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Issue 826350 link

Starred by 1 user
Status: Duplicate
Merged: issue 819678
Owner: ----
Closed: Mar 2018
Cc:
erikc...@chromium.org
█ shrike@chromium.org
EstimatedDays: ----
NextAction: ----
OS: Mac
Pri: 2
Type: Bug



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When TaskManager is open browser CPU usage goes up by 50%

Project Member Reported by dskiba@chromium.org, Mar 27 2018 
Chrome Version: 65.0.3325.181 (Official Build) (64-bit)
OS: macOS 10.13.3

I have 3 Chrome windows with 40 tabs total.

When poking around I noticed that according to Chrome's TaskManager, browser consumes ~60% CPU.

I started investigating and found that when TaskManager is closed, browser CPU usage is ~5% (according to ActivityMonitor), but opening it browser CPU usage to ~60% (according to both TaskManager and macOS ActivityMonitor). Actually, according to ActivityMonitor CPU usage fluctuates between 5% and 60%, with a period of a second.

So I took a trace (use google@ account to view): https://drive.google.com/file/d/1jh2RTW-4bTP6qeBsT7cl5FRE2q8XFHGQ/view?usp=sharing

In there I can see repeated batches of work, each ~1s of length (taking ~1s of CPU), consisting of 124 tasks scheduled from Refresh function in task_group_sampler.cc.
BatchOfWork.png
25.6 KB View Download

Comment 1 by erikc...@chromium.org, Mar 27 2018

Mergedinto: 819678
Status: Duplicate (was: Available)
This is fixed on trunk:

https://bugs.chromium.org/p/chromium/issues/detail?id=819678

The calculation for non-memory-footprint columns was excessively CPU intensive.
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