4. Parallel Computing 14. Introduction


Figure 310: Distributed Memory Multiprocessor



Download 85,22 Kb.
Pdf ko'rish
bet22/26
Sana16.01.2022
Hajmi85,22 Kb.
#375116
1   ...   18   19   20   21   22   23   24   25   26
Bog'liq
14 Parallel Computing

Figure 310: Distributed Memory Multiprocessor

What possible advantage could a distributed memory multiprocessor have?  For one

thing, there is no contention for a common memory module. This improves performance.

On the other hand, having to go through an intermediary to get information is generally

slower than in the case of shared memory.

A related issue is known as scalability. Assuming that there is enough parallelism

inherent in the application, one might wish to put a very large number of processors to

work. Doing this exacerbates the problem of memory contention: only one processor can

access a single memory module at a time. The problem can be alleviated somewhat by

adding more memory modules to the shared memory configuration. The bottleneck then

shifts to the processor-memory communication mechanism. If, for example, a bus

interconnection is used, there is a limit to the number of memory transactions per unit

time, as determined by the bus technology. If the number of processors and memory

modules greatly exceeds this limit, there will be little point in having multiple units. To

overcome the bus limitation, a large variety of multi-stage interconnect switches have

been proposed. A typical example of such a switch is the butterfly interconnection, as

shown below.

P

P



P

P

P



P

P

P



M

M

M



M

M

M



M

M

S



S

S

S



S

S

S



S

S

S



S

S


Download 85,22 Kb.

Do'stlaringiz bilan baham:
1   ...   18   19   20   21   22   23   24   25   26




Ma'lumotlar bazasi mualliflik huquqi bilan himoyalangan ©hozir.org 2024
ma'muriyatiga murojaat qiling

kiriting | ro'yxatdan o'tish
    Bosh sahifa
юртда тантана
Боғда битган
Бугун юртда
Эшитганлар жилманглар
Эшитмадим деманглар
битган бодомлар
Yangiariq tumani
qitish marakazi
Raqamli texnologiyalar
ilishida muhokamadan
tasdiqqa tavsiya
tavsiya etilgan
iqtisodiyot kafedrasi
steiermarkischen landesregierung
asarlaringizni yuboring
o'zingizning asarlaringizni
Iltimos faqat
faqat o'zingizning
steierm rkischen
landesregierung fachabteilung
rkischen landesregierung
hamshira loyihasi
loyihasi mavsum
faolyatining oqibatlari
asosiy adabiyotlar
fakulteti ahborot
ahborot havfsizligi
havfsizligi kafedrasi
fanidan bo’yicha
fakulteti iqtisodiyot
boshqaruv fakulteti
chiqarishda boshqaruv
ishlab chiqarishda
iqtisodiyot fakultet
multiservis tarmoqlari
fanidan asosiy
Uzbek fanidan
mavzulari potok
asosidagi multiservis
'aliyyil a'ziym
billahil 'aliyyil
illaa billahil
quvvata illaa
falah' deganida
Kompyuter savodxonligi
bo’yicha mustaqil
'alal falah'
Hayya 'alal
'alas soloh
Hayya 'alas
mavsum boyicha


yuklab olish