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Door database problemen is de uitgebreide uitleg verloren gegaan (
), maar hier is de volledig becommentariseerde code van een benchmarksysteem dat zich niets aantrekt van task switches of thread priorities 
), maar hier is de volledig becommentariseerde code van een benchmarksysteem dat zich niets aantrekt van task switches of thread priorities code:
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| // ------------------------------------------------------------------------
// IdiotProof Benchmark Code
// Written by Curry, original idea from OiSyN
//
// Benchmarks are accurate no matter what thread priority since time
// elapsed is taken from kernel thread monitoring data
// ------------------------------------------------------------------------
#include <windows.h>
#include <stdio.h>
#include <conio.h>
// ------------------------------------------------------------------------
// Helper macros
// ------------------------------------------------------------------------
// Use this macro at the beginning of the function to declare local
// variables used by the benchmark. 10 million iterations gives a fault
// of max. 1 procent
#define MPrepareBenchmark(p_Iterations) \
LARGE_INTEGER l_Before, l_After; \
FILETIME l_CreationTime, l_ExitTime, l_KernelTime; \
int l_Index; \
HANDLE l_ThreadHandle = GetCurrentThread(); \
const int c_Iterations = (p_Iterations)
// The MBeginBenchmark macro initializes loop and prints the method name
#define MBeginBenchmark(p_Name) printf("Method '" #p_Name "'"); \
GetThreadTimes(l_ThreadHandle, &l_CreationTime, &l_ExitTime, \
&l_KernelTime, (LPFILETIME)&l_Before); \
for(l_Index = 0; l_Index != c_Iterations; l_Index++) {
// The MEndBenchmark macro finalizes the loop and prints time results
#define MEndBenchmark } \
GetThreadTimes(l_ThreadHandle, &l_CreationTime, &l_ExitTime, \
&l_KernelTime, (LPFILETIME)&l_After); \
printf(" took %d milliseconds\n", \
(l_After.QuadPart - l_Before.QuadPart) / 10000)
// ------------------------------------------------------------------------
// Main program
// ------------------------------------------------------------------------
int main()
{
// Define benchmark code
MPrepareBenchmark(10000000);
// Following benchmarks were taken from a recent thread on GoT where the
// benchmarking discussion first arose
// Osiris' version
MBeginBenchmark(Osiris);
char Msg[] = "Blablabla";
for(unsigned int i = 0; i != strlen(Msg); i++)
if(Msg[i] == 'a')
Msg[i] = 'c';
MEndBenchmark;
// Curry's version
MBeginBenchmark(Curry684);
char Msg[] = "Blablabla";
for(char *Pointer = Msg; *Pointer; Pointer++)
if(*Pointer == 'a')
*Pointer = 'c';
MEndBenchmark;
// Beelzebubu's version
MBeginBenchmark(Beelzebubu);
char Msg[] = "Blablabla";
for(int i=0;Msg[i];i++)
if(Msg[i]=='a')
Msg[i]='c';
MEndBenchmark;
// Sponz version
MBeginBenchmark(Sponz);
char Msg[] = "Blablabla";
char *p = Msg;
while(p = strchr(p,'a'))
*p='c';
MEndBenchmark;
// Oisyn's version
MBeginBenchmark(Oisyn);
char Msg[] = "Blablabla";
char* Strptr = Msg;
do
{
if(*Strptr == 'a')
*Strptr = 'c';
} while (*Strptr++);
MEndBenchmark;
// Wait for keypress before exit
printf("\nPress any key to exit...");
while(!getch());
return 0;
}
// ------------------------------------------------------------------------ |
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