diff --git a/src/cmd/dist/test.go b/src/cmd/dist/test.go
index 1309a0acdf..e7fd155ee4 100644
--- a/src/cmd/dist/test.go
+++ b/src/cmd/dist/test.go
@@ -1121,7 +1121,6 @@ func (t *tester) runPending(nextTest *distTest) {
 	var last *distTest
 	for ended < len(worklist) {
 		for started < len(worklist) && started-ended < maxbg {
-			//println("start", started)
 			w := worklist[started]
 			started++
 			w.start <- !t.failed || t.keepGoing
@@ -1142,7 +1141,6 @@ func (t *tester) runPending(nextTest *distTest) {
 		if vflag > 1 {
 			errprintf("%s\n", strings.Join(w.cmd.Args, " "))
 		}
-		//println("wait", ended)
 		ended++
 		<-w.end
 		os.Stdout.Write(w.out)
diff --git a/src/cmd/internal/obj/mips/asm0.go b/src/cmd/internal/obj/mips/asm0.go
index c08d97a9aa..77aa24a4f6 100644
--- a/src/cmd/internal/obj/mips/asm0.go
+++ b/src/cmd/internal/obj/mips/asm0.go
@@ -722,8 +722,6 @@ func (c *ctxt0) oplook(p *obj.Prog) *Optab {
 		a2 = C_REG
 	}
 
-	//print("oplook %P %d %d %d\n", p, a1, a2, a3);
-
 	ops := oprange[p.As&obj.AMask]
 	c1 := &xcmp[a1]
 	c3 := &xcmp[a3]
diff --git a/src/cmd/internal/obj/x86/asm6.go b/src/cmd/internal/obj/x86/asm6.go
index 93fd033460..1f668a0166 100644
--- a/src/cmd/internal/obj/x86/asm6.go
+++ b/src/cmd/internal/obj/x86/asm6.go
@@ -5114,7 +5114,6 @@ bad:
 	}
 
 	ctxt.Diag("invalid instruction: %v", p)
-	//	ctxt.Diag("doasm: notfound ft=%d tt=%d %v %d %d", p.Ft, p.Tt, p, oclass(ctxt, p, &p.From), oclass(ctxt, p, &p.To))
 }
 
 // byteswapreg returns a byte-addressable register (AX, BX, CX, DX)
diff --git a/src/runtime/mbitmap.go b/src/runtime/mbitmap.go
index 6fcdea1538..30ec5f1cc9 100644
--- a/src/runtime/mbitmap.go
+++ b/src/runtime/mbitmap.go
@@ -1667,15 +1667,12 @@ Run:
 			if n == 0 {
 				// Program is over; continue in trailer if present.
 				if trailer != nil {
-					//println("trailer")
 					p = trailer
 					trailer = nil
 					continue
 				}
-				//println("done")
 				break Run
 			}
-			//println("lit", n, dst)
 			nbyte := n / 8
 			for i := uintptr(0); i < nbyte; i++ {
 				bits |= uintptr(*p) << nbits
diff --git a/src/runtime/mem_aix.go b/src/runtime/mem_aix.go
index 56db7426af..660861a9f1 100644
--- a/src/runtime/mem_aix.go
+++ b/src/runtime/mem_aix.go
@@ -22,7 +22,6 @@ func sysAlloc(n uintptr, sysStat *uint64) unsafe.Pointer {
 			print("runtime: mmap: too much locked memory (check 'ulimit -l').\n")
 			exit(2)
 		}
-		//println("sysAlloc failed: ", err)
 		return nil
 	}
 	mSysStatInc(sysStat, n)
diff --git a/src/runtime/mheap.go b/src/runtime/mheap.go
index 9f4e75a7b1..1e61656489 100644
--- a/src/runtime/mheap.go
+++ b/src/runtime/mheap.go
@@ -1211,7 +1211,6 @@ HaveSpan:
 	*stat += uint64(npage << _PageShift)
 	memstats.heap_idle -= uint64(npage << _PageShift)
 
-	//println("spanalloc", hex(s.start<<_PageShift))
 	if s.inList() {
 		throw("still in list")
 	}