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testing: add -test.count flag to run tests and benchmarks multiple times

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The flag is available from the go test command as -count:

% go test -run XXX -bench . -count 3
PASS
BenchmarkSprintfEmpty      	30000000	        54.0 ns/op
BenchmarkSprintfEmpty      	30000000	        51.9 ns/op
BenchmarkSprintfEmpty      	30000000	        53.8 ns/op
BenchmarkSprintfString     	10000000	       238 ns/op
BenchmarkSprintfString     	10000000	       239 ns/op
BenchmarkSprintfString     	10000000	       234 ns/op
BenchmarkSprintfInt        	10000000	       232 ns/op
BenchmarkSprintfInt        	10000000	       226 ns/op
BenchmarkSprintfInt        	10000000	       225 ns/op
...

If -cpu is set, each test is run n times for each cpu value.

Original by r (CL 10663).

Change-Id: If3dfbdf21698952daac9249b5dbca66f5301e91b
Reviewed-on: https://go-review.googlesource.com/10669
Reviewed-by: Rob Pike <r@golang.org>
Reviewed-by: Josh Bleecher Snyder <josharian@gmail.com>
This commit is contained in:
Russ Cox 2015-06-03 22:21:07 -04:00
parent de305a197f
commit fddc3ca11c
4 changed files with 18 additions and 2 deletions
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5
src/cmd/go/alldocs.go
View File

@ -1135,6 +1135,11 @@ control the execution of any test:
if -test.blockprofile is set without this flag, all blocking events
are recorded, equivalent to -test.blockprofilerate=1.
-count n
Run each test and benchmark n times (default 1).
If -cpu is set, run n times for each GOMAXPROCS value.
Examples are always run once.
-cover
Enable coverage analysis.

5
src/cmd/go/test.go
View File

@ -141,6 +141,11 @@ control the execution of any test:
if -test.blockprofile is set without this flag, all blocking events
are recorded, equivalent to -test.blockprofilerate=1.
-count n
Run each test and benchmark n times (default 1).
If -cpu is set, run n times for each GOMAXPROCS value.
Examples are always run once.
-cover
Enable coverage analysis.

1
src/cmd/go/testflag.go
View File

@ -55,6 +55,7 @@ var testFlagDefn = []*testFlagSpec{
{name: "bench", passToTest: true},
{name: "benchmem", boolVar: new(bool), passToTest: true},
{name: "benchtime", passToTest: true},
{name: "count", passToTest: true},
{name: "coverprofile", passToTest: true},
{name: "cpu", passToTest: true},
{name: "cpuprofile", passToTest: true},

9
src/testing/testing.go
View File

@ -172,6 +172,7 @@ var (
// Report as tests are run; default is silent for success.
chatty = flag.Bool("test.v", false, "verbose: print additional output")
count = flag.Uint("test.count", 1, "run tests and benchmarks `n` times")
coverProfile = flag.String("test.coverprofile", "", "write a coverage profile to the named file after execution")
match = flag.String("test.run", "", "regular expression to select tests and examples to run")
memProfile = flag.String("test.memprofile", "", "write a memory profile to the named file after execution")
@ -724,9 +725,13 @@ func parseCpuList() {
fmt.Fprintf(os.Stderr, "testing: invalid value %q for -test.cpu\n", val)
os.Exit(1)
}
cpuList = append(cpuList, cpu)
for i := uint(0); i < *count; i++ {
cpuList = append(cpuList, cpu)
}
}
if cpuList == nil {
cpuList = append(cpuList, runtime.GOMAXPROCS(-1))
for i := uint(0); i < *count; i++ {
cpuList = append(cpuList, runtime.GOMAXPROCS(-1))
}
}
}