Main Content

createJob

Create independent job on cluster

collapse all in page

    Syntax

    job = createJob(myCluster)
    job = createJob(myCluster,Name,Value)

    Description

    example

    job = createJob(myCluster) creates an independent job on the identified cluster and an independent job object on the client.

    The job’s data is stored in the location specified by the cluster’s JobStorageLocation property.

    example

    job = createJob(myCluster,Name,Value) also specifies the Profile or sets the independent job properties using one or more optional name-value arguments when creating the job. For a listing of the valid properties, see the parallel.Job object reference page.

    In you specify a Profile and other properties, the values you specify in these property name-value pairs can override the values in the profile.

    Examples

    collapse all

    Open Live Script

    Create and run a job on a cluster.

    Create an independent job object using the default profile. 

    c = parcluster;
j = createJob(c);

    Add tasks to the job.

    for i = 1:10
    createTask(j,@rand,1,{10});
end

    Run the job.

    submit(j);

    Wait for the job to finish, and retrieve the job results.

    wait(j);
out = fetchOutputs(j);

    Display the random matrix returned from the third task.

    disp(out{3})
        0.9730    0.1454    0.7662    0.9601    0.0836    0.9843    0.2656    0.8780    0.1748    0.2112
    0.7104    0.6426    0.9654    0.9145    0.6432    0.4296    0.4141    0.6507    0.7349    0.9729
    0.3614    0.3250    0.9843    0.8676    0.5964    0.1125    0.1687    0.2207    0.8327    0.7751
    0.2934    0.8229    0.9601    0.1388    0.8854    0.5494    0.1708    0.6235    0.0617    0.1119
    0.1558    0.8728    0.1856    0.2842    0.8472    0.5912    0.8205    0.3761    0.1292    0.8711
    0.3421    0.2005    0.9495    0.4687    0.8467    0.1968    0.7528    0.0899    0.8172    0.3892
    0.6071    0.9987    0.2639    0.0828    0.7554    0.7506    0.6331    0.0035    0.8602    0.4818
    0.5349    0.8446    0.1578    0.1702    0.6472    0.0087    0.8810    0.3619    0.6499    0.8299
    0.4118    0.9079    0.4784    0.5140    0.5163    0.5712    0.1639    0.7487    0.6486    0.7195
    0.1020    0.0982    0.2994    0.2809    0.4726    0.4986    0.3940    0.0096    0.3214    0.6705

    Delete the job.

    delete(j);

    Create an independent job and attach files in addition to those specified in the default profile.

    c = parcluster;
j = createJob(c,'AttachedFiles',...
        {'myapp/folderA','myapp/folderB','myapp/file1.m'});

    Input Arguments

    collapse all

    Cluster, specified as a parallel.Cluster object that represents cluster compute resources. To create the parallel.Cluster object, use the parcluster function.

    Example: myCluster = parcluster; job = createJob(myCluster);

    Data Types: parallel.Cluster

    Name-Value Arguments

    Specify optional pairs of arguments as Name1=Value1,...,NameN=ValueN, where Name is the argument name and Value is the corresponding value. Name-value arguments must appear after other arguments, but the order of the pairs does not matter.

    Before R2021a, use commas to separate each name and value, and enclose Name in quotes.

    Example: job = createJob(myCluster, 'AdditionalPaths',["/additional/path1","/additional/path2"]) creates an independent job on the cluster represented by myClusterand adds path1 and path2 folders to all the workers MATLAB® search path.

    Standard Name-Value Arguments

    collapse all

    Cluster profile with property values to apply to the job object, specified as the comma-separated pair consisting of 'Profile' and the profile name as a character vector or string. If you do not specify a profile, and the cluster has a value specified in its 'Profile' property, MATLAB automatically applies the cluster's profile. For more details about defining and applying profiles, see Discover Clusters and Use Cluster Profiles.

    Example: createJob(myCluster,'Profile',"myProfileName")

    Data Types: char | string

    Property Name-Value Arguments

    collapse all

    Paths to add to MATLAB search path of the workers that execute the job, specified as character vector, string, string array, or cell array of character vectors.

    If the client and workers have different paths to the same folder, you must specify the folder using the path on the workers. For example, if the path to the folder is /shared/data on the client and /organization/shared/data on the workers, specify "/organization/shared/data".

    If you specify relative paths such as "../myFolder", MATLAB resolves the paths relative to the current working directory on the workers.

    Example: "AdditionalPaths",["/path/to/folder1","path/to/folder2"]

    Data Types: char | string | cell

    Files and folders to attach to the job object, specified as a character vector, string, string array, or cell array of character vectors. This argument makes the identified files and folders available for the workers executing the tasks in the job.

    If you specify the Profile property, and the profile or the myCluster profile already has values for the AttachedFiles property, MATLAB appends the files and folders you specify here to the existing AttachedFiles values.

    Example: "AttachedFiles", {'data_set.m','folder_for_workers'}

    Data Types: char | string | cell

    Note

    The properties listed here are only a subset. For a full list of valid properties, see the parallel.Job object reference page.

    Tips

    When you offload computations to workers, any files that are required for computations on the client must also be available on workers. By default, the client attempts to automatically detect and attach such files. To turn off automatic detection, set the AutoAttachFiles property to false. If automatic detection cannot find all the files, or if sending files from client to worker is slow, use the following properties.

    • If the files are in a folder that is not accessible on the workers, set the AttachedFiles property. The cluster copies each file you specify from the client to workers.

    • If the files are in a folder that is accessible on the workers, you can set the AdditionalPaths property instead. Use the AdditionalPaths property to add paths to each worker's MATLAB search path and avoid copying files unnecessarily from the client to workers.

    Version History

    Introduced before R2006a

    See Also

    | | | | |

    Topics