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Apache-2.0\n\nCopyright (c) 2018 The Stdlib Authors.\n\nLicensed under the Apache License, Version 2.0 (the \"License\");\nyou may not use this file except in compliance with the License.\nYou may obtain a copy of the License at\n\n   http://www.apache.org/licenses/LICENSE-2.0\n\nUnless required by applicable law or agreed to in writing, software\ndistributed under the License is distributed on an \"AS IS\" BASIS,\nWITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\nSee the License for the specific language governing permissions and\nlimitations under the License.\n\n--\u003e\n\n\n\u003cdetails\u003e\n  \u003csummary\u003e\n    About stdlib...\n  \u003c/summary\u003e\n  \u003cp\u003eWe believe in a future in which the web is a preferred environment for numerical computation. To help realize this future, we've built stdlib. stdlib is a standard library, with an emphasis on numerical and scientific computation, written in JavaScript (and C) for execution in browsers and in Node.js.\u003c/p\u003e\n  \u003cp\u003eThe library is fully decomposable, being architected in such a way that you can swap out and mix and match APIs and functionality to cater to your exact preferences and use cases.\u003c/p\u003e\n  \u003cp\u003eWhen you use stdlib, you can be absolutely certain that you are using the most thorough, rigorous, well-written, studied, documented, tested, measured, and high-quality code out there.\u003c/p\u003e\n  \u003cp\u003eTo join us in bringing numerical computing to the web, get started by checking us out on \u003ca href=\"https://github.com/stdlib-js/stdlib\"\u003eGitHub\u003c/a\u003e, and please consider \u003ca href=\"https://opencollective.com/stdlib\"\u003efinancially supporting stdlib\u003c/a\u003e. We greatly appreciate your continued support!\u003c/p\u003e\n\u003c/details\u003e\n\n# Parallel\n\n[![NPM version][npm-image]][npm-url] [![Build Status][test-image]][test-url] [![Coverage Status][coverage-image]][coverage-url] \u003c!-- [![dependencies][dependencies-image]][dependencies-url] --\u003e\n\n\u003e Execute scripts in parallel.\n\n\u003csection class=\"installation\"\u003e\n\n## Installation\n\n```bash\nnpm install @stdlib/utils-parallel\n```\n\nAlternatively,\n\n-   To load the package in a website via a `script` tag without installation and bundlers, use the [ES Module][es-module] available on the [`esm`][esm-url] branch (see [README][esm-readme]).\n-   If you are using Deno, visit the [`deno`][deno-url] branch (see [README][deno-readme] for usage intructions).\n-   For use in Observable, or in browser/node environments, use the [Universal Module Definition (UMD)][umd] build available on the [`umd`][umd-url] branch (see [README][umd-readme]).\n-   To use as a general utility for the command line, install the corresponding [CLI package][cli-section] globally.\n\nThe [branches.md][branches-url] file summarizes the available branches and displays a diagram illustrating their relationships.\n\nTo view installation and usage instructions specific to each branch build, be sure to explicitly navigate to the respective README files on each branch, as linked to above.\n\n\u003c/section\u003e\n\n\u003csection class=\"usage\"\u003e\n\n## Usage\n\n```javascript\nvar parallel = require( '@stdlib/utils-parallel' );\n```\n\n#### parallel( files, \\[options,] clbk )\n\nExecutes scripts in parallel.\n\n\u003c!-- FIXME: revert back to JavaScript once can handle errors --\u003e\n\n\u003c!-- run-disable --\u003e\n\n```text\nvar files = [\n    './a.js',\n    './b.js'\n];\n\nfunction done( error ) {\n    if ( error ) {\n        console.error( 'Exit code: '+error.code );\n        console.error( 'Signal: '+error.signal );\n        throw error;\n    }\n    console.log( 'Done!' );\n}\n\nparallel( files, done );\n```\n\nThe function accepts the following `options`:\n\n-   **cmd**: executable file/command. Default: `'node'`.