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Politics : Formerly About Advanced Micro Devices
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To: Brian Hutcheson who wrote (45535)1/12/1999 11:03:00 AM
From: Ali Chen  Read Replies (1) of 1573092
 
Brian, <but you still have to get the data from RAM into L2 cache and that is a bottleneck>
No, it is not true.
Let's say the Winstone has 10 applications, 2MB code in each, plus
it manages about 80 MB of data during the benchmark. This is
roughly 100MB of data to load. With the real memory bandwidth
of 100MB/s (as measured by STREAM benchmark; P-II goes up
to 200), it will take only ONE SECOND to load all that
stuff into caches. Yet the net benchmark run-time is no
less than 10 minutes, or 600 sec. Therefore the data/code
loads you mention are not the bottleneck. In reality
a computer loads/stores a little bit more, but the
overall rule for caches still holds:
"load once, execute many". That's why the external
bandwidth requirements are minimized, as Scumbria-RYBA
noted.
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