https://git.ruby-lang.org/ruby.git/commit/?id=caa90202c9

From caa90202c9d2acbb9bce32ceebe6166c2f1de5d0 Mon Sep 17 00:00:00 2001
From: Takashi Kokubun <takashikkbn@g...>
Date: Mon, 10 Jun 2019 22:04:51 +0900
Subject: Make sure to suppress .irbrc on benchmark

By the way, this is already improved by nobu:

```
$ benchmark-driver benchmark/irb_exec.yml --rbenv '2.6.3;2.7.0-preview1;before;after' -v
2.6.3: ruby 2.6.3p62 (2019-04-16 revision 67580) [x86_64-linux]
2.7.0-preview1: ruby 2.7.0preview1 (2019-05-31 trunk c55db6aa271df4a689dc8eb0039c929bf6ed43ff) [x86_64-linux]
before: ruby 2.7.0dev (2019-06-10T21:13:14+09:00 master 973fd18f11) [x86_64-linux]
after: ruby 2.7.0dev (2019-06-10T21:18:56+09:00 master 976c689ad4) [x86_64-linux]
Calculating -------------------------------------
                          2.6.3  2.7.0-preview1      before       after
            irb_exec     11.868           5.872       6.297      10.278 i/s -      30.000 times in 2.527776s 5.108997s 4.764167s 2.918821s

Comparison:
                         irb_exec
               2.6.3:        11.9 i/s
               after:        10.3 i/s - 1.15x  slower
              before:         6.3 i/s - 1.88x  slower
      2.7.0-preview1:         5.9 i/s - 2.02x  slower

```

diff --git a/benchmark/irb_exec.yml b/benchmark/irb_exec.yml
index 5575c00..28933f8 100644
--- a/benchmark/irb_exec.yml
+++ b/benchmark/irb_exec.yml
@@ -1,10 +1,10 @@ https://github.com/ruby/ruby/blob/trunk/benchmark/irb_exec.yml#L1
 prelude: |
   # frozen_string_literal: true
   require 'rbconfig'
-  irb = File.join(File.dirname(RbConfig.ruby), 'irb')
+  irb_f = [File.join(File.dirname(RbConfig.ruby), 'irb'), '-f']
 benchmark:
   irb_exec: |
-    IO.popen(irb, 'w') do |io|
+    IO.popen(irb_f, 'w') do |io|
       io.write('exit')
     end
 loop_count: 30
-- 
cgit v0.10.2


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