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A Heroku app to measure latency from client to the server

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ping

A Heroku app to measure latency from client to the server

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Usage

Deploy and open the top page of the app.

Via Heroku button

Deploy

Click the Deloy to Heroku button, then migrate the database, and scale the worker:

$ heroku run rake db:migrate
$ heroku ps:scale worker=1

Schedule a task, say hourly, on Heroku Scheduler to sweep database for delayed execution of geocoding locations and measuring distances

rake locations:geocode ping_results:measure_distance

Via CLI

Alternatively, create an app on Heroku (or somewhere else), push, and provision add-ons:

$ heroku create <app-name>
$ heroku addons:create heroku-postgresql
$ heroku addons:create heroku-redis
$ heroku addons:create scheduler
$ git push heroku master

Migrate the database, and scale - one or more web and worker are needed:

$ heroku run rake db:migrate
$ heroku ps:scale web=1 worker=1

Schedule a task, say hourly, on Heroku Scheduler to sweep database for delayed execution of geocoding locations and measuring distances

rake locations:geocode ping_results:measure_distance

Debugging

Set APP_STATUS config var to staging for database access through the app.

Measurement

This program measures time needed to receive response for a HEAD request to one of its static assets. See the Javascript code for details.

The time measured should be for a round trip of packets between the client and the server. A tcpudmp shows something like below for each ping.

08:11:30.340923 IP misoan.51404 > ec2-54-243-156-39.compute-1.amazonaws.com.http: Flags [P.], seq 2347:3100, ack 2835, win 296, length 753
08:11:30.477844 IP ec2-54-243-156-39.compute-1.amazonaws.com.http > misoan.51404: Flags [P.], seq 2835:3052, ack 3100, win 96, length 217
08:11:30.477929 IP misoan.51404 > ec2-54-243-156-39.compute-1.amazonaws.com.http: Flags [.], ack 3052, win 314, length 0

Samples

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