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If you're on heroku (or similarly memory-constrained VPS), it's worth noting that 2.1+ can use significantly more memory. I've been collecting bookmarks on how
by jerhinesmith 12y ago
If you're on heroku (or similarly memory-constrained VPS), it's worth noting that 2.1+ can use significantly more memory.
I've been collecting bookmarks on how to properly tune the GC environment variables in these situations -- hopefully they'll help someone else:
Heroku discussion: https://discussion.heroku.com/t/tuning-rgengc-2-1-on-heroku/359/6 https://discussion.heroku.com/t/tuning-rgengc-2-1-on-heroku/...
Using Out-of-band GC on 2.1: http://tmm1.net/ruby21-oobgc/ http://tmm1.net/ruby21-oobgc/
- timr 12y agoMaybe this will help someone, as well...we've been trying to collect all of the different tuning and implementation information on the Ruby GC in one place: https://www.omniref.com/ruby/2.1.2/symbols/GC#annotation=88&line=1 https://www.omniref.com/ruby/2.1.2/symbols/GC#annotation=88&...
- jerhinesmith 12y agoThat's actually a huge help. What I've also been looking for (and haven't been able to find) is a good guide on How to Tune your GC settings. Aman Gupta has gotten the closest so far* (I think), but I'd really love a step-by-step of "OK, open your console, run `GC.start`, take note of this property because it means X and indicates that Y would be a good setting for Z, etc. etc" * http://tmm1.net/ruby21-rgengc/ http://tmm1.net/ruby21-rgengc/
- MrBra 12y agoIt would be interesting or useful to know more about it, but what I think is that ideally a right impementation of a GC should not require any tweeks from the outside... and I am pretty sure you are not going to get any signifcant performance boost by using different GC values than default.
- joevandyk 12y agoI wish there was a "webapp" environment flag you could set that would tell Ruby to apply reasonable GC/memory settings for a larger / constantly running app.