brianhempel
/ bench_rails_memory_usage.rb
Last active
August 28, 2025 07:07
A script to test the memory usage of your Rails application over time. It will run 30 requests against the specified action and report the final RSS. Choose the URL to hit on line 45 and then run with `ruby bench_rails_memory_usage.rb`.
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| require "net/http" | |
| def start_server | |
| # Remove the X to enable the parameters for tuning. | |
| # These are the default values as of Ruby 2.2.0. | |
| @child = spawn(<<-EOC.split.join(" ")) | |
| XRUBY_GC_HEAP_FREE_SLOTS=4096 | |
| XRUBY_GC_HEAP_INIT_SLOTS=10000 | |
| XRUBY_GC_HEAP_GROWTH_FACTOR=1.8 | |
| XRUBY_GC_HEAP_GROWTH_MAX_SLOTS=0 |