Shared Virtual Memory Systems Based On SCI

This　thesis　introduces　SVM　systems ( also　known　as　SoftwareDistributed　Shared　Memory　systems,　Software　DSM)　briefly,　and　analyzesits　behavior　of　communication　in-depth.　Through　SCI's　API　SISCI,thisthesis　redesigns　JIAJIA's　communication　module,　tests　and　analyzesrealized　system's　performance,draws　some　conclusions.SCI　standard　describes　a　physical　interlinkage　protocol　and　a　kindof　media　based　on　the　protocol.　SCI(Scalable　Coherent　Interface)　extendsusual　mainboard　bus　into　Full-duplex　point-to-point　Transmissionsinterlinkage　ones　,and　it　offers　low　delay　and　high　bandwidthcommunication　and　distributed　sharing　memory-mapped.Most　SVM's　communication　module　based　on　TCP/IP　which　use　Socketcommunication　library,　overhead　of　software　and　hardware　are　very　huge.Apparently,　reducing　SVM's　communication　overhead　needs　more　performancecommunication　library.　So　This　thesis　introduces　SCI's　high　performancecommunication　to　SVM　JIAJIA.　Through　SCI's　API　SISCI,this　thesisredesigns　JIAJIA's　communication　module,And　tests　and　analyzes　realizedsystem's　performance　,as　results　show,JIAJIA　based　on　SCI　throw　out　veryhigh　performance.In　performance　analysis,　this　thesis　advances　a　index　named　net-speedup　used　by　estimate　system　performance　worked　on　by　communication.This　thesis　analyzes　the　behavior　and　communication　distributing　ofbench-marks　and　system　performance　worked　on　by　performance　of　networkthrough　Amdahl　law　and　net-speedup.Compared　with　time　spend　on　net　communication,　Overhead　of　SVM　onlittle　message　is　much　larger　than　that　on　large　message.　And　comparedwith　Ethernet,　the　enhancement　performance　of　large　message　isapparently　more　than　that　of　little　message　in　SCI　net.　So　this　thesisasserts　that　along　with　the　performance　enhancement　of　network,　theoverhead　of　little　　message　will　be　restriction　of　JIAJIA's　performanceenhancement　in　JIAJIA's　present　communication　pattern.