ThreadScope Tour/Zoom

From HaskellWiki

1 Objectives

• Use zooming to reveal more detailed performance issues
• Save your place with the bookmark feature and zoom back out

2 Steps

1. Open the sudoku3 ThreadScope profile created earlier

   threadscope ./sudoku3.eventlog

2. Notice the initial lack of activity at the very beginning of program execution

   

   alt=Ramping up

   What's going on there?

3. Use the zoom in button to explore that space a bit more (Hint: you can also press +/- on the keyboard)

   

   alt=Zooming in

   Notice how different the profile looks close up. What do you see? At closer inspection what looks like a moderate amount of activity is actually intense bursts using both cores, with pauses in between.

4. Save the point in the zoomed-in profile as a bookmark. To do so, click in the graph to move the blue cursor to a spot of your choice.

   

   alt=Click!

   Then switch to bookmarks tab. Press the plus button to create the bookmark and click in the labels field to name it.

   Image:ThreadScope-bookmarks.png

   alt=The bookmark tab
   

   alt=Adding a label