Author: Vincent Diepeveen
Date: 13:16:47 10/15/03
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On October 15, 2003 at 16:13:00, Robert Hyatt wrote: >On October 15, 2003 at 13:43:03, Mridul Muralidharan wrote: > >>Hi, >> >> I think there could be a possible unintentional error in your statements. >> >>If you see evolution of cray : >>1) better cycle times (from 12.5ns in the Cray 1 down to 2. 9ns in the SX 3) and >>2) higher number of floating point operations initiated per cycle - from 2 flops >>cycle in the Cray 1 up to 4 in the Cray C 90 and 16 in the SX 3. >> >>Regards >>Mridul > > >We are not talking about floating point ops. We are talking about instructions >executed. (issued in Vincent's terminology). That has _always_ been one >instruction per cycle, since the first Cray-1, through the T90. The C90 15 simultaneously at a single C90 processor. >can do more than four floating point operations per cycle. A single vector >operation does two per cycle. You can chain multiple vector instructions >together to go beyond that. The theoretical limit ought to be beyond 8 but >I will check my C90 manual when I get back in the office...
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