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Problem Description

This solution describes how to launch a parametric sweep, a batch sweep, or a cluster sweep simulation in COMSOL Multiphysics® from the command line.

Solution

Short Summary

Model methods are presented as a concept to modify Parametric Sweep, Batch Sweep, and Cluster Sweep nodes by, for example reading parameter cases from files. The -mode desktop option can be used to run Batch Sweep and Cluster Sweep nodes from the command line and to obtain synchronized solutions and synchronized accumulated probe tables in the output file.

Framework

COMSOL Multiphysics® offers various possibilities to control and run parameter sweeps in sequential and in distributed mode:

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Parametric Sweep

The Parametric Sweep feature in COMSOL Multiphysics® is used to run a parametric study with several parameter cases in a single instance of COMSOL Multiphysics®. The parameter cases are typically handled one after the other and all compute resources (processes and cores) assigned to the single COMSOL Multiphysics® instance are used. The Parametric Sweep node is controlling the parameter ranges of the corresponding parametric study. You can run the study either from the GUI or from the command line, for example by specifying the flag -std as an option for the COMSOL batch call. The solutions in the study are either available as parametric values in the solution sequence (if the Parametric Solver is used), or under a Parametric Solutions node (if an outer sweep with an additional Parametric Sweep node under Job Configurations is used; see the figure below).

See Performing a Parametric Sweep Study in COMSOL Multiphysics® for a video instruction of how to set up a Parametric Sweep.

Distributed Parametric Sweep

If the Parametric Sweep study is run in a distributed memory parallel environment

• as a Parametric Sweep node combined with a Cluster Computing node in a study,
• or in a distributed GUI instance, for example launched by comsol -nn 4 -nnhost 4 (no Cluster Computing node is required in this case),
• or in a cluster job launched by a submission script for the scheduler,

you can use the Distribute parametric sweep option in the Study Extension section of the Parametric Sweep (or the Distribute parametric solver option of a Stationary study step). With this option enabled, the parameter cases of the Parametric Sweep are distributed across the running compute processes. When running, for example four parameter cases on two nodes, each node will handle two parameter cases and the nodes are accomplishing their work simultaneously. The parametric solutions for all parameters are available in the output file (from a batch run) or in the GUI (for an interactive distributed COMSOL instance).

Batch Sweep

The Batch Sweep — in contrast to the Parametric Sweep — is using multiple COMSOL batch instances to process the parameter cases. The instances are launched as external batch jobs from a Batch Sweep study run in the GUI. These jobs are running independently of each other and in case of a failure in one job, the other jobs and their results are not affected. The results are stored in the corresponding output files. In addition, there are options to Synchronize solutions and to Synchronize accumulated probe table in the Batch Settings section of the Batch Sweep node. With the Synchronize solutions option, the parametric solutions of all jobs will be available in the model in the GUI for postprocessing.

Batch Sweeps automatically adjust the number of cores used to an optimal value, but you can also set the resources for the jobs manually. If an external job should use only a subset of the available cores, you can set the Number of cores per job (can be set on the Batch node under Job Configurations; see the figure below) and the Number of simultaneous jobs (can be set on the Batch Sweep node). The product of these two values should not exceed the number of available cores.

Additional information on Batch Sweeps can be found in the blog The Power of the Batch Sweep.

Cluster Sweep

A Cluster Sweep provides the same functionality as a Batch Sweep plus interfaces for cluster computing settings and remote and cloud access. You can configure the external jobs for distributed execution in a cluster environment. The options Synchronize solutions and Synchronize accumulated probe tables are available in the Batch Settings section of the Cluster Sweep node as well. The usage and the configuration of a Cluster Sweep node is described in the blog post How to use the Cluster Sweep Node in COMSOL Multiphysics®.

NOTE: A Floating Network License (FNL) is required to run COMSOL Multiphysics® in distributed memory parallel mode. This applies for example to studies with a Cluster Computing node (for a distributed Parametric Sweep), studies with a Cluster Sweep node, or to distributed GUI instances with a distributed Parametric Sweep (see Running COMSOL® in parallel on clusters for a description of the modes of cluster execution).

Running a parametric sweep from the command line

A study containing a Parametric Sweep node can be run from the command line, for example by invoking

and in case of a distributed Parametic Sweep, for example by launching

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In both cases, the Parametric Sweep is running as is; that is, it runs with the parameter values stored in the Parametric Sweep node in the model.

If you want to prescribe the set of parameters for a sweep from the command line, you can instead disable the Parametric Sweep node in the model file and use the flags -pname and -plist to set the parameters by command-line input or you can read the parameters from a file using the -paramfile flag. If you use these command-line approaches, a different output file is generated for each parameter case and the solutions are not synchronized to a single file.

