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If the module is a function, you\ncan call this directly. If the module exports multiple functions, you can call them as they were properties\nof this proxy.\n\n**Kind**: instance property of [WorkerNodes](#WorkerNodes) \n\n\n### workerNodes.ready() ⇒ Promise\nA method to check if the minimum required number of workers are ready to serve the calls.\n\n**Kind**: instance method of [WorkerNodes](#WorkerNodes) \n**Returns**: Promise - resolves with a [WorkerNodes](#WorkerNodes) instance \n\n\n### workerNodes.terminate() ⇒ Promise\nStarts the process of terminating this instance.\n\n**Kind**: instance method of [WorkerNodes](#WorkerNodes) \n**Returns**: Promise - - resolved when the instance is terminated. \n\n\n\n## WorkerNodesOptions\nDescribes a WorkerNodes options.\n\n**Kind**: global class \n\n* [WorkerNodesOptions](#WorkerNodesOptions)\n * [.autoStart](#WorkerNodesOptions+autoStart) : Boolean\n * [.lazyStart](#WorkerNodesOptions+lazyStart) : Boolean\n * [.minWorkers](#WorkerNodesOptions+minWorkers) : Number\n * [.maxWorkers](#WorkerNodesOptions+maxWorkers) : Number\n * [.maxTasks](#WorkerNodesOptions+maxTasks) : Number\n * [.maxTasksPerWorker](#WorkerNodesOptions+maxTasksPerWorker) : Number\n * [.taskTimeout](#WorkerNodesOptions+taskTimeout) : Number\n * [.taskMaxRetries](#WorkerNodesOptions+taskMaxRetries) : Number\n * [.workerEndurance](#WorkerNodesOptions+workerEndurance) : Number\n * [.workerStopTimeout](#WorkerNodesOptions+workerStopTimeout) : Number\n\n\n\n\n### options.autoStart : Boolean\nWhether should initialize the workers before a first call.\n\nIf true, depending on the [lazyStart](#WorkerNodesOptions+lazyStart) option, it will start the\n[min](#WorkerNodesOptions+minWorkers) or [max](#WorkerNodesOptions+maxWorkers) number of workers.\n\n**Kind**: instance property of [WorkerNodesOptions](#WorkerNodesOptions) \n**Default**: false \n\n\n### options.lazyStart : Boolean\nWhether should start a new worker only if all the others are busy.\n\n**Kind**: instance property of [WorkerNodesOptions](#WorkerNodesOptions) \n**Default**: false \n\n\n### options.minWorkers : Number\nThe minimum number of workers that needs to be running to consider the whole pool as operational.\n\n**Kind**: instance property of [WorkerNodesOptions](#WorkerNodesOptions) \n**Default**: 0 \n\n\n### options.maxWorkers : Number\nThe maximum number of workers that can be running at the same time.\nDefaults to the number of cores the operating system sees.\n\n**Kind**: instance property of [WorkerNodesOptions](#WorkerNodesOptions) \n\n\n### options.maxTasks : Number\nThe maximum number of calls that can be handled at the same time.\nExceeding this limit causes MaxConcurrentCallsError to be thrown.\n\n**Kind**: instance property of [WorkerNodesOptions](#WorkerNodesOptions) \n**Default**: Infinity \n\n\n### options.maxTasksPerWorker : Number\nThe number of calls that can be given to a single worker at the same time.\n\n**Kind**: instance property of [WorkerNodesOptions](#WorkerNodesOptions) \n**Default**: 1 \n\n\n### options.taskTimeout : Number\nThe number milliseconds after which a call is considered to be lost.\nExceeding this limit causes TimeoutError to be thrown and a worker that performed that task to be killed.