, then the CPU has to do 2 accesses (one from addresses 0x0, 0x1, 0x2 and 0x3, one from

问题 Obviously, a 64-bit processor has a 64-bit address space, so you have more than 4 GB of RAM at your disposal. Does compiling the same program as 64-bit and running on a 64-bit CPU have any other advantages that might actually benefit programs that aren't enormous memory hogs? I'm asking about CPUs in general, and Intel-compatible CPUs in particular. 回答1: There's a great article on Wikipedia about the differences and benefits of 64bit Intel/AMD cpus over their 32 bit versions. It should have

问题 What is the implementation of GCC's (4.6+) __builtin_clz ? Does it correspond to some CPU instruction on Intel x86_64 (AVX) ? 回答1: It should translate to a Bit Scan Reverse instruction and a subtract. The BSR gives the index of the leading 1, and then you can subtract that from the word size to get the number of leading zeros. Edit: if your CPU supports LZCNT (Leading Zero Count), then that will probably do the trick too, but not all x86-64 chips have that instruction. 回答2: Yes, and no. CLZ

问题 Is there a way to convert the os.cpus() info to percentage? Just like the output of iostat (on the CPU section). My code: var os = require('os'); console.log(os.cpus()); The output: [ { model: 'MacBookAir4,2', speed: 1800, times: { user: 5264280, nice: 0, sys: 4001110, idle: 58703910, irq: 0 } }, { model: 'MacBookAir4,2', speed: 1800, times: { user: 2215030, nice: 0, sys: 1072600, idle: 64657440, irq: 0 } }, { model: 'MacBookAir4,2', speed: 1800, times: { user: 5973360, nice: 0, sys: 3197990,

问题 I want to create a near 100% load on a Linux machine. It's quad core system and I want all cores going full speed. Ideally, the CPU load would last a designated amount of time and then stop. I'm hoping there's some trick in bash. I'm thinking some sort of infinite loop. 回答1: You can also do dd if=/dev/zero of=/dev/null To run more of those to put load on more cores, try to fork it: fulload() { dd if=/dev/zero of=/dev/null | dd if=/dev/zero of=/dev/null | dd if=/dev/zero of=/dev/null | dd if=