benchmark/README.md: add help output [ci skip]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63931 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 17 insertions, 0 deletions

diff --git a/benchmark/README.md b/benchmark/README.md
index 8a46fea636..a70aedf578 100644
--- a/benchmark/README.md
+++ b/benchmark/README.md
@@ -18,6 +18,23 @@ benchmark-driver benchmark/*.yml -e /path/to/ruby -e '/path/to/ruby --jit'
 benchmark-driver benchmark/*.yml --rbenv '2.5.1;2.6.0-preview2 --jit'
 ```
 
+See also:
+
+```console
+$ benchmark-driver --help
+Usage: benchmark-driver [options] [YAML|RUBY]
+    -r, --runner [TYPE]              Specify runner type: ips, time, memory, once (default: ips)
+    -o, --output [TYPE]              Specify output type: compare, simple, markdown, record (default: compare)
+    -e, --executables [EXECS]        Ruby executables (e1::path1,arg1,...; e2::path2,arg2;...)
+        --rbenv [VERSIONS]           Ruby executables in rbenv (x.x.x,arg1,...;y.y.y,arg2,...;...)
+        --repeat-count [NUM]         Try benchmark NUM times and use the fastest result or the worst memory usage
+        --repeat-result [TYPE]       Yield "best", "average" or "worst" result with --repeat-count (default: best)
+        --bundler                    Install and use gems specified in Gemfile
+        --filter [REGEXP]            Filter out benchmarks with given regexp
+        --run-duration [SECONDS]     Warmup estimates loop_count to run for this duration (default: 3)
+    -v, --verbose                    Verbose mode. Multiple -v options increase visilibity (max: 2)
+```
+
 ## make benchmark
 
 Using `make benchmark`, `make update-benchmark-driver` automatically downloads