Closed Bug 1367876 Opened 7 years ago Closed 2 years ago

Slice counts/times not adding up in GC profile JSON

Categories

(Core :: JavaScript: GC, defect, P3)

Product:
Core
Component:
JavaScript: GC
Type:
defect

Tracking

()

Status:
RESOLVED INCOMPLETE

People

(Reporter: sfink, Unassigned)

Details

(Keywords: triage-deferred) 

https://perfht.ml/2qhaYXS is a profile that reports a 9-slice major GC taking a total_time of 65.867ms. But I only see 5 slices in the log between the end of the last major GC and the end of this one. Their pause times are:

787/timings/pause = 10.008
795/timings/pause = 10.036
801/timings/pause = 7.24
808/timings/pause = 42.57
882/timings/pause = 10.012

which comes to 79.866ms.

So (1) where are the missing 4 slices, and (2) why is the major GC total_time < sum(slice pause times)?
Keywords: triage-deferred
Priority: -- → P3

Much has changed, and I haven't noticed anything like this for a while. It is possible that some slice triggering paths were not reporting?

Status: NEW → RESOLVED
Closed: 2 years ago
Resolution: --- → INCOMPLETE
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