Re: Can extra processing threads help in this case?

From:

"Peter Olcott" <NoSpam@OCR4Screen.com>

Newsgroups:

microsoft.public.vc.mfc

Date:

Mon, 22 Mar 2010 23:33:57 -0500

Message-ID:

<BJOdnS-je-Yi2TXWnZ2dnUVZ_rGdnZ2d@giganews.com>

The code below apparently proves that you were right all
along.
I ran it as two separate processes and it took a like 16.5
seconds for one instance and 16.55 seconds for two
instances.

"Hector Santos" <sant9442@nospam.gmail.com> wrote in message
news:uwC5O9jyKHA.3884@TK2MSFTNGP06.phx.gbl...

Peter Olcott wrote:

Try running your process again using a
std::vector<unsigned int>
Make sure that you initialize all of this to the
subscript of the init loop.
Make sure that the process monitor shows that the amount
of memory you are allocating is the same amount that
total memory is reduced by.
Make sure that you only use 1/2 of total memory or less.
Make a not of the page fault behavior.

I will try the same thing.

You better! :)

I'll BE BACK!

--
HLS

#include <stdio.h>
#include <stdlib.h>
#include <vector>
#include <time.h>

#define uint32 unsigned int

const uint32 repeat = 100;
const uint32 size = 524288000 / 4;
std::vector<uint32> Data;

void Process() {
  clock_t finish;
  clock_t start = clock();
  double duration;
  uint32 num;
  for (uint32 r = 0; r < repeat; r++)
    for (uint32 i = 0; i < size; i++)
      num = Data[num];
   finish = clock();
   duration = (double)(finish - start) / CLOCKS_PER_SEC;
   printf("%4.2f Seconds\n", duration);
}

int main() {
  printf("Size in bytes--->%d\n", size * 4);
  Data.reserve(size);
  for (int N = 0; N < size; N++)
    Data.push_back(rand() % size);

  char N;
  printf("Hit any key to Continue:");
  scanf("%c", &N);

  Process();

return 0;
}