56 lines
1.2 KiB
C++
56 lines
1.2 KiB
C++
#define SAMPLE_SIZE 100000
|
|
|
|
U0 TimeIns()
|
|
{
|
|
I64 i,start,end;
|
|
I64 *cached_I64=MAlloc(sizeof(I64)),
|
|
shared_blks,*uncached_I64;
|
|
CBlkPool *bp;
|
|
CHeapCtrl *hc;
|
|
Bool old_preempt;
|
|
|
|
"$$FG,RED$$Now, this demo seems broken, perhaps,\n"
|
|
"because I run in a virtual machine.$$FG$$\n\n";
|
|
CPURep;
|
|
|
|
shared_blks=1;
|
|
bp=MemBlksUncachedAlloc(&shared_blks);
|
|
hc=HeapCtrlIndependentInit(bp,shared_blks<<12);
|
|
uncached_I64=MAlloc(sizeof(I64),hc);
|
|
|
|
old_preempt=Preempt(OFF);
|
|
|
|
//Measure cached time
|
|
start=GetTSC;
|
|
for (i=0;i<SAMPLE_SIZE;i++)
|
|
*cached_I64=i;
|
|
|
|
end=GetTSC;
|
|
" Cached Cycles: %10,d\n",end-start;
|
|
|
|
//Measure uncached time
|
|
start=GetTSC;
|
|
for (i=0;i<SAMPLE_SIZE;i++)
|
|
*uncached_I64=i;
|
|
end=GetTSC;
|
|
"Uncached Cycles: %10,d\n",end-start;
|
|
|
|
"$$FG,GREEN$$The difference is even greater\n"
|
|
"because the loop overhead was not subtracted.$$FG$$\n\n";
|
|
Free(cached_I64);
|
|
Free(uncached_I64);
|
|
MemBlks2MegFree(bp,shared_blks);
|
|
Preempt(old_preempt);
|
|
}
|
|
|
|
TimeIns;
|
|
|
|
/* Program Output$HL,0$$WW+H,1$$FD,1$
|
|
|
|
8 Cores 2.660GHz
|
|
Cached Cycles: 202,220
|
|
Uncached Cycles: 14,357,016
|
|
$FG,2$The difference is even greater
|
|
because the loop overhead was not subtracted.
|
|
$HL,1$*/
|