Issue #14718 has been updated by andresakata (Andr Guimares Sakata).

File jemalloc.png added
File glibc_arena_2.png added
File glibc.png added
File glibc-arena-2.log added
File glibc.log added
File jemalloc-3-5.log added

I removed the NewRelic dependency and it's using the `get_process_mem` gem instead. It should work on different platforms as well.

Now there is a README file in the repository that may help you to reproduce the tests. Let me know you have any issue.

Did some of the tests proposed by @bluz71 in a Ubuntu 14.04.

**Using glibc**

Min.   : 143.3
1st Qu.:1606.7
Median :1801.5
Mean   :1677.5
3rd Qu.:1943.0
Max.   :2158.4

**Using glibc `MALLOC_ARENA_MAX=2`**

Min.   :143.0
1st Qu.:608.3
Median :608.8
Mean   :592.5
3rd Qu.:618.3
Max.   :671.2

**Using jemalloc 3.5**

Min.   :113.5
1st Qu.:356.7
Median :374.8
Mean   :376.0
3rd Qu.:407.4
Max.   :645.2

Didn't make tests with jemalloc 5.1 yet...

----------------------------------------
Feature #14718: Use jemalloc by default?
https://bugs.ruby-lang.org/issues/14718#change-73192

* Author: mperham (Mike Perham)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
----------------------------------------
I know Sam opened #9113 4 years ago to suggest this but I'm revisiting the topic to see if there's any movement here for Ruby 2.6 or 2.7.  I supply a major piece of Ruby infrastructure (Sidekiq) and I keep hearing over and over how Ruby is terrible with memory, a huge memory hog with their Rails apps.  My users switch to jemalloc and a miracle occurs: their memory usage drops massively.  Some data points:

https://twitter.com/brandonhilkert/status/987400365627801601
https://twitter.com/d_jones/status/989866391787335680
https://github.com/mperham/sidekiq/issues/3824#issuecomment-383072469

Redis moved to jemalloc many years ago and it solved all of their memory issues too.  Their conclusion: the glibc allocator "sucks really really hard". http://oldblog.antirez.com/post/everything-about-redis-24.html

This is a real pain point for the entire Rails community and would improve Ruby's reputation immensely if we can solve this problem.

---Files--------------------------------
glibc_arena_2.png (7.23 KB)
jemalloc.png (21.1 KB)
glibc-arena-2.log (60.3 KB)
glibc.log (62.3 KB)
jemalloc-3-5.log (58.5 KB)
glibc.png (9.03 KB)


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