\n\n**Kind**: instance property of [WorkerNodesOptions](#WorkerNodesOptions) \n**Default**: Infinity \n\n\n### options.taskMaxRetries : Number\nThe maximum number of retries that will be performed over a task before reporting it as incorrectly terminated.\nExceeding this limit causes ProcessTerminatedError to be thrown.\n\n**Kind**: instance property of [WorkerNodesOptions](#WorkerNodesOptions) \n**Default**: 0 \n\n\n### options.workerEndurance : Number\nThe maximum number of calls that a single worker can handle during its whole lifespan.\nExceeding this limit causes the termination of the worker.\n\n**Kind**: instance property of [WorkerNodesOptions](#WorkerNodesOptions) \n**Default**: Infinity \n\n\n### options.workerStopTimeout : Number\nThe timeout value (in milliseconds) for the worker to stop before sending SIGKILL.\n\n**Kind**: instance property of [WorkerNodesOptions](#WorkerNodesOptions) \n**Default**: 100 \n\n\n\n## Example\n\nGiven `/home/joe.doe/workspace/my-module.js`:\n```javascript\nmodule.exports = function myTask() {\n return 'hello from separate process!';\n};\n```\n\nyou can run it through the worker nodes as follows:\n```javascript\nconst WorkerNodes = require('worker-nodes');\nconst myModuleWorkerNodes = new WorkerNodes('/home/joe.doe/workspace/my-module');\n\nmyModuleWorkerNodes.call().then(msg => console.log(msg)); // -> 'hello from separate process!'\n```\n\nFor more advanced examples please refer to [the test cases](https://github.com/allegro/node-worker-nodes/blob/master/tests/e2e.spec.js).\n\n\n## Running tests\n\nCheck out the library code and then:\n\n```bash\n$ npm install\n$ npm test\n```\n\n## Benchmarks\n\nTo run tests, type:\n\n```bash\n$ npm install\n$ npm run benchmark\n```\n\nIt will run a performance test against the selected libraries:\n- data in: an object that consists of a single field that is a 0.5MB random string\n- data out: received object stringified and concatenated with another 1MB string\n\nExample results:\n```bash\nresults for 100 executions\n\nname time: total [ms] time usr [ms] time sys [ms] worker usr [ms] worker sys [ms] mem rss [MB] worker rss [MB] errors\n------------------ ---------------- ------------- ------------- --------------- --------------- ------------ --------------- ------\nno-workers 162 250 38 0 0 101 0 0\nworker-nodes@next 458 573 186 571 185 210 207 0\nworker-nodes@1.6.1 1503 670 395 991 337 292 87 0\nworkerpool@2.3.0 1684 1511 688 292 82 155 49 0\nworker-farm@1.6.0 2508 1435 511 1247 368 104 59 0\nprocess-pool@0.3.4 2571 1537 517 1333 376 105 61 0\nworker-pool@3.0.2 15939 15984 5632 1946 546 86 79 0\n\n os : Darwin / 17.5.0 / x64\n cpu : Intel(R) Core(TM) i7-7700HQ CPU @ 2.80GHz × 8\n```\n\n## See also\n\nsources of inspiration:\n* [Worker Farm](https://github.com/rvagg/node-worker-farm)\n* [workerpool](https://github.com/josdejong/workerpool)\n* [process-pool](https://github.com/ohjames/process-pool)\n* [node-worker-pool](https://github.com/jeffmo/node-worker-pool)\n\n## License\n\nCopyright 2016 Grupa Allegro Sp. z o.o.