autoscale-desired-count

estimate the number of processes required to keep up with the current demand

Installation

This module is installed via npm:

$ npm install autoscale-desired-count

API

getAutoscaleDesiredCount(demand) ⇒ number

Estimate the number of processes required to keep up with the current demand.

| Parameter | Type | Description | | :---------------------------------- | :----- | :----------------------------------------------------------------------------------------------------------------------------------- | | demand | number | the number of jobs that need to be run | | opts.concurrency | number | the number of concurrent jobs the worker processes. | | opts.deadline | number | the time practically all jobs should be completed within. | | opts.meanProcessTime | number | mean job processing time. | | opts.requiredCompletionPercentile | number | percentile of jobs that should happen within the deadline. | | opts.stddev | number | standard deviation (1σ) of job processing time: 68% completed within ± this (defaults to half the meanProcessTime). | | opts.target | number | the number of seconds within which the desired % of tasks will complete. This will be calculated using other opts if not provided. |

Examples

Get the number of workers required to process 500 jobs within 1 minute given each job takes about 10 seconds to run and each worker only runs a single job at a time

const getAutoscaleDesiredCount = require('autoscale-desired-count');

const opts = {
  concurrency: 1,
  deadline: 60,
  meanProcessTime: 10
};

const jobs = 500;
const count = getAutoscaleDesiredCount(jobs, opts);

License

The BSD License

Copyright (c) 2020, Andrew Harris

All rights reserved.

Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met:

• Redistributions of source code must retain the above copyright notice, this list of conditions and the following disclaimer.

• Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following disclaimer in the documentation and/or other materials provided with the distribution.

• Neither the name of the copyright holder nor the names of its contributors may be used to endorse or promote products derived from this software without specific prior written permission.

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