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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'.

runrtpar.zip[download all files]

Source Files
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runtestsub.mos[download]
testsub.mos[download]
runsubevnt.mos[download]
runsubevnt2.mos[download]
testsubev.mos[download]
runsubwait.mos[download]
runsubmem.mos[download]
runrtparam.mos[download]
runrtparam2.mos[download]
rtparams.mos[download]
runrtparseq.mos[download]
runrtparprl.mos[download]
runrtparclone.mos[download]
runrtparqueue.mos[download]
runsubshm.mos[download]
testsubshm.mos[download]
runsubshmr.mos[download]
testsubshmr.mos[download]
runsubpip.mos[download]
testsubpip.mos[download]
runsubclone.mos[download]
findservers.mos[download]
runrtdistr.mos[download]
runrtdistrconf.mos[download]
runrtpardistr.mos[download]
rtparams3.mos[download]
runrtparqueued.mos[download]
runrtpartree.mos[download]
rtparams2.mos[download]
runrtdetach.mos[download]
rtparams4.mos[download]
runsubshmdistr.mos[download]




runsubshmdistr.mos

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

   file runsubshmdistr.mos
   ```````````````````````
   Running a model on a remote machine.
   Communication of data to/from submodel
   using 'shmem' IO driver with 'bin' and 'rmt'.
       
   (c) 2017 Fair Isaac Corporation
       author: S. Heipcke, June 2017
*******************************************************!)

model "Run model testsubshm remotely"
 uses "mmjobs"

 declarations
  mosInst: Mosel
  modSub: Model
  A = 30..40 
  B: array(A) of real
  nd: integer
 end-declarations
                                   ! Compile the model file
 if compile("testsubshm.mos")<>0 then exit(1); end-if

       !!! Use the name or IP address of a machine in
       !!! your local network, or "" for current node
 NODENAME:= ""
                                   ! Open connection to a remote node:
 if connect(mosInst, NODENAME)<>0 then exit(2); end-if
 nd:=mosInst.node
                                   ! Load the bim file into the remote instance
 load(mosInst, modSub, "rmt:[-1]testsubshm.bim")

                                   ! Write data onto the instance of the submod.
 initializations to "bin:rmt:["+nd+"]shmem:indata"
  A
 end-initializations

 run(modSub)                       ! Start model execution
 wait                              ! Wait for model termination
 dropnextevent                     ! Ignore termination event message

 initializations from "bin:rmt:["+nd+"]shmem:resdata"
  B
 end-initializations

 writeln(B)
 
end-model
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