\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","readmeFilename":"Readme.md","gitHead":"37b3f7ea7b93d7085affbbdec82aa8979b138640","_id":"worker-nodes@2.0.0-alpha.1","_npmVersion":"6.2.0","_nodeVersion":"10.6.0","_npmUser":{"name":"kwiatkk1","email":"kwiatkk1+npm@gmail.com"},"dist":{"integrity":"sha512-oliPybB5mMTqzVjpDtyJsJ+3OaEDlZmlp8nbTmJQZuuUZHNE/erkU9XmeVB30etDDglxAiYdxIYuybQPjMsmaA==","shasum":"aa4a2c02cb48cfaf42e7287ceca4318d656f70b8","tarball":"https://registry.npmjs.org/worker-nodes/-/worker-nodes-2.0.0-alpha.1.tgz","fileCount":18,"unpackedSize":48879,"npm-signature":"-----BEGIN PGP SIGNATURE-----\r\nVersion: OpenPGP.js v3.0.4\r\nComment: https://openpgpjs.org\r\n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\norQE\r\n=XrxV\r\n-----END PGP SIGNATURE-----\r\n","signatures":[{"keyid":"SHA256:jl3bwswu80PjjokCgh0o2w5c2U4LhQAE57gj9cz1kzA","sig":"MEUCIQCUb2yvh2Xaj0sos5sqdEUb5ftEFvwPm2W4oRKKtW96zgIgDBfyH+2nypLRlZReT6vGocpKyHLIgxF0kCvPtkNsBjM="}]},"maintainers":[{"name":"allegrotech","email":"opensource@allegro.pl"},{"name":"kwiatkk1","email":"kwiatkk1+npm@gmail.com"}],"directories":{},"_npmOperationalInternal":{"host":"s3://npm-registry-packages","tmp":"tmp/worker-nodes_2.0.0-alpha.1_1531744765358_0.8833956532531282"},"_hasShrinkwrap":false},"2.0.0-rc.1":{"name":"worker-nodes","version":"2.0.0-rc.1","description":"A library to run cpu-intensive tasks without blocking the event loop.","keywords":["workers","pool","farm","cluster"],"repository":{"type":"git","url":"git://github.com/allegro/node-worker-nodes.git"},"bugs":{"url":"https://github.com/allegro/node-worker-nodes/issues"},"homepage":"https://github.com/allegro/node-worker-nodes","main":"./lib/index.js","engines":{"node":">=11.7.0"},"scripts":{"docs":"jsdoc2md -l off -t docs-src/Readme.hbs lib/*.js > Readme.md; 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If the module is a function, you\ncan call this directly. If the module exports multiple functions, you can call them as they were properties\nof this proxy.\n\n**Kind**: instance property of [WorkerNodes](#WorkerNodes) \n\n\n### workerNodes.ready() ⇒ Promise\nA method to check if the minimum required number of workers are ready to serve the calls.\n\n**Kind**: instance method of [WorkerNodes](#WorkerNodes) \n**Returns**: Promise - resolves with a [WorkerNodes](#WorkerNodes) instance \n\n\n### workerNodes.terminate() ⇒ Promise\nStarts the process of terminating this instance.\n\n**Kind**: instance method of [WorkerNodes](#WorkerNodes) \n**Returns**: Promise - - resolved when the instance is terminated. \n\n\n\n## WorkerNodesOptions\nDescribes a WorkerNodes options.\n\n**Kind**: global class \n\n* [WorkerNodesOptions](#WorkerNodesOptions)\n * [.autoStart](#WorkerNodesOptions+autoStart) : Boolean\n * [.lazyStart](#WorkerNodesOptions+lazyStart) : Boolean\n * [.minWorkers](#WorkerNodesOptions+minWorkers) : Number\n * [.maxWorkers](#WorkerNodesOptions+maxWorkers) : Number\n * [.maxTasks](#WorkerNodesOptions+maxTasks) : Number\n * [.maxTasksPerWorker](#WorkerNodesOptions+maxTasksPerWorker) : Number\n * [.taskTimeout](#WorkerNodesOptions+taskTimeout) : Number\n * [.taskMaxRetries](#WorkerNodesOptions+taskMaxRetries) : Number\n * [.workerEndurance](#WorkerNodesOptions+workerEndurance) : Number\n * [.workerStopTimeout](#WorkerNodesOptions+workerStopTimeout) : Number\n\n\n\n### options.autoStart : Boolean\nWhether should initialize the workers before a first call.\n\nIf true, depending on the [lazyStart](#WorkerNodesOptions+lazyStart) option, it will start the\n[min](#WorkerNodesOptions+minWorkers) or [max](#WorkerNodesOptions+maxWorkers) number of workers.