An example application from the application library with a Parametric Sweep is the Tuning Fork. This model determines the fundamental resonant frequency of a tuning fork where the prong length L is varied in the parametric sweep. You can call this model (having the Parametric Sweep disabled in the GUI) from the command line for a given parameter range by invoking, for example

in order to sweep over the parameters L=8[cm], 10[cm], and 12[cm] (resulting in an output file for each parameter). For a space-separated parameter file paramfile.dat, which contains the parameter names in the first row and the corresponding parameter value tuples in the following rows, for example

the call for a parameter-file controlled parameter sweep may look like

Controlling a Parametric Sweep by a model method

Another option for controlling a Parametric Sweep from the command line is to use a model method for reading the desired parameters from an input file. In the following example, the model method reads the input file and extracts the parameter names, the parameter values, and the parameter units. The extracted values are used to set the corresponding properties on the Parametric Sweep node. Finally, the Parametric Sweep is done by running the Parametric Sweep subnode under Job Configurations (assuming this node has been created before, for example by running the study in the GUI). The following example code can be used to define a new model method in the Application Builder:

See How to Use Model Methods to Accelerate Your COMSOL Workflow for an introduction to model methods. In the Model Builder you can add a method call to the previously defined model method under Global Definitions by selecting Add Method Call on the Developer tab. You can test the model method by right-clicking the Modelmethod1 node and selecting Run.

The parameter file pfile.csv is a comma-separated text file where the first line contains the parameter names (L), the second line contains the units for the parameter columns (cm), and the third to n-th lines contain the parameter values for this parameter's column (8, 10).

With this configuration the Parametric Sweep can be run from the command line by calling the model method

with the additional flag -methodcall methodcall1. The parameters in the sweep are those defined in the parameter file loaded by the model method. If you want to run several sweeps for different parameter files, the model method can be modified to load several parameter files and to run several sweeps in a row, or you can define several model methods that are called in consecutive runs from the command line. A nested loop of parameters is automatically set up and used when the parameter file contains multiple columns (the parameters need to be defined in the study).

If the Parametric Sweep uses the Parametric Solver (see the figure below), the model method needs to run the corresponding solver sequence, that is, the line (**) needs to be replaced by

NOTE: The Application Builder is supported in the Windows® operating system.

Running a Batch Sweep or a Cluster Sweep from the command line

If you have a study with a Batch Sweep or a Cluster Sweep and you run the study in batch mode from the command line, the Batch Sweep and the Cluster Sweep nodes are ignored by default. If you want to run these nodes as well (that is, if you want to allow the batch process to launch external processes), you have to add the flag -mode desktop to the batch call on Windows

and

on Linux or MacOS (in version 5.3a you have to use -batch off on Linux / MacOS instead of -mode desktop).

In both cases, the Batch Sweep or the Cluster Sweep are run as is, that is, with the parameters defined inside the model file. If the options Synchronize solutions or Synchronize accumulated probe table are checked, the synchronizations are performed in the same way as in a run from the GUI. The big plus of this command-line approach is that it allows you to obtain an outputfile with synchronized solutions from all external jobs for further postprocessing.

If you want to hand over the parameters for the Batch Sweep or the Cluster Sweep by a parameter file that is read by a variant of the presented model method, you need to modify the line (*) in the above example and define How to hack winrar password using cmd.

for a Batch Sweep and

for a Cluster Sweep. In addition, the line (**) needs to be replaced by the lines

Here, it is assumed that the corresponding study has already been run in the GUI, and that the Parametric Sweep node p1 and the Batch node b1 under Job Configurations have already been generated. In addition, it is assumed that there are two old external process nodes to be removed before the new ones will be generated.

For launching the Batch Sweep or the Cluster Sweep controlled by the model method you have to invoke

on Windows or

on Linux or MacOS (use -batch off in version 5.3a instead of -mode desktop).

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The School of Public Health MPH Program offers two options for students: a traditional four-semester MPH program offered in-person or online, and an accelerated program available for completion within 12 months. As our School is a CEPH accredited institution, students are eligible to take the CPH exam upon completion of their MPH core courses.

Concentrations

Degree Requirements

• Students enrolled in the MPH program must complete a total of 42 credit hours. This includes:
  • 18 hours of core courses
  18 hours of concentration/elective courses
  • if a concentration is chosen: 12 hours of concentration courses and 6 hours of electives
  • 3 hours of practicum/field experience
  • 3 hours of thesis or master's project
• Graduate students must maintain a 3.0 GPA (“B”). Grades of “D” and “F” will not apply toward any graduate degree, but will be computed in the GPA. No more than 7 hours of “C-“, “C,” or “C+” will be applied towards meeting degree requirements.
• All requirements for the MPH degree must be completed in 8 calendar years.

Tuition and Fees

For the most current information regarding tuition, visit the University & Student Business Services' Fee Chart.

Contact Us

For frequently asked questions about the MPH program, please visit our MPH FAQ.