Author: John Coffey
Date: 18:56:31 10/05/98
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On October 05, 1998 at 20:53:05, Robert Hyatt wrote: >On October 05, 1998 at 17:05:38, John Coffey wrote: > >>Do we know how many bytes pers second a PC can copy? I realize this depends >>upon the cache. For the momemnt, let us assume that it is going to hit the >>same areas (no more than 16K) of memory often. >> >>John Coffey > > >at a bus speed of 100mhz, you get 800M bytes per second, absolute theoretical >max. In reality, it is about 1/4 of this or so, or 200M bytes per second. But >note at that speed, you are doing *nothing* else, just pumping data thru the >cpu... and since copies are a read/write pair, even getting 200M bytes per >second is difficult... > >And a second issue is that this will blow hell out of cache while you are >doing it, naturally... :) If you have cache and hit the same address often, then I wonder if the cache buys you more? Anyhow, the only way I can know for sure is to make a test program and try it. Will let you know what I find out. Maybe in a week or ten days. Right now I have a video game to finish. :-) John Coffey
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