\n-   **workers**: number of workers. Default: number of CPUs minus `1`.\n-   **concurrency**: number of scripts to execute concurrently. Default: `options.workers`.\n-   **ordered**: `boolean` indicating whether to preserve the order of script output. Default: `false`.\n-   **maxBuffer**: maximum child process `stdio` buffer size. This option is **only** applied when `options.ordered = true`. Default: `200*1024*1024` bytes.\n-   **uid**: child process user identity.\n-   **gid**: child process group identity.\n\nBy default, the number of workers running scripts is equal to the number of CPUs minus `1` (master process). To adjust the number of workers, set the `workers` option.\n\n\u003c!-- FIXME: revert back to JavaScript once can handle errors --\u003e\n\n\u003c!-- run-disable --\u003e\n\n```text\nvar files = [\n    './a.js',\n    './b.js'\n];\n\nfunction done( error ) {\n    if ( error ) {\n        console.error( 'Exit code: '+error.code );\n        console.error( 'Signal: '+error.signal );\n        throw error;\n    }\n    console.log( 'Done!' );\n}\n\nvar opts = {\n    'workers': 8\n};\n\nparallel( files, opts, done );\n```\n\nBy default, the number of scripts running concurrently is equal to the number of workers. To adjust the concurrency, set the `concurrency` option.\n\n\u003c!-- FIXME: revert back to JavaScript once can handle errors --\u003e\n\n\u003c!-- run-disable --\u003e\n\n```text\nvar files = [\n    './a.js',\n    './b.js'\n];\n\nfunction done( error ) {\n    if ( error ) {\n        console.error( 'Exit code: '+error.code );\n        console.error( 'Signal: '+error.signal );\n        throw error;\n    }\n    console.log( 'Done!' );\n}\n\nvar opts = {\n    'concurrency': 6\n};\n\nparallel( files, opts, done );\n```\n\nBy specifying a concurrency greater than the number of workers, a worker may be executing more than `1` script at any one time. While not likely to be advantageous for synchronous scripts, setting a higher concurrency may be advantageous for scripts performing asynchronous tasks.\n\nBy default, each script is executed as a [Node.js][node-js] script.\n\n```text\n$ node \u003cscript_path\u003e\n```\n\nTo run scripts via an alternative executable or none at all, set the `cmd` option.\n\n\u003c!-- FIXME: revert back to JavaScript once can handle errors --\u003e\n\n\u003c!-- run-disable --\u003e\n\n```text\nvar files = [\n    './a.js',\n    './b.js'\n];\n\nfunction done( error ) {\n    if ( error ) {\n        console.error( 'Exit code: '+error.code );\n        console.error( 'Signal: '+error.signal );\n        throw error;\n    }\n    console.log( 'Done!' );\n}\n\nvar opts = {\n    'cmd': '' // e.g., if scripts contain a shebang\n};\n\nparallel( files, opts, done );\n```\n\nBy default, the `stdio` output for each script is interleaved; i.e., the `stdio` output from one script **may** be interleaved with the `stdio` output from one or more other scripts. To preserve the `stdio` output order for each script, set the `ordered` option to `true`.\n\n\u003c!-- FIXME: revert back to JavaScript once can handle errors --\u003e\n\n\u003c!-- run-disable --\u003e\n\n```text\nvar files = [\n    './a.js',\n    './b.js'\n];\n\nfunction done( error ) {\n    if ( error ) {\n        console.error( 'Exit code: '+error.code );\n        console.error( 'Signal: '+error.signal );\n        throw error;\n    }\n    console.log( 'Done!' );\n}\n\nvar opts = {\n    'ordered': true\n};\n\nparallel( files, opts, done );\n```\n\n\u003c/section\u003e\n\n\u003c!