Author: Vincent Diepeveen
Date: 06:46:01 08/25/02
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On August 24, 2002 at 19:23:23, leonid wrote: >Hi, >It look like that affordable 64 bits chip will come soon, but how soon? If >somebody can update about expectation of this chip, it will be nice. Every >technical detail about next 64 bits chip is welcome. Like number of registers >and every new and special feature on new chip that You know about. Your >impression about new chip influence on everything in programming. Is the Linux >ready for new 64 bits arrival... All OSes will be ready long before it is on the market as i don't doubt they test both windows and linux already for over a year at it now. There has been little released about Hammer (let's skip McKinley as that price range is more than my car is worth). What has been released a few days ago regarding hammer is that simple operations like add, which costs on the K7 about 4 cycle latency, it is costing only 3 cycle latency at the Hammer in 32 bits mode. In 64 bits mode it is 4 cycle latency. There is a good reason to assume the 64 bits instructions are 33% slower than 32 bits. Obviously different versions for different markets get released from hammer. Default hammer is going to run dual, but a version with way more L2 cache will run up to 8 processors (if i understand all this well). Kind of 'xeon' versus 'P3' principle (P4 only is running dual at most). I wouldn't count on the 1 to 2 MB L2 cache Hammers to be within price range of the average poster here at CCC. Hopefully 8cpu capable versions will be there with 256KB L2 cache. The multiprocessor versions of the Hammer will be what most guess it is. It is more like a NUMA system. Getting data from local memory is very fast (faster than RAM is now), but on the other hand getting data from other nodes is a lot slower. So crafty needs a complete redesign in order to be faster on 8 processors than it is at 1 at this system. I'm taking this example because crafty, in comparision to other programs is getting a decent speedup at 4 processors with fast memory access right now. It is not difficult to show that one needs a complete redesign. Up to 4 processors you can still get away with a few small changes, but with 8 processors you won't. >Cheers, >Leonid.
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