autoscale-desired-count

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

Prerequisites

$ pip install pre-commit

Installation

This module is installed via npm:

$ pre-commit install --install-hooks
$ 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.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.