When to add Heroku web dynos

[Chris McCann]

All,

I currently run Airnoise.io on Heroku with one web and two worker dynos. 

When I look at the metrics for the web dyno I often wonder what values of Response Time, Throughput, and Dyno Load would indicate the need for an additional web dyno. 

Occasional spikes of Dyno Load to 1.0 make me wonder if the web dyno is getting saturated with requests, but I don't really see any way to tell if requests are being dropped. 

If anyone has some experience in using the Heroku metrics to help guide their scaling, or if tools like New Relic offer better, more actionable data, I'd love to hear how you use those tools to manage your Heroku infrastructure.

Cheers,

Chris

[Bill Vieux]

Heroku recommends keeping it between .5 and 1 for non-performance dynos, so you should be fine there. 

I highly recommend the New Relic addon for Heroku - should be free for your current set up.  Makes it very easy to see both web and background job request times, dyno memory usage, etc. I also love Airbrake for error tracking. 

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[Chris McCann]

Great, thanks, Bill. I do use Airbrake and have the New Relic add-on though I'll admit their interface has always seemed a bit overwhelming in terms of the quantity and variety of information it provides. Will take another look.

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[Bill Vieux]

Happy to do a screenshare with you! 

[Alex Boster]

We use HireFire to autoscale dynos. The web dyno scaling is triggered by NewRelic’s Apdex score. Seems to work fine?

AB

[Nick Holden]

Hi Chris,

A former coworker of mine is an expert on Heroku performance and scaling, and he's happy to hop on free consulting calls with anybody willing to give his Rails Autoscale a try. I'd recommend reaching out to @adamlogic on Twitter, or I'd be happy to make an introduction if you'd prefer.

- Nick