Author: Vincent Diepeveen
Date: 06:17:54 01/30/02
Go up one level in this thread
On January 29, 2002 at 23:59:10, Tom Kerrigan wrote:
>On January 28, 2002 at 19:31:41, Vincent Diepeveen wrote:
>
>>We have very fast L1 caches and processors nowadays and Crays are not
>>even processors but some big massive things put on each other. Obviously
>>L1 cache is not present (if i understood well).
>>But memory speed versus L1 cache is no compare of course.
>>So the whole comparision is WRONG here.
>
>Ignoring your bad English here ("big massive things put on each other"??) it's
>obvious that you've gone way off track. You and Jay were talking about short
>vector processing, remember? What's with the L1 cache crap?
>
>>Add to that that the velocity engine is for floating point, so how you
>
>That is absolutely false.
>
>>plan to use that is a big mystery to me. Further add to that that the
>>velocity engine is a big joke compared to what a Cray can do for you
>>when talking about multiplication of big arrays.
>
>Who in the world was talking about multiplication of big arrays??
>
>>Did you ever make your own chess engine?
>
>And if he didn't, so what? The fact that you did doesn't mean anything in this
>discussion.
>
>-Tom
I have checked out the instructions for the velocity engine and
could see not a single thing that i could use for my program, apart
from that i am in C, not in assembly, so a compiler would need to
do the work for me.
If you see no usage in velocity engine then the G4 is of course a
very bad processor considering that it took them years to clock to 1Ghz
and its price (if it is already in stock) is for single cpu 1Ghz probably
above that of a 1.6ghz dual K7.
Does the g4 finally have 4x AGP by the way? This is not unimportant for
graphics presentations.
I didn't touch one subject, as i have no knowledge about how G4 is doing it.
But if a program is completely 64+ bits like the g4 is, don't i need
2x more storage space?
So 32KB L1 is kind of a joke then, because let's just calculate the
number of cache lines.
How many instructions can we store in that 32KB and how many datawords
can we store in the data cache in the G4?
32kb for a 64 bits processor sounds very tiny to me personally.
How many clocks is it for branch misprediction, 30?
The truth about the G4 is probably the fact that it is so unknown.
When i tested a 533Mhz dual G4 i had to laugh loud for even trying
some experiments on it.
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