\n\n**Kind**: instance property of [WorkerNodesOptions](#WorkerNodesOptions) \n**Default**: false \n\n\n### options.lazyStart : Boolean\nWhether should start a new worker only if all the others are busy.\n\n**Kind**: instance property of [WorkerNodesOptions](#WorkerNodesOptions) \n**Default**: false \n\n\n### options.minWorkers : Number\nThe minimum number of workers that needs to be running to consider the whole pool as operational.\n\n**Kind**: instance property of [WorkerNodesOptions](#WorkerNodesOptions) \n**Default**: 0 \n\n\n### options.maxWorkers : Number\nThe maximum number of workers that can be running at the same time.\nDefaults to the number of cores the operating system sees.\n\n**Kind**: instance property of [WorkerNodesOptions](#WorkerNodesOptions) \n\n\n### options.maxTasks : Number\nThe maximum number of calls that can be handled at the same time.\nExceeding this limit causes MaxConcurrentCallsError to be thrown.\n\n**Kind**: instance property of [WorkerNodesOptions](#WorkerNodesOptions) \n**Default**: Infinity \n\n\n### options.maxTasksPerWorker : Number\nThe number of calls that can be given to a single worker at the same time.\n\n**Kind**: instance property of [WorkerNodesOptions](#WorkerNodesOptions) \n**Default**: 1 \n\n\n### options.taskTimeout : Number\nThe number milliseconds after which a call is considered to be lost.\nExceeding this limit causes TimeoutError to be thrown and a worker that performed that task to be killed.\n\n**Kind**: instance property of [WorkerNodesOptions](#WorkerNodesOptions) \n**Default**: Infinity \n\n\n### options.taskMaxRetries : Number\nThe maximum number of retries that will be performed over a task before reporting it as incorrectly terminated.\nExceeding this limit causes ProcessTerminatedError to be thrown.\n\n**Kind**: instance property of [WorkerNodesOptions](#WorkerNodesOptions) \n**Default**: 0 \n\n\n### options.workerEndurance : Number\nThe maximum number of calls that a single worker can handle during its whole lifespan.\nExceeding this limit causes the termination of the worker.\n\n**Kind**: instance property of [WorkerNodesOptions](#WorkerNodesOptions) \n**Default**: Infinity \n\n\n### options.workerStopTimeout : Number\nThe timeout value (in milliseconds) for the worker to stop before sending SIGKILL.\n\n**Kind**: instance property of [WorkerNodesOptions](#WorkerNodesOptions) \n**Default**: 100 \n\n## Example\n\nGiven `/home/joe.doe/workspace/my-module.js`:\n```javascript\nmodule.exports = function myTask() {\n return 'hello from separate process!';\n};\n```\n\nyou can run it through the worker nodes as follows:\n```javascript\nconst WorkerNodes = require('worker-nodes');\nconst myModuleWorkerNodes = new WorkerNodes('/home/joe.doe/workspace/my-module');\n\nmyModuleWorkerNodes.call().then(msg => console.log(msg)); // -> 'hello from separate process!'\n```\n\nFor more advanced examples please refer to [the test cases](https://github.com/allegro/node-worker-nodes/blob/master/tests/e2e.spec.js).