-- /.usage --\u003e\n\n\u003csection class=\"notes\"\u003e\n\n## Notes\n\n-   Relative file paths are resolved relative to the current working directory.\n-   Ordered script output does **not** imply that scripts are executed in order. To preserve script order, execute the scripts sequentially via some other means.\n-   Script concurrency cannot exceed the number of scripts.\n-   If the script concurrency is less than the number of workers, the number of workers is reduced to match the specified concurrency.\n\n\u003c/section\u003e\n\n\u003c!-- /.notes --\u003e\n\n\u003csection class=\"examples\"\u003e\n\n## Examples\n\n\u003c!-- FIXME: re-enable running of code block once able to set `maxBuffer` configuration --\u003e\n\n\u003c!-- run-disable --\u003e\n\n\u003c!-- eslint-disable node/no-sync --\u003e\n\n\u003c!-- eslint no-undef: \"error\" --\u003e\n\n```javascript\nvar fs = require( 'fs' );\nvar path = require( 'path' );\nvar writeFileSync = require( '@stdlib/fs-write-file' ).sync;\nvar unlinkSync = require( '@stdlib/fs-unlink' ).sync;\nvar parallel = require( '@stdlib/utils-parallel' );\n\nfunction template( id ) {\n    var file = '';\n\n    file += '\\'use strict\\';';\n\n    file += 'var id;';\n    file += 'var N;';\n    file += 'var i;';\n\n    file += 'id = '+id+';';\n    file += 'N = 1e5;';\n    file += 'console.log( \\'File: %s. id: %s. N: %d.\\', __filename, id, N );';\n\n    file += 'for ( i = 0; i \u003c N; i++ ) {';\n    file += 'console.log( \\'id: %s. v: %d.\\', id, i );';\n    file += '}';\n\n    return file;\n}\n\nfunction createDir() {\n    var dir = path.join( __dirname, 'examples', 'tmp' );\n    fs.mkdirSync( dir );\n    return dir;\n}\n\nfunction createScripts( dir, nFiles ) {\n    var content;\n    var fpath;\n    var files;\n    var i;\n\n    files = [];\n    for ( i = 0; i \u003c nFiles; i++ ) {\n        content = template( i.toString() );\n        fpath = path.join( dir, i+'.js' );\n        writeFileSync( fpath, content, {\n            'encoding': 'utf8'\n        });\n        files.push( fpath );\n    }\n    return files;\n}\n\nvar nFiles = 10;\n\n// Make a temporary directory to store files:\nvar dir = createDir();\n\n// Create temporary files:\nvar files = createScripts( dir, nFiles );\n\n// Set the runner options:\nvar opts = {\n    'concurrency': 3,\n    'workers': 3,\n    'ordered': false\n};\n\n// Run all temporary scripts:\nparallel( files, opts, done );\n\nfunction done( error ) {\n    if ( error ) {\n        console.log( error.message );\n    }\n    cleanup();\n    console.log( 'Done!' );\n}\n\nfunction cleanup() {\n    var i;\n\n    // Delete the temporary files...\n    for ( i = 0; i \u003c files.length; i++ ) {\n        unlinkSync( files[ i ] );\n    }\n    // Remove temporary directory:\n    fs.rmdirSync( dir );\n}\n```\n\n\u003c/section\u003e\n\n\u003c!-- /.examples --\u003e\n\n* * *\n\n\u003csection class=\"cli\"\u003e\n\n## CLI\n\n\u003csection class=\"installation\"\u003e\n\n## Installation\n\nTo use as a general utility, install the CLI package globally\n\n```bash\nnpm install -g @stdlib/utils-parallel-cli\n```\n\n\u003c/section\u003e\n\n\u003c!-- CLI usage documentation. --\u003e\n\n\u003csection class=\"usage\"\u003e\n\n### Usage\n\n```text\nUsage: parallel [options] \u003cscript1\u003e \u003cscript2\u003e ...\n\nOptions:\n\n  -h,    --help                Print this message.\n  -V,    --version             Print the package version.\n         --cmd cmd             Executable file/command.\n         --workers num         Number of workers.\n         --concurrency num     Number of scripts to run concurrently.\n         --ordered             Preserve order of script output.\n         --uid uid             Process user identity.\n         --gid gid             Process group identity.\n         --maxbuffer size      Max buffer size for stdout and stderr.