cpu | 易学教程

Show CPU cores utilization in MATLAB

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问题 Is anyway (any function etc) to show CPU cores utilization in MATLAB in a GUI likes that we have in Task Manager of windows (Performance Tab)? Thanks. 回答1: To my knowledge, there are no Matlab function which can access the system properties at the level of the process usage. To get this information one must call external classes. A search on internet can fetch you some Java classes which can query the process properties. The advantage of the Java approach is it is more likely to be cross

CPU->GPU transfer vs GPU->CPU transfer

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I have been doing some experiments regarding measuring the latency of data transfer from CPU->GPU and GPU->CPU. I found that CPU->GPU data transfer rate is almost twice as much compared to GPU->CPU transfer rate for a particular message size. Can anybody explain me why this is so? Since don't know the detail about your experiment, like what's CPU/GPU used, how to measure transfer rate, I just guess that, data transfer from CPU->GPU, normally is through DMA. each time it can transfer a block bytes from system memory to graphic memory. But data transfer from GPU->CPU, normally CPU is to read the

Query CPU ID from Python?

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问题 How I can find processor id with py2.6, windows OS? I know that there is pycpuid, but I can't compile this under 2.6. 回答1: Have you tried wmi? Here's a solution: >>> import wmi >>> c = wmi.WMI() >>> for s in c.Win32_Processor(): print s instance of Win32_Processor { AddressWidth = 64; Architecture = 9; Availability = 3; Caption = "Intel64 Family 6 Model 26 Stepping 5"; CpuStatus = 1; CreationClassName = "Win32_Processor"; CurrentClockSpeed = 3068; DataWidth = 64; Description = "Intel64 Family

Recent OpenHardwareMonitor Sample Code C#

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问题 Does anybody know where I can find any recent samples for using OpenHardwareMonitor.dll in C#. I've tried a simple implementation but cannot get the cpu Temp. I know the library must have it since the app itself gets the temperature. I have a feeling you have to register events to get readings on certain things but I'm finding it difficult to find a good example. Computer myComputer = new Computer(); myComputer.Open(); foreach (var hardwareItem in myComputer.Hardware) { if (hardwareItem

Determining the independent CPU's (specified with affinity ID's) for building ATLAS

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I'm trying to determine the independent CPU's (specified with affinity ID's) for building ATLAS on a linux machine with 4 Intel CPU's with hyperthreading (ubuntu 12.04). The reason I'm doing this is that the ATLAS manual says to use only the physical cores on machines with hyper threading, on how to achieve this it says: "...you can tell ATLAS to use only the real cores if you learn a little about your machine. Unfortunately, ATLAS cannot presently autodetect these features, but if you experiment you can discover which affinity IDs are the separate cores,..." Further on a hint is given on how

How does the cache coherency protocol enforce atomicity?

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问题 I understand atomicity can be guaranteed on operations like xsub() , without using the LOCK prefix, by relying on the cache coherency protocol (MESI/MESIF). 1) How can the cache coherency protocol do this??? Its making me wonder if the cache coherency protocol can enforce atomicity, why do we need special atomic types/instructions etc? 2) If MOSI implements atomic instructions across multi-core systems then what is the purpose of LOCK ? Legacy? 3) If MOSI implements atomic instructions and

Memory mapped I/O vs Port mapped I/O [closed]

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问题 As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 6 years ago . Memory mapped I/O is a technique which allows the use of central memory (RAM) to communicate with peripherals. Port mapped I/O uses

Byte vs Short vs Int (Along With The Unsigned Variation) In C#?

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问题 I was told, that as long as memory size was not a huge concern, it is always better to use an int instead of a byte or short because it is actually easier for the CPU to handle an int (the CPU needs to do extra stuff to work with bytes and shorts). Is this true in C#? 回答1: It depends more on the processor than on the language. An 8-bit microcontroller will almost certainly be able to access an 8-bit char faster than a 32-bit int. Being aware of this limitation allows algorithm designers to

Why does it take so many instructions to run an empty program?

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So recently I learned about the perf command in linux. I decided to run some experiments, so I created an empty c program and measured how many instructions it took to run: echo 'int main(){}'>emptyprogram.c && gcc -O3 emptyprogram.c -o empty perf stat ./empty This was the output: Performance counter stats for './empty': 0.341833 task-clock (msec) # 0.678 CPUs utilized 0 context-switches # 0.000 K/sec 0 cpu-migrations # 0.000 K/sec 112 page-faults # 0.328 M/sec 1,187,561 cycles # 3.474 GHz 1,550,924 instructions # 1.31 insn per cycle 293,281 branches # 857.966 M/sec 4,942 branch-misses # 1.69%

What are the possibillities to get overall CPU percentage usage

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I have the following question: In UWP, how can we get an overall CPU percentage usage, RAM usage,free RAM, Running process, etc? It's required for task manager in UWP. Hi after doing some looking it doesn't seem as if you can get the device CPU, RAM and Free Ram or the Running Processes. You can get the CPU, memory as well as the memory limits for an application. You can get these through the following ways: RAM : This is accessed through the MemoryManager Class MemoryManager.AppMemoryUsage And there are some other static members that will help you. CPU : As for CPU this is retrieved using -