\n\n\n## Running tests\n\nCheck out the library code and then:\n\n```bash\n$ npm install\n$ npm test\n```\n\n## Benchmarks\n\nTo run tests, type:\n\n```bash\n$ npm install\n$ npm run benchmark\n```\n\nIt will run a performance test against the selected libraries:\n- data in: an object that consists of a single field that is a 0.5MB random string\n- data out: received object stringified and concatenated with another 1MB string\n\nExample results:\n```bash\nresults for 100 executions\n\nname time: total [ms] time usr [ms] time sys [ms] worker usr [ms] worker sys [ms] mem rss [MB] worker rss [MB] errors\n------------------ ---------------- ------------- ------------- --------------- --------------- ------------ --------------- ------\nno-workers 162 250 38 0 0 101 0 0\nworker-nodes@next 458 573 186 571 185 210 207 0\nworker-nodes@1.6.1 1503 670 395 991 337 292 87 0\nworkerpool@2.3.0 1684 1511 688 292 82 155 49 0\nworker-farm@1.6.0 2508 1435 511 1247 368 104 59 0\nprocess-pool@0.3.4 2571 1537 517 1333 376 105 61 0\nworker-pool@3.0.2 15939 15984 5632 1946 546 86 79 0\n\nos : Darwin / 17.5.0 / x64\ncpu : Intel(R) Core(TM) i7-7700HQ CPU @ 2.80GHz × 8\n```\n\n## See also\n\nsources of inspiration:\n* [Worker Farm](https://github.com/rvagg/node-worker-farm)\n* [workerpool](https://github.com/josdejong/workerpool)\n* [process-pool](https://github.com/ohjames/process-pool)\n* [node-worker-pool](https://github.com/jeffmo/node-worker-pool)\n\n## License\n\nCopyright 2016 Grupa Allegro Sp. z o.o.\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.","readmeFilename":"Readme.md","gitHead":"66cfc782e3322410280253e2cf284fafc65ba8e6","_id":"worker-nodes@2.0.0-rc.1","_nodeVersion":"11.10.0","_npmVersion":"6.8.0","dist":{"integrity":"sha512-sbwL5dtqCGlNXRtU45nV1KLi7FX1r0Sq7AoJu6v78zJUVGwFD5uT+eelaPL5b5p8s+fsFI+vxEISx2AZWqEXog==","shasum":"95ac882122912a26033fd43a1beb2d531e5fbf6b","tarball":"https://registry.npmjs.org/worker-nodes/-/worker-nodes-2.0.0-rc.1.tgz","fileCount":18,"unpackedSize":48884,"npm-signature":"-----BEGIN PGP SIGNATURE-----\r\nVersion: OpenPGP.js v3.0.4\r\nComment: https://openpgpjs.org\r\n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\n55jH\r\n=ESKH\r\n-----END PGP SIGNATURE-----\r\n","signatures":[{"keyid":"SHA256:jl3bwswu80PjjokCgh0o2w5c2U4LhQAE57gj9cz1kzA","sig":"MEYCIQCDXuoHl1Gr6Jla7kXnt7Gt1L4L6Fy2GUW8SPe9af8lpAIhAJpE+qDV9FEx8eQO+ewBdeAYnOdi6qH4EFRFlUCccJue"}]},"maintainers":[{"name":"allegrotech","email":"opensource@allegro.pl"},{"name":"kwiatkk1","email":"kwiatkk1+npm@gmail.com"}],"_npmUser":{"name":"kwiatkk1","email":"kwiatkk1+npm@gmail.com"},"directories":{},"_npmOperationalInternal":{"host":"s3://npm-registry-packages","tmp":"tmp/worker-nodes_2.0.0-rc.1_1550747324246_0.710148792301653"},"_hasShrinkwrap":false},"2.0.0-rc.2":{"name":"worker-nodes","version":"2.0.0-rc.2","description":"A library to run cpu-intensive tasks without blocking the event loop.","keywords":["workers","pool","farm","cluster"],"repository":{"type":"git","url":"git://github.com/allegro/node-worker-nodes.git"},"bugs":{"url":"https://github.com/allegro/node-worker-nodes/issues"},"homepage":"https://github.com/allegro/node-worker-nodes","main":"./lib/index.js","engines":{"node":">=12"},"scripts":{"docs":"jsdoc2md -l off -t docs-src/Readme.hbs lib/*.js > Readme.md; 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If the module is a function, you\ncan call this directly. If the module exports multiple functions, you can call them as they were properties\nof this proxy.\n\n**Kind**: instance property of [WorkerNodes](#WorkerNodes) \n\n\n### workerNodes.ready() ⇒ Promise\nA method to check if the minimum required number of workers are ready to serve the calls.