\n```\n\n\u003c/section\u003e\n\n\u003c!-- /.usage --\u003e\n\n\u003csection class=\"examples\"\u003e\n\n### Examples\n\n```bash\n$ parallel --cmd 'node' --workers 4 --concurrency 8 ./1.js ./2.js ./3.js ./4.js ./5.js ./6.js ./7.js ./8.js ./9.js ./10.js\n```\n\n\u003c/section\u003e\n\n\u003c!-- /.examples --\u003e\n\n\u003c/section\u003e\n\n\u003c!-- /.cli --\u003e\n\n\u003c!-- Section for related `stdlib` packages. Do not manually edit this section, as it is automatically populated. --\u003e\n\n\u003csection class=\"related\"\u003e\n\n\u003c/section\u003e\n\n\u003c!-- /.related --\u003e\n\n\u003c!-- Section for all links. Make sure to keep an empty line after the `section` element and another before the `/section` close. --\u003e\n\n\n\u003csection class=\"main-repo\" \u003e\n\n* * *\n\n## Notice\n\nThis package is part of [stdlib][stdlib], a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.\n\nFor more information on the project, filing bug reports and feature requests, and guidance on how to develop [stdlib][stdlib], see the main project [repository][stdlib].\n\n#### Community\n\n[![Chat][chat-image]][chat-url]\n\n---\n\n## License\n\nSee [LICENSE][stdlib-license].\n\n\n## Copyright\n\nCopyright \u0026copy; 2016-2026. The Stdlib [Authors][stdlib-authors].\n\n\u003c/section\u003e\n\n\u003c!-- /.stdlib --\u003e\n\n\u003c!-- Section for all links. Make sure to keep an empty line after the `section` element and another before the `/section` close. --\u003e\n\n\u003csection class=\"links\"\u003e\n\n[npm-image]: http://img.shields.io/npm/v/@stdlib/utils-parallel.svg\n[npm-url]: https://npmjs.org/package/@stdlib/utils-parallel\n\n[test-image]: https://github.com/stdlib-js/utils-parallel/actions/workflows/test.yml/badge.svg?branch=v0.3.4\n[test-url]: https://github.com/stdlib-js/utils-parallel/actions/workflows/test.yml?query=branch:v0.3.4\n\n[coverage-image]: https://img.shields.io/codecov/c/github/stdlib-js/utils-parallel/main.svg\n[coverage-url]: https://codecov.io/github/stdlib-js/utils-parallel?branch=main\n\n\u003c!--\n\n[dependencies-image]: https://img.shields.io/david/stdlib-js/utils-parallel.svg\n[dependencies-url]: https://david-dm.org/stdlib-js/utils-parallel/main\n\n--\u003e\n\n[chat-image]: https://img.shields.io/badge/zulip-join_chat-brightgreen.svg\n[chat-url]: https://stdlib.zulipchat.com\n\n[stdlib]: https://github.com/stdlib-js/stdlib\n\n[stdlib-authors]: https://github.com/stdlib-js/stdlib/graphs/contributors\n\n[cli-section]: https://github.com/stdlib-js/utils-parallel#cli\n[cli-url]: https://github.com/stdlib-js/utils-parallel/tree/cli\n[@stdlib/utils-parallel]: https://github.com/stdlib-js/utils-parallel/tree/main\n\n[umd]: https://github.com/umdjs/umd\n[es-module]: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Modules\n\n[deno-url]: https://github.com/stdlib-js/utils-parallel/tree/deno\n[deno-readme]: https://github.com/stdlib-js/utils-parallel/blob/deno/README.md\n[umd-url]: https://github.com/stdlib-js/utils-parallel/tree/umd\n[umd-readme]: https://github.com/stdlib-js/utils-parallel/blob/umd/README.md\n[esm-url]: https://github.com/stdlib-js/utils-parallel/tree/esm\n[esm-readme]: https://github.com/stdlib-js/utils-parallel/blob/esm/README.md\n[branches-url]: https://github.com/stdlib-js/utils-parallel/blob/main/branches.md\n\n[stdlib-license]: https://raw.githubusercontent.com/stdlib-js/utils-parallel/main/LICENSE\n\n[node-js]: http://nodejs.org/\n\n\u003c/section\u003e\n\n\u003c!-- /.links --\u003e\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fstdlib-js%2Futils-parallel","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fstdlib-js%2Futils-parallel","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fstdlib-js%2Futils-parallel/lists"}