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Introduction to Charm++ Machine Layer

Introduction to Charm++ Machine Layer. Gengbin Zheng Parallel Programming Lab 4/3/2002. Machine Layer Overview. Startup and initialization; Low level communication CmiFreeSendFn, etc CmiSyncBroadcastAllFn(), etc SMP support Multiple worker threads and one comm thread;

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Introduction to Charm++ Machine Layer

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  1. Introduction toCharm++ Machine Layer Gengbin Zheng Parallel Programming Lab 4/3/2002

  2. Machine Layer Overview • Startup and initialization; • Low level communication • CmiFreeSendFn, etc • CmiSyncBroadcastAllFn(), etc • SMP support • Multiple worker threads and one comm thread; • Thread creation and state initialization;

  3. Supported Platforms Charm version OS Communication Compiler ------------------- --------- ------------------- -------------------- net-linux PC Linux UDP/Myrinet GNU compiler net-linux-ia64 IA64 Linux UDP/Myrinet GNU compiler net-axp Alpha UDP GNU compiler net-cygwin Win32/cygwin UDP GNU compiler net-win32 Win32 UDP MS Visual C++ net-sol Solaris UDP GNU compiler net-irix IRIX UDP GNU compiler net-hp HP-UX UDP GNU compiler net-ppc-darwin MacOS X UDP GNU C++ compiler mpi-linux PC Linux MPI GNU compiler mpi-linux-ia64 IA64 Linux MPI GNU compiler mpi-axp Alpha MPI GNU compiler mpi-linux-axp Alpha Linux MPI GNU compiler mpi-origin Origin2000 MPI C++ compiler mpi-sp AIX MPI AIX xlC Compiler origin2000 Origin2000 shared-mem SGI C++ compiler t3e Cray T3E shared-mem Cray C++ compiler

  4. Communication API (Send/Recv) MPI Net Shmem UDP (machine-eth.c) TCP (machine-tcp.c) Myrinet (machine-gm.c) Communication Architecture

  5. Machine Layer Files Layout • Configuration files for each main platform: • conv-mach.h • conv-common.h • conv-mach-opt.h from: • smp, scyld, bluegene, gm, vmi, tcp … • cc, cxx, kcc, cc64, acc, ecc … • Implementations: • common.net, common.mpi, common.shmem • machine.c

  6. How ‘build’ works • build charm++ net-linux gm smp kcc bluegene • Sort gm, smp and bluegene • Mkdir net-linux-bluegene-gm-smp-kcc • Cat conv-mach-[kcc|bluegene|gm|smp].h to conv-mach-opt.h • Cat conv-mach-[kcc|bluegene|gm|smp].sh to conv-mach-opt.sh • Gather files from common.net, etc (Makefile) • Make charm++ under • net-linux-bluegene-gm-smp-kcc/tmp

  7. Parallel Program Startup • Net version - nodelist Rsh/ssh (IP, port) Rsh/ssh (IP, port) Charmrun node compute node compute node my node (IP, port) Broadcast all nodes (IP, port)

  8. Converse life • ConverseInit • Global variables initialization; • Start worker threads; • ConverseRunPE for each Charm PE • Per thread initialization; • Loop into scheduler: CsdScheduler()

  9. handler xhandler Dgram Header length Message formats • Net version #define CMK_MSG_HEADER_BASIC { CmiUInt2 d0,d1,d2,d3,d4,d5,hdl,d7; } • MPI version #define CMK_MSG_HEADER_BASIC { CmiUInt2 rank, root, hdl,xhdl,info,d3; } rank root handler xhandler info d3

  10. SMP support • MPI-smp as an example • Create threads: CmiStartThreads • Worker threads work cycle • See code in mahcine-smp.c • Communication thread work cycle • See code in machine-smp.c

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