by jasonhall@google.com:
What does 'go version' print?
go version go1.3 linux/amd64
What steps reproduce the problem?
1. Run a benchmark ('go test -bench=.') on a suite that has differently-lengthed
benchmark names
What happened?
Output is disjointed and difficult to scan for relative benchmark times, e.g.:
$ go test -bench=.
PASS
BenchmarkSortInt64Reflect 50 45768737 ns/op
BenchmarkSortInt64New 50 48225829 ns/op
BenchmarkSortInt64Old 100 15282155 ns/op
BenchmarkSortInt32Reflect 50 48708838 ns/op
BenchmarkSortInt32New 50 48018021 ns/op
BenchmarkSortInt32Old 100 15299048 ns/op
BenchmarkSortStructReflect 50 49120054 ns/op
BenchmarkSortStructNew 50 49305384 ns/op
BenchmarkSortStructOld 100 18308491 ns/op
It's not immediately apparent that Reflect and New are roughly the same without copying
the output and aligning the values.
What should have happened instead?
Columns line up in an easy-to-read fashion, with ns/op and iterations values
right-aligned across benchmarks.
Please provide any additional information below.
Benchmark outputs are generated using a String() method that doesn't take into account
other benchmark results being printed:
http://golang.org/src/pkg/testing/benchmark.go#L256
An alternative would be to have each BenchmarkResult provide a []byte separating fields
with a \t and using the tabwriter package to align the results, periodically Flushing
the output. We would lose the streamed output that the current behavior provides, but
the columns would be aligned for easier consumption.
