copyFileFromStore - Copy files from FileStore object to local file

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Copy files from FileStore object to local file system

Since R2022a

Syntax

Description

copyFileFromStore([store](#mw%5Fdf9a1c26-bfaf-4cb0-a927-60658aea080f),[keySet](#mw%5F15fb15dc-97cd-40bb-a8e6-6864f1891077),[fileSet](#mw%5Fc1501bec-a6dd-4848-ac30-1c19ef1877bf)) copies files from store as specified by the keyskeySet to the local file system fileSet.

example

Examples

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Run a simulation on a parallel pool of process workers and retrieve the file storage on a client. The file storage is a FileStore object with key-file entries. Copy files from this object as specified by their corresponding keys using the copyFileFromStore function.

The following simulation finds the average and standard deviation of random matrices and stores the results in the FileStore object.

function workerStatsCode(models) % Get the FileStore of the current job store = getCurrentFileStore; for i = 1:numel(models) % Compute the average and standard deviation of random matrices A = rand(models(i)); M = mean(A); S = std(A); % Save simulation results in temporary files sourceTempFile = strcat(tempname("C:\myTempFolder"),".mat"); save(sourceTempFile,"M","S"); % Copy files to FileStore object as key-file pairs key = strcat("result_",num2str(i)); copyFileToStore(store,sourceTempFile,key); end end

Start a parallel pool of process workers.

pool = parpool('Processes');

Starting parallel pool (parpool) using the 'Processes' profile ... Connected to the parallel pool (number of workers: 6).

Get the FileStore for this pool.

Run the simulation on the pool.

models = [4,8,32,20]; future = parfeval(@workerStatsCode,0,models); wait(future);

Show the keys of the FileStore object.

ans = 4×1 string "result_1" "result_2" "result_3" "result_4"

Copy files from the file storage as specified by the corresponding keys "result_1" and "result_2" to the local files "run_1.mat" and "run_2.mat".

copyFileFromStore(store,["result_1" "result_2"],["run_1.mat" "run_2.mat"])

Display all the information on the variables stored in the local files.

Name Size Bytes Class Attributes

M 1x4 32 double
S 1x4 32 double

Name Size Bytes Class Attributes

M 1x8 64 double
S 1x8 64 double

Input Arguments

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File storage shared by MATLAB clients and workers, specified as a FileStore object.

Keys to copy, specified as a character vector, string scalar, string array, or cell array of character vectors or strings. keySet andfileSet must have the same number of elements.

Example: ["myDataKey" "myLogKey"]

Local files, specified as a character vector, string scalar, string array, or cell array of character vectors or strings. keySet andfileSet must have the same number of elements.

Example: ["/data/run.mat" "/tmp/run_log.txt"]

Version History

Introduced in R2022a