\n\n**Kind**: instance method of [WorkerNodes](#WorkerNodes) \n**Returns**: Promise - resolves with a [WorkerNodes](#WorkerNodes) instance \n\n\n### workerNodes.terminate() ⇒ Promise\nStarts the process of terminating this instance.\n\n**Kind**: instance method of [WorkerNodes](#WorkerNodes) \n**Returns**: Promise - - resolved when the instance is terminated. \n\n\n### workerNodes.profiler(duration) ⇒ void\nRun CPU Profiler and save result on main process directory\n\n**Kind**: instance method of [WorkerNodes](#WorkerNodes) \n\n| Param | Type |\n| --- | --- |\n| duration | number | \n\n\n\n### workerNodes.takeSnapshot() ⇒ void\nTake Heap Snapshot and save result on main process directory\n\n**Kind**: instance method of [WorkerNodes](#WorkerNodes) \n\n\n### workerNodes.getUsedWorkers() ⇒ Array.<Worker>\nReturn list with used workers in pool\n\n**Kind**: instance method of [WorkerNodes](#WorkerNodes) \n\n\n\n## WorkerNodesOptions\nDescribes a WorkerNodes options.\n\n**Kind**: global class \n\n* [WorkerNodesOptions](#WorkerNodesOptions)\n * [.autoStart](#WorkerNodesOptions+autoStart) : Boolean\n * [.lazyStart](#WorkerNodesOptions+lazyStart) : Boolean\n * [.asyncWorkerInitialization](#WorkerNodesOptions+asyncWorkerInitialization) : Boolean\n * [.minWorkers](#WorkerNodesOptions+minWorkers) : Number\n * [.maxWorkers](#WorkerNodesOptions+maxWorkers) : Number\n * [.maxTasks](#WorkerNodesOptions+maxTasks) : Number\n * [.maxTasksPerWorker](#WorkerNodesOptions+maxTasksPerWorker) : Number\n * [.taskTimeout](#WorkerNodesOptions+taskTimeout) : Number\n * [.taskMaxRetries](#WorkerNodesOptions+taskMaxRetries) : Number\n * [.workerEndurance](#WorkerNodesOptions+workerEndurance) : Number\n * [.workerStopTimeout](#WorkerNodesOptions+workerStopTimeout) : Number\n * [.resourceLimits](#WorkerNodesOptions+resourceLimits) : Object\n * [.workerType](#WorkerNodesOptions+workerType) : string\n\n\n\n### options.autoStart : Boolean\nWhether should initialize the workers before a first call.\n\nIf true, depending on the [lazyStart](#WorkerNodesOptions+lazyStart) option, it will start the\n[min](#WorkerNodesOptions+minWorkers) or [max](#WorkerNodesOptions+maxWorkers) number of workers.\n\n**Kind**: instance property of [WorkerNodesOptions](#WorkerNodesOptions) \n**Default**: false \n\n\n### options.lazyStart : Boolean\nWhether should start a new worker only if all the others are busy.\n\n**Kind**: instance property of [WorkerNodesOptions](#WorkerNodesOptions) \n**Default**: false \n\n\n### options.asyncWorkerInitialization : Boolean\nEnables async initialization of worker.\nTo start handling task over worker, need to invoke `sendWorkerMessage('ready')` function when it fully initialized.\nFor examples please refer to [the test cases](https://github.com/allegro/node-worker-nodes/blob/master/e2e/async-initialization.spec.js)\n\n**Kind**: instance property of [WorkerNodesOptions](#WorkerNodesOptions) \n**Default**: false \n\n\n### options.minWorkers : Number\nThe minimum number of workers that needs to be running to consider the whole pool as operational.\n\n**Kind**: instance property of [WorkerNodesOptions](#WorkerNodesOptions) \n**Default**: 0 \n\n\n### options.maxWorkers : Number\nThe maximum number of workers that can be running at the same time.\nDefaults to the number of cores the operating system sees.