56 lines
1.1 KiB
C++
56 lines
1.1 KiB
C++
#define SAMPLE_SIZE 100000
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U0 TimeIns()
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{
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I64 i,start,end;
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I64 *cached_I64=MAlloc(sizeof(I64)),
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shared_blks,*uncached_I64;
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CBlkPool *bp;
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CHeapCtrl *hc;
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Bool old_preempt;
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"$$RED$$Now, this demo seems broken, perhaps,\n"
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"because I run in a virtual machine.$$FG$$\n\n";
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CPURep;
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shared_blks=1;
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bp=Mem2MegUncachedAlloc(&shared_blks);
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hc=HeapCtrlBPInit(bp,shared_blks<<12);
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uncached_I64=MAlloc(sizeof(I64),hc);
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old_preempt=Preempt;
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//Measure cached time
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start=GetTSC;
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for (i=0;i<SAMPLE_SIZE;i++)
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*cached_I64=i;
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end=GetTSC;
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" Cached Cycles: %10,d\n",end-start;
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//Measure uncached time
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start=GetTSC;
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for (i=0;i<SAMPLE_SIZE;i++)
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*uncached_I64=i;
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end=GetTSC;
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"Uncached Cycles: %10,d\n",end-start;
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"$$GREEN$$The difference is even greater\n"
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"because the loop overhead was not subtracted.$$FG$$\n\n";
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Free(cached_I64);
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Free(uncached_I64);
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Mem2MegFree(bp,shared_blks);
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Preempt(old_preempt);
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}
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TimeIns;
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/*Program Output$HL,0$$WW+H,1$$FD,1$
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8 Cores 2.660GHz
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Cached Cycles: 202,220
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Uncached Cycles: 14,357,016
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$FG,2$The difference is even greater
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because the loop overhead was not subtracted.
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$HL,1$*/
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