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Strumenti |
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#1 |
Senior Member
Iscritto dal: Apr 2001
Messaggi: 2153
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Discussione seria sulle pipeline!
Prima di dirvi la mia teoria rispondete a questa mia domanda, per eseguire uno stadio delle pipeline ci vuole un ciclo di clock vero?
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Core2Duo E6300, Asrock ConreoXfire-eSata2, 2GB DDR2-667 Team Elite CL4, PointofView 7900GS , Creative SB Audigy2 , 2HD WD2500KS-sata Raid-0, Mast Pioneer DVR-212-Sata, Inspire4.1 4400 |
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#2 | |
Senior Member
Iscritto dal: Nov 2001
Messaggi: 445
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Re: Discussione seria sulle pipeline!
Quote:
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#3 |
Senior Member
Iscritto dal: Nov 2001
Messaggi: 445
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Ci vuole uno ed un solo ciclo, altrimenti non sarebbe uno "stadio di una pipeline".
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#4 |
Senior Member
Iscritto dal: Apr 2001
Messaggi: 2153
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Ok quindi per eseguire un calcolo nella pipeline dell'Athlon ci vogliono 10 cicli (10 stadi della pipeline) e nel P4 20 cicli (20 stadi delle pipeline) vero?
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Core2Duo E6300, Asrock ConreoXfire-eSata2, 2GB DDR2-667 Team Elite CL4, PointofView 7900GS , Creative SB Audigy2 , 2HD WD2500KS-sata Raid-0, Mast Pioneer DVR-212-Sata, Inspire4.1 4400 |
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#5 |
Senior Member
Iscritto dal: Oct 1999
Messaggi: 3780
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Ad ogni ciclo di clock ogni stadio mette nel registro di Pipe il risultato delle sue operazioni ... al clock successivo lo stadio seguente accede alo stesso registro per avre i dati in Input
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#6 | |
Senior Member
Iscritto dal: Nov 2001
Messaggi: 445
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Quote:
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#7 |
Senior Member
Iscritto dal: Nov 2001
Messaggi: 445
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E, nel caso del pentium4, che l'istruzione sia già stata precodificata.
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#8 |
Senior Member
Iscritto dal: Apr 2001
Messaggi: 2153
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Allora supponendo che ci vogliono 20 cicli di clock per eseguire un operazione sugli interi su di un P4.......su un Athlon ce ne vorrebbero 10!
E quindi un operazione che entra nella pipeline di un P4 ci mette 20 cicli per essere eseguita......e nel Athlon 10! Quindi sempre in teoria ci vorrebbe un P4 di doppia frequenza per stare dietro all'Athlon! ![]() Mi confermate quello che sto dicendo? Altra cosa.........io sto parlando di ALU.......ma quanti stadi delle pipeline ha l'FPU del Athlon?? e Del p4?? ![]()
__________________
Core2Duo E6300, Asrock ConreoXfire-eSata2, 2GB DDR2-667 Team Elite CL4, PointofView 7900GS , Creative SB Audigy2 , 2HD WD2500KS-sata Raid-0, Mast Pioneer DVR-212-Sata, Inspire4.1 4400 |
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#9 | |
Senior Member
Iscritto dal: Nov 2001
Messaggi: 445
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Quote:
Altra cosa.........io sto parlando di ALU.......ma quanti stadi delle pipeline ha l'FPU del Athlon?? e Del p4?? ![]() P4 e K7 non hanno più di una pipeline per il calcolo in FP, e di lughezza diversa. Per fare un'esempio, una somma il p4 impiega 4 cicli in più di una normale operazione intera, nel caso del K7 i cicli aggiuntivi sono 3. |
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#10 | ||
Senior Member
Iscritto dal: Nov 2001
Messaggi: 445
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Quote:
[b] Quote:
Per fare un'esempio, una somma il p4 impiega 4 cicli in più di una normale operazione intera, nel caso del K7 i cicli aggiuntivi sono 3. Ecco, questo era il post corretto ![]() |
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#11 |
Senior Member
Iscritto dal: Nov 2001
Messaggi: 445
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P4 e K7 HANNO più di una pipeline ...
