cpu

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. dimba 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=/dev/zero of=/dev/null & }; fulload; read; killall dd Repeat the command in the curly brackets as many

How can I get CPU Load per core (quadcore cpu), in C#? Thanks :) You can either use WMI or the System.Diagnostics namespace. From there you can grab any of the performance counters you wish (however it takes a second (1-1.5s) to initialize those - reading values is ok, only initialization is slow) Code can look then like this: using System.Diagnostics; public static Double Calculate(CounterSample oldSample, CounterSample newSample) { double difference = newSample.RawValue - oldSample.RawValue; double timeInterval = newSample.TimeStamp100nSec - oldSample.TimeStamp100nSec; if (timeInterval != 0)

I want to check which CPU architecture is the user running, is it i386 or X64 or AMD64. I want to do it in C#. I know i can try WMI or Registry. Is there any other way apart from these two? My project targets .NET 2.0! You could also try (only works if it's not manipulated): System.Environment.GetEnvironmentVariable("PROCESSOR_ARCHITECTURE") What led me here is checking for a 32 vs 64 bit OS. the highest rated answer is looking at the setting for the Current process . After not finding an answer I found the following setting. Hope this works for you. bool is64 = System.Environment

What are the common algorithms being used to measure the processor frequency? Nathan Fellman Intel CPUs after Core Duo support two Model-Specific registers called IA32_MPERF and IA32_APERF. MPERF counts at the maximum frequency the CPU supports, while APERF counts at the actual current frequency. The actual frequency is given by: You can read them with this flow ; read MPERF mov ecx, 0xe7 rdmsr mov mperf_var_lo, eax mov mperf_var_hi, edx ; read APERF mov ecx, 0xe8 rdmsr mov aperf_var_lo, eax mov aperf_var_hi, edx but note that rdmsr is a privileged instruction and can run only in ring 0. I don

Linux's synchronization primitives (spinlock, mutex, RCUs) use memory barrier instructions to force the memory access instructions from getting re-ordered. And this reordering can be done either by the CPU itself or by the compiler. Can someone show some examples of GCC produced code where such reordering is done ? I am interested mainly in x86. The reason I am asking this is to understand how GCC decides what instructions can be reordered. Different x86 mirco architectures (for ex: sandy bridge vs ivy bridge) use different cache architecture. Hence I am wondering how GCC does effective

Is there an API to get the number of CPUs available in Linux? I mean, without using /proc/cpuinfo or any other sys-node file... I've found this implementation using sched.h: int GetCPUCount() { cpu_set_t cs; CPU_ZERO(&cs); sched_getaffinity(0, sizeof(cs), &cs); int count = 0; for (int i = 0; i < 8; i++) { if (CPU_ISSET(i, &cs)) count++; } return count; } But, isn't there anything more higher level using common libraries? Владимир Николайчук #include <stdio.h> #include <sys/sysinfo.h> int main(int argc, char *argv[]) { printf("This system has %d processors configured and " "%d processors