Forked from brianhempel/bench_rails_memory_usage.rb
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August 29, 2015 14:16
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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 | |
XRUBY_GC_HEAP_OLDOBJECT_LIMIT_FACTOR=2.0 | |
XRUBY_GC_MALLOC_LIMIT=16777216 | |
XRUBY_GC_MALLOC_LIMIT_MAX=33554432 | |
XRUBY_GC_MALLOC_LIMIT_GROWTH_FACTOR=1.4 | |
XRUBY_GC_OLDMALLOC_LIMIT=16777216 | |
XRUBY_GC_OLDMALLOC_LIMIT_MAX=134217728 | |
XRUBY_GC_OLDMALLOC_LIMIT_GROWTH_FACTOR=1.2 | |
rails server -p3009 > /dev/null | |
EOC | |
sleep 0.1 until alive? | |
end | |
def alive? | |
system("curl http://localhost:3009/ &> /dev/null") | |
end | |
def stop_server | |
Process.kill "HUP", server_pid | |
Process.wait @child | |
end | |
def server_pid | |
`cat tmp/pids/server.pid`.to_i | |
end | |
def memory_size_mb | |
(`ps -o rss= -p #{server_pid}`.to_i * 1024).to_f / 2**20 | |
end | |
# In /etc/hosts I have api.rails.local set to 127.0.0.1 for | |
# API testing on any app. Curl freaks out and takes extra | |
# seconds to do the request to these .local things, so we | |
# will use Net::HTTP for moar speed. | |
def do_request | |
uri = URI("http://api.rails.local:3009/memory_heavy_action") | |
req = Net::HTTP::Get.new(uri) | |
# Remove the next line if you don't need HTTP basic authentication. | |
req.basic_auth("user@example.com", "password") | |
req["Content-Type"] = "application/json" | |
Net::HTTP.start("localhost", uri.port) do |http| | |
http.read_timeout = 60 | |
http.request(req) | |
end | |
end | |
results = [] | |
# You can’t just measure once: memory usage has some variance. | |
# We will take the mean of 7 runs. | |
7.times do | |
start_server | |
used_mb = nil | |
(1..30).map do |n| | |
print "Request #{n}..." | |
do_request | |
used_mb = memory_size_mb | |
puts "#{used_mb} MB" | |
end | |
final_mb = used_mb | |
results << final_mb | |
puts "Final Memory: #{final_mb} MB" | |
stop_server | |
end | |
mean_final_mb = results.reduce(:+) / results.size | |
puts "Mean Final Memory: #{mean_final_mb} MB" |
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