DSM Perspective: Another Point of View
نویسندگان
چکیده
Distributed shared memor~~ r~otnp~ters (DSM’s) l7ave arrilvd [4/, 151 to challenge mai@ames. DSM’s scale to 128 ~3rocessors with tMv to eight p\‘oc’essor nodes. As skared memory mlrlti~3l.oc.c’.~sors (SMP’s), DSM’s provide a singk system imug<, and muintain a “sl7ared e~~eryt17incg” model. Large-sc,ale UNIX servers using the SMP arcl7itectm.e c,halienge mait7jkame.s in legaqv use and applications. These Izaw up to 64 processors and a more unifi3rm n7enwy uc’cess. In contrast, clusters both cvmpietnent artd compete with SMP’s and DSM’s. k7g u “shared notl7ing” model. Clusters built ,fhn commodity computers. sH,itches, und operating systems scule to ain7ost urhitrary sizes at loti,er cost while trading qf SMP’s single system imuge. Cluster-s arc required ,f;3r hi<gh uvuiluhility q3plicutions. Highest per:formanc,e scient[jic computers USC the cluster (or MPP’ ) upprouch. High growth markets, e.g., Internet serl’er-s, online transmission processing (OLTP), and dutuhase systen7s (‘an ail use cliksters. The mainline jkture of DSM may be questionable becuux. snruli SMP’s UW not as c’ost ejjectivc unless built,fkn c,ommodity cvmponents; large SMP’s can he built withc3at the DSM approuch; and c.1uster.s are a c,ost-c~~~~~~,ti,,~~ ulternuti~vjkr most al3piicutions to SMP‘s. inc,luding DSM’s, for a Mide scaling range. Nel~ertheiess, commerr~iui DSM’s are bein(q introduc~ed that compete w’ith SMP’s over a broud range.
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