cpu

问题 I was wondering what the real-world performance effects are of hyperthreading (multiple logical cores for each physical core) in different situations. Intel advertises this as being effective for when threads of execution are waiting for I/O, however in memory intensive applications, it can be ineffective because when a switch occurs between logical cores, locality is lost in the processor cache. The second application's data is loaded into cache, forcing the first application's memory out of

问题 I'm am working to get a powershell command that allows me to pull the average cpu percentage over all the cores for a remote server, and output the value as just the numeric percentage. I am Close but have not been able find a way to just get the Numeric value. The Following is the command I am using followed by the output. Get-WmiObject -computer server -class win32_processor | Measure-Object -property LoadPercentage -Average | FL average Average : 30.5 Thanks in advance for any Help! 回答1:

问题 I found some interesting post about memory usage and CPU usage here on Stack Overflow, however none of them had a direct approach to the apparently simple question: As a generic strategy in a JavaScript app, is it better in terms of performances to use memory (storing data) or CPU (recalculating data each time)? I refer to javascript usage in common browsers environment (FF, Chrome, IE>8) Does anybody have a more direct and documented answer to this? --- EDIT --- Ok, I understand the question

问题 I am writing a little python script to test some stuff. later I want to use it to create resource usage plots with gnuplot, but first a few tests. The script looks like import subprocess result = subprocess.check_output("top -b -n 1 -c", shell=True).split("\n") head = result[:5] body = [x for x in result[7:] if x] #removes empty strings for line in head: print line csum = 0.0 for line in body: print line csum += float(line.split()[8]) print "CPU usage of all processes added up", csum, "%"

问题 Recently I am trying to measure the effect of the cpu scaling. Is it accurate if I use this clock to measure it? template<std::intmax_t clock_freq> struct rdtsc_clock { typedef unsigned long long rep; typedef std::ratio<1, clock_freq> period; typedef std::chrono::duration<rep, period> duration; typedef std::chrono::time_point<rdtsc_clock> time_point; static const bool is_steady = true; static time_point now() noexcept { unsigned lo, hi; asm volatile("rdtsc" : "=a" (lo), "=d" (hi)); return

问题 Write a program using the Android NDK. The program uses a few libraries. All this is very heavy CPU to 90%. How can I find out which of the libraries of most loads the CPU? is there for this special techniques or tools? EDIT: That's what I got: [user@localhost HelloNDK]$ ./remotegdb.sh Package name is org.divenvrsk.android.hellondk Found running pid: 7726 Device CPU ABIs: armeabi-v7a armeabi Using app_out directory: /home/user/Dropbox/HelloNDK/obj/local/armeabi-v7a 68 KB/s (5680 bytes in 0

问题 I wrote a very simple sketch to simulate the interference of two planar waves, very easy. The problem seems to be a little to much intensive for the cpu (moreover processing uses only one core) and I get only 1 o 2 fps. Any idea how to improve this sketch? float x0; float y0; float x1; float y1; float x2; float y2; int t = 0; void setup() { //noLoop(); frameRate(30); size(400, 400, P2D); x0 = width/2; y0 = height/2; x1 = width/4; y1 = height/2; x2 = width * 3/4; y2 = height / 2; } void draw()

问题 Consider I have a software and want to study its behavior using a black-box approach. I have a 3.0GHz CPU with 2 sockets and 4 cores. As you know, in order to find out instructions per second (IPS) we have to use the following formula: IPS = sockets*(cores/sockets)*clock*(instructions/cycle) At first, I wanted to find number of instructions per cycle for my specific algorithm. Then I realised its almost impossible to count it using a block-box approach and I need to do in-depth analysis of

问题 VAX CPUs has a updateable microcode feature. User can reupload microcode to VAX machine and then CPU will behave as not VAX CPU, but e.g. as PDP11 CPU. What CPUs can be simulated with VAX microcode? Can it run machine code from a 6502, 8080, 8086? My question is not about software simulators (like SIMH or qemu; there was an Alpha software simulator, speeded up by some microcode update), but about hardware microcode; both about theoretical possibility of making such microcode and practical

问题 Is there a way to use HTML 5 to access local system hardware details? I'm looking specifically for attributes about CPU, RAM, Disk space, Video card information, Browsers available and plug-ins (with verson information). Ultimately, I am trying to determine if I can build a tool to check a machine for hardware requirements to run software but do so without needing to actually install anything on the machine. Any help is much appreciated! Thanks! 回答1: I don't know if HTML5 can help you but