\n\n**Kind**: instance property of [WorkerNodesOptions](#WorkerNodesOptions) \n\n\n### options.maxTasks : Number\nThe maximum number of calls that can be handled at the same time.\nExceeding this limit causes MaxConcurrentCallsError to be thrown.\n\n**Kind**: instance property of [WorkerNodesOptions](#WorkerNodesOptions) \n**Default**: Infinity \n\n\n### options.maxTasksPerWorker : Number\nThe number of calls that can be given to a single worker at the same time.\n\n**Kind**: instance property of [WorkerNodesOptions](#WorkerNodesOptions) \n**Default**: 1 \n\n\n### options.taskTimeout : Number\nThe number milliseconds after which a call is considered to be lost.\nExceeding this limit causes TimeoutError to be thrown and a worker that performed that task to be killed.\n\n**Kind**: instance property of [WorkerNodesOptions](#WorkerNodesOptions) \n**Default**: Infinity \n\n\n### options.taskMaxRetries : Number\nThe maximum number of retries that will be performed over a task before reporting it as incorrectly terminated.\nExceeding this limit causes ProcessTerminatedError to be thrown.\n\n**Kind**: instance property of [WorkerNodesOptions](#WorkerNodesOptions) \n**Default**: 0 \n\n\n### options.workerEndurance : Number\nThe maximum number of calls that a single worker can handle during its whole lifespan.\nExceeding this limit causes the termination of the worker.\n\n**Kind**: instance property of [WorkerNodesOptions](#WorkerNodesOptions) \n**Default**: Infinity \n\n\n### options.workerStopTimeout : Number\nThe timeout value (in milliseconds) for the worker to stop before sending SIGKILL.\n\n**Kind**: instance property of [WorkerNodesOptions](#WorkerNodesOptions) \n**Default**: 100 \n\n\n### options.resourceLimits : Object\nProvides the set of JS engine resource constraints inside this Worker thread. (Usable when using `workerType: thread` only)\n\n**Kind**: instance property of [WorkerNodesOptions](#WorkerNodesOptions) \n**Properties**\n\n| Name | Type | Description |\n| --- | --- | --- |\n| maxYoungGenerationSizeMb | Number | The maximum size of a heap space for recently created objects |\n| maxOldGenerationSizeMb | Number | The maximum size of the main heap in MB |\n| codeRangeSizeMb | Number | The size of a pre-allocated memory range used for generated code |\n| stackSizeMb | Number | The default maximum stack size for the thread. Small values may lead to unusable Worker instances |\n\n### options.workerType : string\nCan be either `process` or `thread` (default), that controls the underlying implementation used, either `child_process` or `worker_threads`.\nMost usecases are perfectly fine with `thread` implementation, some work loads though, might need to use `process`, for example, if you are using\n`process.chdir()` call which is [not supported](https://github.com/nodejs/node/issues/41673) in `worker_threads`.\n\n## Example\n\nGiven `/home/joe.doe/workspace/my-module.js`:\n```javascript\nmodule.exports = function myTask() {\n return 'hello from separate process!';\n};\n```\n\nyou can run it through the worker nodes as follows:\n```javascript\nconst WorkerNodes = require('worker-nodes');\nconst myModuleWorkerNodes = new WorkerNodes('/home/joe.doe/workspace/my-module');\n\nmyModuleWorkerNodes.call().then(msg => console.log(msg)); // -> 'hello from separate process!'