Oggi ho fumato troppo ![]() ![]() ![]() |
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#12 | |
Senior Member
Iscritto dal: Apr 2001
Messaggi: 2153
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Quote:
![]() Cmq non ti ho ben capito..........facendo conto che io devo eseguire una sola operazione.........nel P4 avendo 20 stadi mi ci vorrebbero si o no 20 cicli?? e nel althlon ce ne vorrebbero 10? ![]() Io intendo semplicemente eseguendo un operazione non cose più complicate o parallelismi.
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Core2Duo E6300, Asrock ConreoXfire-eSata2, 2GB DDR2-667 Team Elite CL4, PointofView 7900GS , Creative SB Audigy2 , 2HD WD2500KS-sata Raid-0, Mast Pioneer DVR-212-Sata, Inspire4.1 4400 |
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#13 |
Member
Iscritto dal: Nov 2000
Messaggi: 4
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Scusate ma...cos'è una pipeline?
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#14 | |
Senior Member
Iscritto dal: Apr 2001
Messaggi: 2153
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Quote:
__________________
Core2Duo E6300, Asrock ConreoXfire-eSata2, 2GB DDR2-667 Team Elite CL4, PointofView 7900GS , Creative SB Audigy2 , 2HD WD2500KS-sata Raid-0, Mast Pioneer DVR-212-Sata, Inspire4.1 4400 |
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#15 | |
Senior Member
Iscritto dal: Nov 2001
Messaggi: 445
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Quote:
Quel QUASI è la causa del fatto che una cpu come il P4 sia più lenta, a parità di frquenza, rispetto ad un K7. |
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#16 | |
Senior Member
Iscritto dal: Apr 2001
Messaggi: 2153
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Quote:
![]() Grazie ................l'interessante sarà vedere quale delle 2 soluzioni pagherà di più, quella della velocità del P4 oconservativa dell'Athlon. ![]()
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Core2Duo E6300, Asrock ConreoXfire-eSata2, 2GB DDR2-667 Team Elite CL4, PointofView 7900GS , Creative SB Audigy2 , 2HD WD2500KS-sata Raid-0, Mast Pioneer DVR-212-Sata, Inspire4.1 4400 |
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#17 |
Senior Member
Iscritto dal: Jan 2000
Città: Milano
Messaggi: 1034
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Per evitare confusione sottolineo il fatto che ogni ciclo del P4 è ovviamente più breve di quello di un K7... e qui sta il senso della pipeline così profonda: la frequenza sale molto e se si verificano le condizioni ottimali (molte istruzioni da eseguire, poche dipendenze, pochi salti
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#18 | |
Senior Member
Iscritto dal: Apr 2001
Messaggi: 2153
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Quote:
Sinceramente non trovo il motivo per cui la criticate tanto? ![]()
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Core2Duo E6300, Asrock ConreoXfire-eSata2, 2GB DDR2-667 Team Elite CL4, PointofView 7900GS , Creative SB Audigy2 , 2HD WD2500KS-sata Raid-0, Mast Pioneer DVR-212-Sata, Inspire4.1 4400 |
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#19 | |
Senior Member
Iscritto dal: Sep 2000
Città: lodi-crema-milano.
Messaggi: 12333
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Quote:
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La teoria è quando si sa tutto e niente funziona. La pratica è quando tutto funziona e nessuno sa il perché. Noi abbiamo messo insieme la teoria e la pratica: non c'è niente che funzioni... e nessuno sa il perché! |
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#20 | |
Senior Member
Iscritto dal: Nov 2001
Messaggi: 445
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Quote:
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Strumenti | |
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Tutti gli orari sono GMT +1. Ora sono le: 00:46.