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MPI and Grid Computing

This article discusses MPICH-G2, a sophisticated implementation of the MPI standard tailored for grid computing environments. Building upon the functionalities of MPICH and MPICH-G, MPICH-G2 integrates the Globus Toolkit to facilitate seamless communication, job control, and resource management across heterogeneous systems. Key features include authentication, executable staging, and management of standard input/output redirection. The document also explores the enhancements in collective communication operations that address the challenges posed by grid environments, making MPICH-G2 a vital tool for distributed parallel processing.

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MPI and Grid Computing

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  1. MPI and Grid Computing UNC-Wilmington, C. Ferner, 2008 Nov 4, 2008

  2. MPICH-G2 • MPICH is an implementation of the standard MPI • MPICH-G is an implementation of MPI that uses the Globus Toolkit • MPICH-G2 is a complete redesign and reimplementation of MPICH-G

  3. MPICH-G2 • MPICH-G2 hides heterogeneity by using the Globus Toolkit for • authentication • authorization • exectutable staing • process control • communication • redirection of standard input and output • remote file access

  4. % grid-proxy-init% mpirun -np 6 myprog Generates RSL MDS mpirun GASS globusrun Submits multiple jobs Authenticates, Coordinates Startup DUROC GRAM GRAM GRAM Initiates Job, Detects Termination fork Condor SGE Process Control P0 P1 P2 P3 P4 P5

  5. + ( &(resourceManagerContact="m1.utech.edu") (count=10)‏ (jobtype=mpi)‏ (label="subjob 0")‏ (environment=(GLOBUS_DUROC_SUBJOB_INDEX 0))‏ (directory=/homes/users/smith)‏ (executable=/homes/users/smith/myapp)‏ )‏ ( &(resourceManagerContact="m2.utech.edu") (count=10)‏ (label="subjob 1")‏ (environment=(GLOBUS_DUROC_SUBJOB_INDEX 1))‏ (directory=/homes/users/smith)‏ (executable=/homes/users/smith/myapp)‏ )‏ ( &(resourceManagerContact="c1.nlab.gov") (count=10)‏ (jobtype=mpi)‏ (label="subjob 2")‏ (environment=(GLOBUS_DUROC_SUBJOB_INDEX 2))‏ (directory=/users/smith)‏ (executable=/users/smith/myapp)‏ )‏ RSL • mpirun will generate the RSL or one can create/provide the RSL • This is RSL version 1 (not XML)‏

  6. Topology Site A Site B Shared-Memory Cluster 1 Cluster 2 • Early implementations of MPI's collective communication operations assumed all processes were equidistant from on another. • This assumption is unlikely in a Grid environment 0 1 4 5 8 9 2 3 6 7 10 11

  7. Topology • Use the concept of Communicators, MPICH-G2 collective communication operations are topology-aware. • It uses the concept of “levels” and “colors”

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