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Why VFP8 love AMD ?
Message
De
19/06/2003 13:05:47
 
 
À
19/06/2003 10:02:34
Information générale
Forum:
Visual FoxPro
Catégorie:
Autre
Divers
Thread ID:
00801738
Message ID:
00801835
Vues:
21
>Hi
>
>
>T1=SECONDS()
>PRIVATE i
>FOR I=1 TO 20000000
>NEXT
>? SECONDS()-T1
>
>
>I run this program on my Compaq EVO P4 2,2Ghz and on a PC Athlon XP 2000+.
>
>Result:
>
>              | VFP6SP5  | VFP7SP1  | VFP8
>---------------------------------------------------
>P4 2.2GHZ     |  1.232 s |  1.191 s |  1.503 s
>---------------------------------------------------
>AMD XP 2000+  |          |  1.232 s |  1.171 s
>---------------------------------------------------
>
>
>VFP8 vs VFP7SP1 is 26% SLOWER on P4
>
>VFP8 vs VFP7SP1 is 5% FASTER on ATHLON XP
>
>Why ?
>
>Fabio

Fabio,

Whilst I know very little about the specifics of P4 and AMD, there may be a couple of reasons
(1) on chip instruction cache / instruction prefetch
(2) memory cache (in order to avoid the bus)
(3) bus speed
(4) memory access speed
(5) busy programs on the P4/AMD.
(6) There may even have been more interrupts. A lot can happen in one second
(7) ... those I'm forgetting
Gregory
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