We have a small Clojure app on Heroku that performs backend tasks for a Rails
app. Low traffic (like a request a minute). Heap is 400M. We've been having
long (10 sec) GC pauses using both the default and G1 GC (both untuned).
Browsing our logs today, I found:
[GC pause (young) 156M->36M(400M), 56.0281380 secs]
A minute for GC seems... excessive.
Our other Clojure apps also have GC problems.
1. Is this something peculiar to Heroku? Clojure in small-memory environments?
I have very little experience with non-Clojure java apps, but a coworker says:
"I've run JVMs with +20g heaps, and *never* seen 10s pauses, let alone a whole
f%#^$ing minute".
2. Is there lore about appropriate GC tweaks for Clojure backend server apps?
--------
Latest book: /Functional Programming for the Object-Oriented Programmer/
https://leanpub.com/fp-oo
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