Sample timings and costs using various Heroku CI dyno types

heroku-ci-sample-timings-and-cost.md

Sample timings (in seconds)

Sample timings using Heroku CI for a small-ish Rails 6 app on various Heroku dyno types:

Dyno Type	Run 1 Duration	Run 2 Duration	Run 3 Duration	Average Duration
standard-1x	312	213	303	276
standard-2x	227	121	222	190
performance-m	162	164	175	167
performance-l	100	104	107	104

Pay-by-the-second billing

The cost for each build is based on the dyno type and it's prorated to the second.

For example, a performance-l dyno is billed at $500/month. If a build runs for 100 seconds, it would incur a cost of about 2 cents:

$500/month * 100 seconds / (30 days/month * 24 hours/day * 60 minutes/hour * 60 seconds/minute) = $0.01929

Cost comparison

Using the average build times for each of the dyno types above, we can calculate the corresponding cost per build:

Dyno Type	Average Duration Per Build (seconds)	Average Cost Per Build (USD)
standard-1x	276	$0.0027
standard-2x	190	$0.0037
performance-m	167	$0.0161
performance-l	104	$0.0200

specs-by-dyno-type.md

Specs for Heroku CI dyno types

Dyno Type	Memory (GB)	Compute	CPU Share	Dedicated	Cost Per Month (USD)
standard-1x	0.5	1x-4x	1x	no	$25
standard-2x	1.0	4x-8x	2x	no	$50
performance-m	2.5	11x	100%	yes	$250
performance-l	14.0	46x	100%	yes	$500