}
		cpu, err := strconv.Atoi(val)
		if err != nil || cpu <= 0 {
			fmt.Fprintf(os.Stderr, "testing: invalid value %q for -test.cpu\n", val)
			os.Exit(1)
		}
		cpuList = append(cpuList, cpu)
	}
	if cpuList == nil {
		cpuList = append(cpuList, runtime.GOMAXPROCS(-1))
	}
}

func shouldFailFast() bool {
	return *failFast && numFailed.Load() > 0

	// If no flag was specified, don't run benchmarks.
	if len(*matchBenchmarks) == 0 {
		return true
	}
	// Collect matching benchmarks and determine longest name.
	maxprocs := 1
	for _, procs := range cpuList {
		if procs > maxprocs {
			maxprocs = procs
		}
	}
	ctx := &benchContext{
		match:  newMatcher(matchString, *matchBenchmarks, "-test.bench", *skip),
		extLen: len(benchmarkName("", maxprocs)),
	}