Use benchmark-ips

Gemfile

@@ -0,0 +1,3 @@
+source 'https://rubygems.org'
+
+gem 'benchmark-ips'

Gemfile.lock

@@ -0,0 +1,13 @@
+GEM
+  remote: https://rubygems.org/
+  specs:
+    benchmark-ips (2.12.0)
+
+PLATFORMS
+  arm64-darwin-22
+
+DEPENDENCIES
+  benchmark-ips
+
+BUNDLED WITH
+   2.3.7

block-ensure/README.md

@@ -1,5 +1,12 @@
 ```
-                   user     system      total        real
+Warming up --------------------------------------
-block          0.961390   0.008933   0.970323 (  0.978850)
+               block     1.000  i/100ms
-ensure         0.752044   0.006407   0.758451 (  0.763439)
+              ensure     1.000  i/100ms
+Calculating -------------------------------------
+               block      1.099  (± 0.0%) i/s -      6.000  in   5.460202s
+              ensure      1.400  (± 0.0%) i/s -      8.000  in   5.713243s
+
+Comparison:
+              ensure:        1.4 i/s
+               block:        1.1 i/s - 1.27x  slower
 ```

block-ensure/example.rb

@@ -1,6 +1,7 @@
 #!/usr/bin/env ruby
+# frozen_string_literal: true
 
-require 'benchmark'
+require 'benchmark/ips'
 
 class Example
   def initialize
@@ -20,10 +21,15 @@ class Example
   end
 end
 
-Benchmark.bm(12) do |x|
+Benchmark.ips do |x|
+  x.time = 5
+  x.warmup = 0.5
+
   ex = Example.new
   n = 10_000_000
 
   x.report('block') { n.times { ex.using_block } }
   x.report('ensure') { n.times { ex.using_ensure } }
+
+  x.compare!
 end