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newly allocated memory seems to point to only 1 zero filled 4k page or something so there is a near 100% cache hit rate ... not very realistic, writeing something in the source array fixes that so the benchmark scores are meaningfull now

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git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@3077 b3059339-0415-0410-9bf9-f77b7e298cf2
This commit is contained in:
michael 2001-11-22 19:22:49 +00:00
parent b1e0f0b3bd
commit 2a6e9d9eda
1 changed files with 6 additions and 3 deletions
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9
TOOLS/fastmemcpybench.c
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@ -95,7 +95,7 @@ static inline unsigned long long int read_tsc( void )
return retval; return retval;
} }
unsigned char arr1[ARR_SIZE],arr2[ARR_SIZE]; unsigned char __attribute__((aligned(4096)))arr1[ARR_SIZE],arr2[ARR_SIZE];
int main( void ) int main( void )
{ {
@ -107,9 +107,12 @@ int main( void )
mga_init(); mga_init();
marr1 = &frame[3]; marr1 = &frame[3];
#else #else
marr1 = &arr1[3]; marr1 = &arr1[0];
#endif #endif
marr2 = &arr2[9]; marr2 = &arr2[0];
for(i=0; i<ARR_SIZE; i++) marr1[i] = marr2[i] = i;
t=GetTimer(); t=GetTimer();
v1 = read_tsc(); v1 = read_tsc();
for(i=0;i<100;i++) memcpy(marr1,marr2,ARR_SIZE-16); for(i=0;i<100;i++) memcpy(marr1,marr2,ARR_SIZE-16);