Jemalloc no longer working

[itay-grudev]

I am not sure why, but my memory usage exploded a while ago and from what I can tell jemalloc is no longer working. No action was performed on our side.

Here are some excerpts from my configuration:

> heroku run bash
> ruby -r rbconfig -e "puts RbConfig::CONFIG['MAINLIBS']"
-lz -lpthread -lrt -lrt -lgmp -ldl -lcrypt -lm

> jemalloc.sh ruby -r rbconfig -e "puts RbConfig::CONFIG['MAINLIBS']"
-lz -lpthread -lrt -lrt -lgmp -ldl -lcrypt -lm

> heroku config:get JEMALLOC_ENABLED
true

[gaffneyc]

@itay-grudev There isn't a good way to see if jemalloc is enabled through RbConfig or inside a process. The best way at the moment (which needs to be added to the readme) is this: #5 (comment)

Give that a try and let me know if it's not actually enabled. Jemalloc's allocation algorithm does a better job of allocating objects in already claimed free memory rather than requesting more from the system so it's possible there is a change in your app which is causing it to request and retain a lot more memory

[itay-grudev]

You are correct. It seems to be enabled using this way of testing. I will investigate alternative routes. Thank you.

P.S. Could you please document this: MALLOC_CONF=stats_print:true ruby -e "exit"