Re: Multiprocessingy

From: Matus Uhlar <uhlar@CCNEWS.KE.SANET.SK>
Subject: Re: Multiprocessingy
Date: Wed, 13 Mar 1996 08:11:44 +0100

Next Article (by Subject): Re: Multiprocessingy Michal Kratky
Previous Article (by Subject): Re: Multiprocessingy MARTIN HRUBY
Top of Thread: Multiprocessingy Petr Slegr
Next in Thread: Re: Multiprocessingy Michal Kratky
Articles sorted by: [Date] [Author] [Subject]

At 12 Mar 1996 08:28:48 +0100 MARTIN HRUBY (M.HRUBY%ZLIN.VUTBR.CZ@earn.cvut.cz)
 wrote:
-> > > muze mi nekdo vysvetlit rozdil mezi symetrickym a (masivne) paralelnim m.
 
-> V jednom CW byl symetricky multiprocessing definovan tak, ze kdyz
-> pridate do jednoprocesoroveho stroje dalsi procesor, musi se vykon
-> zvednout o 100% a odpovidajicim zpusobem se vykon musi zvysovat,
-> budete-li pridavat dalsi CPU.
 
Ten druhy bol asi ten klasicky ktory budeme poznat z nasich masin,
pridanie dalsieho procesora (rovnakeho) prida 80% vykonu ktory pridal dalsi
procesor...
 
viac casu sa spotrebuje na reziu a semafory. Bohuzial je to vacsinou tak.
Tymto sposobom sa neoplati prepajat privela procesorov pretoze cena skoro
prevysi vykon...tu je pomer poctu procesorov/vykonu
 
pproc:  2       3       4       5       6       7       8
vykon:  180     244     295.2   336.16  368.92  395.12  416.08
 
Ako vidite, viac ako 4 procesory sa pri tomto koeficiente neoplati davat...
Presne to cislo (80% ???) samozrejme neviem, asi sa bude lisit podla typu
procesoru. keby bol koeficient 0.9
 
pproc:  2       3       4       5       6       7       8       9
vykon:  190     271     343.9   409.51  468.55  521.68  569.49  612.51
 
tu sa to oplati trochu viac...ale co uz, 100% narast je 100% narast
 
ked maju CRAYe takych 256 procesorov, asi to nebude tento pripad :)
samozrejme na to treba uz uplne iny system, aj operacny, aj sposob
programovania...
--
 Matus Uhlar, sysadm at Regional node of SANET in Kosice, Slovakia
 E-mail: Matus.Uhlar@tuke.sk   WWW: http://www.tuke.sk/users/uhlar
 IRC: fantomas, uhlar   PGP: finger uhlar@ccnews.ke.sanet.sk | pgp
 ...MS Win's are SHIT, donut use it !

Next Article (by Subject): Re: Multiprocessingy Michal Kratky
Previous Article (by Subject): Re: Multiprocessingy MARTIN HRUBY
Top of Thread: Multiprocessingy Petr Slegr
Next in Thread: Re: Multiprocessingy Michal Kratky
Articles sorted by: [Date] [Author] [Subject]

Go to listserv.cesnet.cz LWGate Home Page.