0.16.0's analyze-profile --html output is exceedingly large

[jin]

Description of the problem / feature request:

In 0.16.0rc1, the HTML profile generated from bazel analyze-profile --html is exceedingly large, containing timestamp <div> elements like the following:

<div style='position: absolute; left: 10505400px; top: -20px; width: 1px; height: 40px; border-left: 1px solid rgba(128,128,128,1.000000)'></div>
<div style="position:absolute; left:10505454px; top:-17px; width:50px; height:10px">210109s</div>
<div style='position: absolute; left: 10505450px; top: -20px; width: 1px; height: 40px; border-left: 1px solid rgba(128,128,128,1.000000)'></div>
<div style="position:absolute; left:10505504px; top:-17px; width:50px; height:10px">210110s</div>
<div style='position: absolute; left: 10505500px; top: -20px; width: 1px; height: 40px; border-left: 1px solid rgba(128,128,128,1.000000)'></div>

A HTML profile on //examples/cpp:hello-world is 48MB and has 420511 lines:

$ wc -l 0.16.0rc1.prof.html
  420511 0.16.0rc1.prof.html
$ ls -lh 0.16.0rc1.prof.html
-rw-r--r--  1 jingwen  5001    48M Jul 20 23:22 0.16.0rc1.prof.html

For comparison, the same profile generated from 0.15.2 is 279 lines:

$ wc -l 0.15.2.prof.html
     279 0.15.2.prof.html

Bugs: what's the simplest, easiest way to reproduce this bug? Please provide a minimal example if possible.

Build any target using Bazel 0.16.0 RC with --profile=prof.dat, and bazel analyze-profile --html prof.dat

What operating system are you running Bazel on?

macOS

What's the output of bazel info release?

0.16.0rc1

[jin]

cc @meisterT @ulfjack could this be related to the recent profiler changes?

[jin]

Bisected to 15b8c25

[ulfjack]

Fixed in f45c224. @lberki