cpu

问题 This question already has answers here : Why is transposing a matrix of 512x512 much slower than transposing a matrix of 513x513? (3 answers) Closed 4 months ago . I am reading "Pro .NET Benchmarking" by Andrey Akinshin and one thing puzzles me (p.536) -- explanation how cache associativity impacts performance. In a test author used 3 square arrays 1023x1023, 1024x1024, 1025x1025 of ints and observed that accessing first column was slower for 1024x1024 case. Author explained (background info,

问题 My question is in subject: when we read /proc/cpuinfo virtual file on Android, it contains Serial field. What is the value? Is it the same for all devices that use the same CPU model, or it is unique for each CPU instance? I have GT-I9500 (Samsung Galaxy S4) phone, and its serial last 8 characters are 4d00a804 (revision is 000a ). Maybe anyone can write his last 8 characters for the same model to check if they are unique? 回答1: Serial is some number optionally passed by the bootloader and has

问题 I have to write a CPU scheduling simulation with kernel level threads. I have to be able to use either first come first served (FCFS) or round robin (RR) algorithms. Data for the processes and their threads is given in the form of a text file. At the moment my program reads in the text file data into linked lists. I'm not really sure how to start the simulation (I've never programmed a simulation before). Is this how I would proceed in the case of FCFS? When I get to the first thread of the

问题 I am a beginner of Python (few weeks) and recently i had read some post in Stackoverflow about multiprocessing module . Normally i work with million of points format data (*.las file. This video to understand the source of my data) and I have interest to understand better how use multiprocessing module. I use Python 2.7 on windows 7, intel core i7-3770CPU Normally I use this def wrote from me as a Benchmark to understand: # load line-by-line the las file, check if the points are inside the

问题 This is going to be the most basic and even may be stupid question here. When we talk about using multi threading for better resource utilization. For example, an application reads and processes files from the local file system. Lets say that reading of file from disk takes 5 seconds and processing it takes 2 seconds. In above scenario, we say that using two threads one to read and other to process will save time. Because even when one thread is processing first file, other thread in parallel

问题 Why is the smallest value that can be stored a Byte(8bit) & not a Bit(1bit) in memory? Even booleans are stored as Bytes. Will we ever bump the smallest number to 32 or 64bits like register's on the CPU? 回答1: The underlying methods of processor access are limited to the size of the smallest usable register. On most architectures, that size is 8 bits. You can use smaller portions of these; for instance, C has the bitfield feature in structs that will allow combining fields that only need to be

问题 I am currently writing an application in Windows using C++ and I would like to simulate CPU load. I have the following code: void task1(void *param) { unsigned elapsed =0; unsigned t0; while(1){ if ((t0=clock())>=50+elapsed){//if time elapsed is 50ms elapsed=t0; Sleep(50); } } } int main(){ int ThreadNr; for(int i=0; i < 4;i++){//for each core (i.e. 4 cores) _beginthread( task1, 0, &ThreadNr );//create a new thread and run the "task1" function } while(1){} } I wrote this code using the same

问题 Thanks in advance for any help. I am currently doing some beginner work on ada programming and I have installed GNAT Programming Studio (GPS) from http://libre.adacore.com/download/configurations# I have Windows 10 64-bits. I was given the following code at school: pragma Task_Dispatching_Policy(FIFO_Within_Priorities); with Ada.Text_IO; use Ada.Text_IO; with Ada.Real_Time; use Ada.Real_Time; procedure PeriodicTasks is Start : Time; package Duration_IO is new Ada.Text_IO.Fixed_IO(Duration);

问题 As most of you know CPUs are not well designed to do floating point calculation in contrast to GPUs. I am wondering how to use GPU's power without any abstraction layer or driver. Can I program for a GPU using assembly, C, C++ language (I mean how?). Although assembly seems to help me access the gpu directly, C/C++ are likely to need a medium library (e.g. OpenCL) to access the GPU. Let me ask you another question: How much of a modern GPU's capability will be exposed to a programmer without

问题 We have a ASP.NET MVC4 application which uses Entity Framework 4.0. When we deploy on the production server, the CPU rises after some time (~2-5h) until nearly 100%. The memory also rises then until maximum. After a while the application pool will be resetted automatically because of the high memory. Server: Windows 2008 R2 Standard SP1 IIS: 7 (V 7.5.7600.16385) Only one application pool and one webapplication is running. Stacktrace from Debug Diagnostic Tool of the thread which consumes most