Packet analysis: WinXP vs. Linux<->VMS shows dramatic differ ences

[BG - Ben Armstrong]

On Wed, 2004-09-22 at 15:59 +0200, COLLOT Jean-Yves wrote:
> Another way
> to say is: according to me, the "WinXP vs. Linux<->VMS shows dramatic
> differences" topic is true only when using "ruby". Could someone tell me if
> I am right or wrong here?  

We ported the ruby script to C++.  I'm in the process of running tests,
capturing output, and analyzing it as I did before.  Expect results
soon ...

What I can tell you so far is only that the C++ test runs fine on Linux
-> OpenVMS with performance figures similar to the Ruby test.

See samba_test.cpp below:

Ben
-- cut here --
#include <cerrno>
#include <cstdlib>
#include <fstream>
#include <iostream>
#include <string>
#include <ctime>

using namespace std;

int main(int argc, char * argv[]) {
   time_t startTime, endTime;
   char drive[50];
   long int blocks = 10000, blocksize = 1024;

   switch (argc) {
      case 1:
         strcpy(drive, "S:\\");
         break;
      case 2:
         strcpy(drive, argv[1]);
         break;
      case 3:
         strcpy(drive, argv[1]);
         blocks = strtol(argv[2], NULL, 10);
         if (errno == ERANGE) {
            cout << "Invalid # of blocks: " << argv[2] << endl;
            cout << "   Default of 10000 used." << endl;
            blocks = 10000;
         }
         break;
      case 4:
         strcpy(drive, argv[1]);
         blocks = strtol(argv[2], NULL, 10);
         if (errno == ERANGE) {
            cout << "Invalid blocks # used: " << argv[2] << endl;
            cout << "   Default of 10000 used." << endl;
            blocks = 10000;
         }
         blocksize = strtol(argv[3], NULL, 10);
         if (errno == ERANGE) {
            cout << "Invalid blocksize # used: " << argv[2] << endl;
            cout << "   Default of 1024 used." << endl;
            blocksize = 1024;
         }
         break;
      default:
         cout << "Usage: samba_test.exe {drive {blocks {blocksize}}}" << endl;
   }

   cout << "Generating stats with the following arguments:" << endl;
   cout << "Drive: " << drive << endl;
   cout << "Blocks: " << blocks << endl;
   cout << "Blocksize: " << blocksize << endl;
   char * data;
   data = new char[blocksize];
   memset(data, ' ', blocksize); 

   char dataFile[60];
   strcpy(dataFile, drive);
   strcat(dataFile, "BENCH.TMP");

   ofstream fout;
   time(&startTime);   

   fout.open(dataFile);
   if (fout.bad()) {
      cout << "Error opening the data file" << endl;
   }

   for (int i=0; i < blocks; i++) {
      fout << data << endl;
   }

   fout.close();
   remove(dataFile);
   time(&endTime);

   long int elapsed_time = (long) difftime(endTime, startTime),
            bytesOut = blocks * blocksize;

   cout << "On drive " << drive << " time to write " << bytesOut <<
           " bytes = " << elapsed_time << " seconds." << endl;

   delete [] data;
   return 0;
}
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