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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]




runrtdetach.mos

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

   file runrtdetach.mos
   ````````````````````
   Running a submodel on a remote machine,
   retrieve information about the submodels detaching
   themselves from their parent model.

   Before running this model, you need to set up the 
   NODENAME with a machine name/address of your local network.
   The node that is used needs to have the same version of
   Xpress installed and suitably licensed, and the server 
   "xprmsrv" must have been started on this machine.
       
   (c) 2014 Fair Isaac Corporation
       author: S. Heipcke, Feb. 2014
*******************************************************!)

model "Run model rtparams4 remotely"
 uses "mmjobs", "mmsystem"

 declarations
  modPar: Model
  mosInst: Mosel
  event: Event
 end-declarations
                                   ! Compile the model file
 if compile("rtparams4.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

                                   ! Redirect streams (elsewhere than main)
 setdefstream(mosInst, "null:", string(expandpath("rt4log.txt")), "sysfd:2")

                                   ! Load the bim file into the remote instance
 load(mosInst, modPar, "rmt:rtparams4.bim") 
 fdelete("rtparams4.bim")
                                   ! Start model execution
 run(modPar, "PARAM1=" + 2 + ",PARAM2=" + 3.4 + 
             ",PARAM3='a string'" + ",PARAM4=" + true)
 wait                              ! Wait for model termination

 event:=getnextevent               ! An event is available
 if getclass(event) = EVENT_END then
   writeln("Termination event received.")
 else
   writeln("Event received: ", event) 
 end-if
 
 if getstatus(modPar) = RT_DETACHED then
   writeln("Submodel 'rtparams4' detached.")
 end-if

end-model
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