View source for ThreadScope Tour/Zoom

== Objective ==

Use zooming to reveal more detailed performance issues

== Steps ==

<ol style="list-style-type: decimal;">
<li><p>Open the sudoku3 ThreadScope profile created [[ThreadScope_Tour/Profile2|earlier]]</p>
<pre>threadscope ./sudoku3.eventlog</pre></li>
<li><p>Notice the initial lack of activity at the very beginning of program execution</p>
[[Image:ThreadScope-sudoku3-initial.png|Ramping up]]

<p>What's going on there?</p></li>
<li><p>Use the zoom in button to explore that space a bit more</p>
<p>''Hint: you can also press +/- on the keyboard''</p>
[[Image:ThreadScope-zoom.png|Zooming in]]

<p>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.</p></li>
<li><p>While you're zoomed in, observe the link between activity and garbage collection.</p>
[[Image:ThreadScope-sudoku2-gc.png|Activity ceased during garbage collection]]
<p>Understanding your program's performance may require looking at different resolutions, zoomed out to get the overall feel, and sometimes zoomed in to notice finer patterns like these tiny bursts of work with interleaved garbage collection.</p>
</li>
</ol>

== Hints ==

* You can also press +/- on the keyboard to zoom in and out