How do I read the output of the Pulse Logger?

Scott Palmer swpalmer at
Tue Mar 15 16:14:57 UTC 2016

Is there a guideline somewhere that explains how to read the output of the Pulse Logger?

For example, what do the two times represent in this PULSE line:

	PULSE: 569 [1459ms:270ms]

At first I guessed is that it was PULSE: <current_pulse_#>  [<layout time>ms:<time_for_everything_else>]
but that doesn’t seem to hold up.

What does the first (usually negative) number mean in the Layout Pass line?

	T23 (-1563 +1563ms): Layout Pass

	T23 (1 +4ms): Layout Pass

I’ve noticed that the output has some notable differences between my Windows machine and my Mac. On the Mac I don’t seem to be getting the same sort of CSS Pass information.  I get only one “CSS Pass” per pulse and it is almost always telling me something near 0ms:

	PULSE: 509 [1404ms:286ms]
	T23 (-1404 +1404ms): Layout Pass
	T23 (0 +1ms): CSS Pass
	T23 (1 +6ms): Layout Pass
	T23 (7 +4ms): Update bounds
	T23 (11 +0ms): Waiting for previous rendering
	T23 (11 +0ms): Copy state to render graph

but on Windows I get two CSS Passes, one is usually 0ms, the other makes more sense (I’m investigating a performance issue on a Scene with >10k nodes, so some notable amount of CSS time is expected.):

	PULSE: 2578 [423ms:3362ms] 
	T35 (-423 +423ms): Layout Pass 
	T35 (0 +0ms): CSS Pass 
	T35 (0 +0ms): Layout Pass 
	T35 (0 +2725ms): CSS Pass 
	T35 (2725 +402ms): Layout Pass 
	T35 (3128 +25ms): Update bounds 

This seems a bit strange, as I would think Layout and CSS would not be platform specific. Both systems are running 8u72.
I’m also finding Layout times on the Mac are higher than I expected - maybe some CSS time has been rolled in to that log line on the Mac?



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