diff --git a/test/threads_exec.jl b/test/threads_exec.jl
index 00bd6a7684604..e62e2b42602ac 100644
--- a/test/threads_exec.jl
+++ b/test/threads_exec.jl
@@ -894,7 +894,7 @@ end
                 put!(c,1)
             end
             @async begin
-                sleep(0.01)
+                #sleep(0.01)
                 r = take!(c)
             end
         end
@@ -907,7 +907,7 @@ end
         c = Channel(0)
         @sync begin
             @async begin
-                sleep(0.01)
+                #sleep(0.01)
                 r = take!(c)
             end
             @async begin
@@ -927,7 +927,7 @@ end
                 put!(c,1)
             end
             @async begin
-                sleep(0.01)
+                #sleep(0.01)
                 undefined()
                 r = take!(c)
             end
@@ -942,7 +942,7 @@ end
         c = Channel(0)
         f = () -> @sync begin
             @async begin
-                sleep(0.01)
+                #sleep(0.01)
                 undefined()
                 r = take!(c)
             end
@@ -964,7 +964,7 @@ end
                 put!(c,1)
             end
             Threads.@spawn begin
-                sleep(0.01)
+                #sleep(0.01)
                 r = take!(c)
             end
         end
@@ -977,7 +977,7 @@ end
         c = Channel(0)
         @sync begin
             Threads.@spawn begin
-                sleep(0.01)
+                #sleep(0.01)
                 r = take!(c)
             end
             Threads.@spawn begin
@@ -996,7 +996,7 @@ end
                 put!(c,1)
             end
             Threads.@spawn begin
-                sleep(0.01)
+                #sleep(0.01)
                 undefined()
                 r = take!(c)
             end
@@ -1010,7 +1010,7 @@ end
         c = Channel(0)
         f = () ->@sync begin
             Threads.@spawn begin
-                sleep(0.01)
+                #sleep(0.01)
                 undefined()
                 r = take!(c)
             end
@@ -1031,7 +1031,7 @@ end
                 put!(c,1)
             end
             Threads.@spawn begin
-                sleep(0.01)
+                #sleep(0.01)
                 r = take!(c)
             end
         end
@@ -1044,7 +1044,7 @@ end
         c = Channel(0)
         @sync begin
             @async begin
-                sleep(0.01)
+                #sleep(0.01)
                 r = take!(c)
             end
             Threads.@spawn begin
@@ -1063,7 +1063,7 @@ end
                 put!(c,1)
             end
             Threads.@spawn begin
-                sleep(0.01)
+                #sleep(0.01)
                 undefined()
                 r = take!(c)
             end
@@ -1077,7 +1077,7 @@ end
         c = Channel(0)
         f = () ->@sync begin
             @async begin
-                sleep(0.01)
+                #sleep(0.01)
                 undefined()
                 r = take!(c)
             end
@@ -1098,7 +1098,7 @@ end
                 put!(c,1)
             end
             @async begin
-                sleep(0.01)
+                #sleep(0.01)
                 r = take!(c)
             end
         end
@@ -1111,7 +1111,7 @@ end
         c = Channel(0)
         @sync begin
             Threads.@spawn begin
-                sleep(0.01)
+                #sleep(0.01)
                 r = take!(c)
             end
             @async begin
@@ -1130,7 +1130,7 @@ end
                 put!(c,1)
             end
             @async begin
-                sleep(0.01)
+                #sleep(0.01)
                 undefined()
                 r = take!(c)
             end
@@ -1144,7 +1144,7 @@ end
         c = Channel(0)
         f = () ->@sync begin
             Threads.@spawn begin
-                sleep(0.01)
+                #sleep(0.01)
                 undefined()
                 r = take!(c)
             end