Script to benchmark the initial request after a fork. Records stats and makes a flamegraph
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
REQUEST_URI = ARGV[0] || "http://0.0.0.0/" | |
REQUEST_OPTS = { | |
'REMOTE_ADDR' => "127.0.0.1", | |
'HTTP_HOST' => '0.0.0.0' | |
} | |
ARGV.clear | |
require "actionview_precompiler" | |
require "flamegraph" | |
require "./config/environment" | |
APP = Rack::Server.new.app | |
def run_in_fork | |
3.times { GC.start } | |
rd, wr = IO.pipe | |
pid = fork do | |
rd.close | |
3.times { GC.start } | |
result = yield | |
rescue Exception => exception | |
puts exception | |
puts exception.backtrace | |
ensure | |
wr.write(Marshal.dump(exception: exception, result: result)) | |
wr.close | |
Process.exit!(0) | |
end | |
Process.waitpid(pid) | |
wr.close | |
ret = Marshal.load(rd.read) | |
raise ret[:exception] if ret[:exception] | |
ret[:result] | |
end | |
def time_render | |
time = Benchmark.ms do | |
request_env = Rack::MockRequest.env_for(REQUEST_URI, REQUEST_OPTS) | |
status, env, body = APP.call(request_env) | |
body.each(&:to_s) | |
body.close if body.respond_to?(:close) | |
end | |
end | |
def run_flamegraph(name) | |
run_in_fork do | |
filename = "tmp/flamegraph_#{name}.html" | |
Flamegraph.generate(filename) do | |
time_render | |
end | |
nil | |
end | |
end | |
def measure(iterations = 100) | |
results = [] | |
iterations.times do | |
results << run_in_fork do | |
time_render | |
end | |
end | |
results | |
end | |
def print_stats(results, name) | |
File.open("results.csv", "a") do |f| | |
results.each do |result| | |
f.puts [name, result].join(",") | |
end | |
end | |
results = results.sort | |
n = results.size | |
p( | |
avg: results.sum / n, | |
p75: results[n * 75 / 100], | |
p95: results[n * 95 / 100], | |
p99: results[n * 99 / 100] | |
) | |
end | |
iter = 100 | |
File.write("results.csv", "name,time\n") | |
# Warm any caches outside the process (ex. memcache) | |
run_in_fork do | |
time_render | |
end | |
run_in_fork do | |
puts "cold" | |
run_flamegraph("cold") | |
results = measure(iter) | |
print_stats(results, "cold") | |
end | |
run_in_fork do | |
puts "precompiled" | |
ActionviewPrecompiler.precompile | |
run_flamegraph("precompiled") | |
results = measure(iter) | |
print_stats(results, "precompiled") | |
end | |
run_in_fork do | |
puts "warmed" | |
time_render | |
run_flamegraph("warmed") | |
results = measure(iter) | |
print_stats(results, "warmed") | |
end |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment