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CPU Speed tester (written in c++) + binary

 
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educofu
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PostPosted: Tue Nov 30, 2010 11:37 am    Post subject: CPU Speed tester (written in c++) + binary Reply with quote

i wrote this just for fun.
Code:

#include <iostream>
#include <time.h>
using namespace std;

int action;
int b;
int a=0;

int main ()
{
    cout << "This will test your CPU current speed (in 10 seconds)\n";
    while(clock ()<=10000)
    {
         if (a=clock())b++;
         a=clock();
         }
    b/=100000;
    cout << "\nYour CPU scored " << b << " Points.";
    b*=4.3;
    cout << "\nYour CPU speed is equivalent to " << b << "Mhz.";
    cin >> action;
    exit(0);
}


i got 1206 (5186Mhz) points with a Pentium Dual-Core E5400(2.7GHz x2) and 463 (1991Mhz) Points with a Semprom 2800 (2.0GHz)

binary: http://ifile.it/b8nm67t

post here yours scores and sugestions!

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Last edited by educofu on Tue Nov 30, 2010 4:15 pm; edited 1 time in total
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92Garfield
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PostPosted: Tue Nov 30, 2010 11:50 am    Post subject: Reply with quote

Only uses 1 core.

AMD 64 x2 6000+

780 and 3353 Mhz

Also, what is clock()?

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Jorg hi
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PostPosted: Tue Nov 30, 2010 2:40 pm    Post subject: Reply with quote

I think clock() returns the total clock ticks elapsed since the program was launched. But what Garfield said that it only checks 1 core. And its doesn't do anything with pipelines, and its limited to the compilation of the code. But it still is decent.

My score was 883 Points/3796Mhz.

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hcavolsdsadgadsg
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PostPosted: Tue Nov 30, 2010 2:48 pm    Post subject: Reply with quote

this is not a very accurate representation of speed, nor a very good test since the number of times it loops (doing almost nothing) is so low
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educofu
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PostPosted: Tue Nov 30, 2010 3:33 pm    Post subject: Reply with quote

slovach wrote:
this is not a very accurate representation of speed, nor a very good test since the number of times it loops (doing almost nothing) is so low


actually i think this program is a decent test. it works like this:

start counting in ms
get the value of current time in ms
sum how many times the time is the same.

thats in 10 seconds, or 10000 ms, wich allows a good precision of results.

but what i think is that the equivalent speed in MHz shoudnt be always considered, since the constant im using (4.3) may vary according the CPU cache, ram, etc...

also just tested on a Celeron 2.53Ghz + 512 ram and got a result of 366 points and 1573 Mhz

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Dark Byte
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PostPosted: Tue Nov 30, 2010 5:08 pm    Post subject: Reply with quote

tip: make it spawn several threads (based on the total number of logical cpu's) and do the calculation in there

then count it all up for a total (spawn all threads at the same time, each thread runs infinitely , wait 10 seconds and then suspend all threads and count how many iterations each thread has done)


also, add some memory access stuff:
add "volatile" before a variable declaration to make sure it's not being optimized into a single register

or if you intend on having register only calculations leave it like this

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Jani
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PostPosted: Wed Dec 01, 2010 3:25 am    Post subject: Reply with quote

Code:
#include <iostream>
#include <ctime>

int main(int argc, char *argv[])
{
   std::cout << "Clock() is already returning: " << std::endl;
   std::cout << clock() << std::endl;

   int a = 0;
   int b;

   std::cout << "b is just some random value, might not be 0: " << b << ". The compiler warns about it and 2010 CRT won't even run the app if b isn't initialized" << std::endl;

   while(clock() <= 10000) {
      if(a = clock()) {
         std::cout << "This block is executed always" << std::endl;
         b++;
      }
      a = clock();
   }

   std::cout << "What do I do with this a: " << a << std::endl;

   return 0;
}
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Slugsnack
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PostPosted: Wed Dec 01, 2010 9:52 am    Post subject: Reply with quote

you do know about context switching right ?
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educofu
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PostPosted: Fri Dec 03, 2010 12:54 pm    Post subject: Reply with quote

just tested on a Celerom M 900 MHz 1 gb and got 311 points (1,33 GHz), This shows i cant consider the equivalent speed.
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Bamases
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PostPosted: Mon Dec 06, 2010 12:14 pm    Post subject: Reply with quote

469 points fail.
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