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Working with multiple models: submodels, coordination, communication, and parallelization

Description
The Mosel module mmjobs enables the user to work with several models concurrently. We show here a series of examples of basic tasks that typically need to be performed when working with several models in Mosel:

Parallel computing:
  • Running a submodel from another Mosel model: runtestsub.mos (main model executing testsub.mos)
  • Retrieving termination status from submodels (means of coordination of different models): runsubevnt.mos (main model executing testsub.mos)
  • Retrieving user event sent by the submodel: runsubevnt2.mos (main model executing testsubev.mos)
  • Stopping a submodel: runsubwait.mos (main model executing testsub.mos)
  • Compiling to memory: runsubmem.mos (main model executing testsub.mos)
  • Setting runtime parameters: runrtparam.mos (main model executing rtparams.mos)
  • Sequential execution of submodels: runrtparseq.mos (main model executing rtparams.mos)
  • Parallel execution of submodels: runrtparprl.mos (main model executing rtparams.mos)
  • Parallel execution with cloning of submodels: runrtparclone.mos (main model executing rtparams.mos)
  • Job queue for parallel execution of submodels: runrtparqueue.mos (main model executing rtparams.mos)
  • Using the shmem (shared memory) I/O driver for data exchange (bin format): runsubshm.mos (main model executing testsubshm.mos)
  • Using the shmem (shared memory) I/O driver for data exchange (raw format): runsubshmr.mos (main model executing testsubshmr.mos)
  • Using the mempipe (memory pipe) I/O driver for data exchange: runsubpip.mos (main model executing testsubpip.mos)
  • Sharing data between cloned models: runsubclone.mos (main model executing a copy of itself)
Distributed computing:
  • Check for available remote Mosel servers: findservers.mos
  • Run a single model on a remote machine: runrtdistr.mos (main model executing rtparams.mos)
  • Run a single model on a remote machine with configuration options: runrtdistrconf.mos (main model executing rtparams.mos)
  • Running parallel submodels in a distributed architecture: runrtpardistr.mos (main model executing rtparams3.mos)
  • Queuing submodels for parallel execution in a distributed architecture with one or several models per node: runrtparqueued.mos (main model executing rtparams3.mos)
  • 3-level tree of (parallel) submodels: runrtpartree.mos (main model executing rtparams2.mos)
  • Running a submodel that detaches itself from its parent: runrtdetach.mos (main model executing rtparams4.mos)
  • Using the shmem (shared memory) I/O driver for data exchange (bin format): runsubshmdistr.mos (main model executing testsubshm.mos)
Further explanation of this example: Xpress Whitepaper 'Multiple models and parallel solving with Mosel', Section 'Basic tasks'.


Source Files





rtparams2.mos

(!*******************************************************
   Mosel Example Problems 
   ======================

   file rtparams2.mos
   ``````````````````
   Model with different runtime parameter types;
   can be run as submodel from model 'runrtpartree.mos'.
       
   (c) 2010 Fair Isaac Corporation
       author: S. Heipcke, May 2010
*******************************************************!)

model "Runtime parameters"
 uses "mmjobs", "mmsystem"
 
 parameters
  LEVEL = 0
  BRANCH = 0
  MODCOUNT = 1
  PARAM1 = 0
  PARAM2 = 0.5
  PARAM3 = ''
  PARAM4 = false
 end-parameters

! wait(1)
 writeln(" "*LEVEL, LEVEL, "/", BRANCH, " (", MODCOUNT, ")", ": ", PARAM1, "  ", PARAM2, "  ", PARAM3, "  ", PARAM4)
 
end-model 

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