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MEMBENCH.CPP
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C/C++ Source or Header
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1996-04-12
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3KB
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120 lines
#include <assert.h>
#include <windows.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#define CPS ((int)CLOCKS_PER_SEC)
long NIterations;
int NBlocks; /* total number of memory blocks to allocate */
int MinBlockSize; /* minimum block size to allocate */
int MaxBlockSize; /* maximum block size to allocate */
int DummyCount; // so no one can optimize my dummies away
void DummyFree(void* Foo);
void* DummyMalloc(size_t Size);
void BenchMark(void)
{
clock_t StartTime, StopTime, LoopTime, TotalTime;
long i;
void** Pointers;
int* Sizes;
/* first, create array of pointers */
Pointers = (void**)calloc(NBlocks, sizeof(void*));
Sizes = (int*)calloc(NBlocks, sizeof(int));
/* second, initialize sizes to random values */
for(i=0; i < NBlocks; ++i)
{
int Size = rand() % ((MaxBlockSize-MinBlockSize) + 1);
Size += MinBlockSize;
Sizes[i] = Size;
}
/* third, measure basic loop time */
StartTime = clock();
for(i = 0; i < NIterations; ++i)
{
int iBlock = i % NBlocks;
if(Sizes[iBlock]&1) // randomly call dummy free or malloc
{
DummyFree(Pointers[iBlock]);
Pointers[iBlock] = 0;
}
else
Pointers[iBlock] = DummyMalloc(Sizes[iBlock]);
}
StopTime = clock();
LoopTime = StopTime - StartTime;
/* fourth, allocate a random set of blocks */
for(i=0; i < NBlocks; ++i)
if(rand() & 1)
Pointers[i] = new char[Sizes[i]];
/* finally, perform benchmark */
StartTime = clock();
for(i = 0; i < NIterations; ++i)
{
int iBlock = i % NBlocks;
if(Pointers[iBlock])
{
delete[] Pointers[iBlock];
Pointers[iBlock] = 0;
}
else
Pointers[iBlock] = new char[Sizes[iBlock]];
}
StopTime = clock();
TotalTime = (StopTime - StartTime) - LoopTime;
printf("NIterations=%ld, NBlocks=%d, MinBlockSize=%d, MaxBlockSize=%d\n",
NIterations, NBlocks, MinBlockSize, MaxBlockSize);
{
int Secs = TotalTime / CPS;
int Decs = (TotalTime-(Secs*CPS)) / (CPS/10);
printf( "Time = %d.%d\n", Secs, Decs);
printf( "memory time=%ld, loop time=%ld\n", TotalTime, LoopTime);
}
}
void main(int argc, char**argv)
{
// assume at least hundredths of a second resolution
assert(CPS >= 100);
MinBlockSize = 4;
NIterations = 1000L*1000L*5;
if(argc == 3)
{
NBlocks = atoi(argv[1]);
MaxBlockSize = atoi(argv[2]);
}
if(NBlocks < 1 || MaxBlockSize < MinBlockSize)
fprintf(stderr, "Usage: membench <#of blocks> <max block size>\n");
else
BenchMark();
exit(DummyCount?EXIT_SUCCESS:EXIT_FAILURE);
}
// the runtime library will be compared against these
// dummy functions, which represent absolute fastest
// that memory management could be (they do nothing)
void DummyFree(void* /*Foo*/)
{
++DummyCount;
}
void* DummyMalloc(size_t /*Size*/)
{
++DummyCount;
return 0;
}