CODEWITHSUNDEEP
rubyperformancegarbage-collectionruby-2.0
Fernando Diaz Garrido
Fernando Diaz Garrido

Reputation: 3995

Garbage collector tuning in Ruby 2.0

I was wondering if the GC tuning used for ruby 1.9.x is still relevant in 2.0 with the new implementation of the GC. If so, are there any new things that we can configure on the new version?

I am talking about the following setups

RUBY_HEAP_MIN_SLOTS=600000 
RUBY_GC_MALLOC_LIMIT=59000000
RUBY_HEAP_FREE_MIN=100000

Upvotes: 32

Views: 9463

Answers (2)

user2126990
user2126990

Reputation:

From Ruby 2.1.x http://tmm1.net/ruby21-rgengc/

export RUBY_GC_HEAP_INIT_SLOTS=600000
export RUBY_GC_HEAP_FREE_SLOTS=600000
export RUBY_GC_HEAP_GROWTH_FACTOR=1.25
export RUBY_GC_HEAP_GROWTH_MAX_SLOTS=300000

or this

# Boost Ruby
export RUBY_GC_HEAP_INIT_SLOTS=1000000 # 1M
export RUBY_GC_HEAP_FREE_SLOTS=500000  # 0.5M
export RUBY_GC_HEAP_GROWTH_FACTOR=1.1
export RUBY_GC_HEAP_GROWTH_MAX_SLOTS=10000000 # 10M
export RUBY_GC_MALLOC_LIMIT_MAX=1000000000    # 1G
export RUBY_GC_MALLOC_LIMIT_GROWTH_FACTOR=1.1
# export RUBY_GC_OLDMALLOC_LIMIT=500000000      # 500M
# export RUBY_GC_OLDMALLOC_LIMIT_MAX=1000000000 # 1G
# export RUBY_GC_OLDMALLOC_LIMIT_GROWTH_FACTOR=1.1

Performance MRI Ruby Patch

$ rvm install 2.1.2 --patch railsexpress -n railsexpress
$ rvm --default use 2.1.2-railsexpress

Upvotes: 14

davogones
davogones

Reputation: 7399

There's a fair bit of confusion about these GC tuning parameters. REE (which is a fork of Ruby 1.8.7) introduced its own parameters first, and later Ruby (starting in 1.9.2) introduced its own (similar) parameters. Ruby 1.9.3 made them customizable via environment variables, and Ruby 2.1.0 added a lot more.

This blog post goes into great detail about garbage collection in MRI and what all the tuning variables mean.

Here's a complete list of all the tuning variables for each Ruby version:

REE source

  • RUBY_HEAP_MIN_SLOTS
  • RUBY_HEAP_SLOTS_INCREMENT
  • RUBY_HEAP_SLOTS_GROWTH_FACTOR
  • RUBY_GC_MALLOC_LIMIT
  • RUBY_HEAP_FREE_MIN

Ruby 1.9.2 source source

(Hard-coded, but customizable via environment variables with this patch)

  • GC_MALLOC_LIMIT
  • HEAP_MIN_SLOTS
  • FREE_MIN

Ruby 1.9.3 source

  • RUBY_GC_MALLOC_LIMIT
  • RUBY_HEAP_MIN_SLOTS
  • RUBY_FREE_MIN

Ruby 2.0.0 source

Same as Ruby 1.9.3

Ruby 2.1.0 source

  • RUBY_GC_HEAP_INIT_SLOTS (obsoletes RUBY_HEAP_MIN_SLOTS)
  • RUBY_GC_HEAP_FREE_SLOTS (obsoletes RUBY_FREE_MIN)
  • RUBY_GC_HEAP_GROWTH_FACTOR (new)
  • RUBY_GC_HEAP_GROWTH_MAX_SLOTS (new)
  • RUBY_GC_MALLOC_LIMIT
  • RUBY_GC_MALLOC_LIMIT_MAX (new)
  • RUBY_GC_MALLOC_LIMIT_GROWTH_FACTOR (new)
  • RUBY_GC_OLDMALLOC_LIMIT (new)
  • RUBY_GC_OLDMALLOC_LIMIT_MAX (new)
  • RUBY_GC_OLDMALLOC_LIMIT_GROWTH_FACTOR (new)

Ruby 2.1.1 source

  • RUBY_GC_HEAP_OLDOBJECT_LIMIT_FACTOR (new)

Upvotes: 50

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