--- /dev/null
+// Copyright 2014 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+/*
+
+Deprecated: benchcmp is deprecated in favor of benchstat: golang.org/x/perf/cmd/benchstat
+
+The benchcmp command displays performance changes between benchmarks.
+
+Benchcmp parses the output of two 'go test' benchmark runs,
+correlates the results per benchmark, and displays the deltas.
+
+To measure the performance impact of a change, use 'go test'
+to run benchmarks before and after the change:
+
+ go test -run=NONE -bench=. ./... > old.txt
+ # make changes
+ go test -run=NONE -bench=. ./... > new.txt
+
+Then feed the benchmark results to benchcmp:
+
+ benchcmp old.txt new.txt
+
+Benchcmp will summarize and display the performance changes,
+in a format like this:
+
+ $ benchcmp old.txt new.txt
+ benchmark old ns/op new ns/op delta
+ BenchmarkConcat 523 68.6 -86.88%
+
+ benchmark old allocs new allocs delta
+ BenchmarkConcat 3 1 -66.67%
+
+ benchmark old bytes new bytes delta
+ BenchmarkConcat 80 48 -40.00%
+
+*/
+package main // import "golang.org/x/tools/cmd/benchcmp"