// second GC to force sweep completion so we
			// get a complete snapshot of the live heap at
			// the end of this phase.
			runtime.GC()
			f, err := os.Create(makePProfFilename(m.filebase, m.curMark.name, "memprof"))
			if err != nil {
				panic(err)
			}
			err = pprof.WriteHeapProfile(f)
			if err != nil {
				panic(err)
			}
			err = f.Close()
			if err != nil {
				panic(err)
			}
		}
	}

		}

		top, err := cmd.CombinedOutput()
		t.Logf("%s:\n%s", cmd.Args, top)
		if err != nil {
			t.Error(err)
		} else if !bytes.Contains(top, []byte("MemProf")) {
			t.Error("missing MemProf in pprof output")
		}
	}
}

var concurrentMapTest = flag.Bool("run_concurrent_map_tests", false, "also run flaky concurrent map tests")

func TestConcurrentMapWrites(t *testing.T) {