\n```\n\nFor more advanced examples please refer to [the test cases](https://github.com/allegro/node-worker-nodes/tree/main/e2e).\n\n\n## Running tests\n\nCheck out the library code and then:\n\n```bash\n$ npm install\n$ npm test\n```\n\n## Benchmarks\n\nTo run tests, type:\n\n```bash\n$ npm install\n$ npm run benchmark\n```\n\nIt will run a performance test against the selected libraries:\n- data in: an object that consists of a single field that is a 0.5MB random string\n- data out: received object stringified and concatenated with another 1MB string\n\nExample results:\n```bash\nresults for 100 executions\n\nname time: total [ms] time usr [ms] time sys [ms] worker usr [ms] worker sys [ms] mem rss [MB] worker rss [MB] errors\n------------------ ---------------- ------------- ------------- --------------- --------------- ------------ --------------- ------\nno-workers 148 203 37 0 0 98 0 0\nworker-nodes@2.0.0 362 390 143 389 143 213 210 0\nworkerpool@6.0.0 367 495 185 492 182 236 245 0\nworker-nodes@1.6.1 1095 520 207 592 243 216 86 0\nworker-farm@1.7.0 1886 749 276 947 299 221 70 0\nprocess-pool@0.3.5 2002 847 285 986 309 219 74 0\nworker-pool@3.0.2 13775 7129 5236 1891 952 363 63 0\n\n os : Darwin / 19.5.0 / x64\n cpu : Intel(R) Core(TM) i7-7660U CPU @ 2.50GHz × 4\nnode : 14.3.0 / v8: 8.1.307.31-node.33\n```\n\n## See also\n\nsources of inspiration:\n* [Worker Farm](https://github.com/rvagg/node-worker-farm)\n* [workerpool](https://github.com/josdejong/workerpool)\n* [process-pool](https://github.com/ohjames/process-pool)\n* [node-worker-pool](https://github.com/jeffmo/node-worker-pool)\n\n## License\n\nCopyright Allegro Sp. z o.o.\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.","maintainers":[{"name":"allegrotech","email":"opensource@allegro.pl"},{"name":"bgalek","email":"bartosz@galek.com.pl"}],"time":{"modified":"2024-04-17T22:24:00.705Z","created":"2016-11-01T15:21:56.754Z","1.0.0":"2016-11-01T15:21:56.754Z","1.1.0":"2016-11-02T08:33:07.590Z","1.2.0":"2016-11-08T00:20:11.675Z","1.2.1":"2016-12-19T21:36:05.813Z","1.3.0":"2017-01-23T09:04:26.577Z","1.3.1":"2017-02-05T17:48:12.987Z","1.4.0":"2017-05-29T20:56:13.362Z","1.5.0":"2017-06-22T11:29:03.201Z","1.6.0":"2017-09-12T20:34:49.402Z","1.6.1":"2018-06-20T08:03:29.390Z","2.0.0-alpha.1":"2018-07-16T12:39:25.463Z","2.0.0-rc.1":"2019-02-21T11:08:44.428Z","2.0.0-rc.2":"2020-07-02T08:03:12.579Z","2.0.0":"2020-07-06T07:28:41.994Z","2.1.0":"2020-07-06T21:12:15.396Z","2.2.0":"2020-09-17T13:15:12.761Z","2.2.1":"2020-09-17T13:19:11.098Z","2.3.0":"2020-11-26T11:15:16.326Z","2.3.1":"2021-05-05T10:23:03.828Z","2.4.0-beta.0":"2021-12-21T12:32:35.174Z","2.4.0":"2021-12-21T15:24:42.829Z","2.5.0":"2023-06-13T22:18:19.877Z","2.6.0":"2023-06-22T09:10:13.836Z","2.7.0":"2024-04-17T22:24:00.527Z"},"homepage":"https://github.com/allegro/node-worker-nodes","keywords":["workers","pool","farm","cluster"],"repository":{"type":"git","url":"git://github.com/allegro/node-worker-nodes.git"},"contributors":[{"name":"Krzysztof Kwiatkowski","email":"kwiatkk1+npm@gmail.com"},{"name":"Rafał Augustyniak","email":"rafal.augustus@gmail.com"},{"name":"Bartosz Gałek","email":"bartosz@galek.com.pl"}],"bugs":{"url":"https://github.com/allegro/node-worker-nodes/issues"},"license":"Apache-2.0","readmeFilename":"Readme.md","users":{"quocnguyen":true,"stevenvachon":true,"tracker1":true}}