I tried moving SetFlagsFromCommandLine() to be the first V8 API call
(before any initialization takes place), and running my application again.
After executing linux-tick-processor on the new log file, it looks like d8
is crashing after 5 seconds into its run.
# tools/linux-tick-processor /mydir/isolate-0x7f566004dbb0-v8.log
which: no d8 in
(/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/root/depot_tools:/usr/lib/vslick/bin:/usr/lib/jvm/java-1.7.0/bin)
tools/linux-tick-processor: line 41: 2855 Broken pipe cat
$log_file
2856 Segmentation fault | $d8_exec $tools_path/splaytree.js
$tools_path/codemap.js $tools_path/csvparser.js $tools_path/consarray.js
$tools_path/profile.js $tools_path/profile_view.js $tools_path/logreader.js
$tools_path/tickprocessor.js $tools_path/SourceMap.js
$tools_path/tickprocessor-driver.js -- $@ 2> /dev/null
Adding --nocompact_code_space makes no difference. The crash is still
there. Please assist.
On Monday, May 2, 2016 at 1:47:58 PM UTC+3, Ben Noordhuis wrote:
>
> On Sun, May 1, 2016 at 2:45 PM, Danny Dorfman <[email protected]
> <javascript:>> wrote:
> > Hello there,
> >
> > I have been trying to activate V8;s internal profiler by running
> > V8::SetFlagsFromCommandLine() from my code (with "--log-timer-events"
> and
> > "--prof" as parameters). The code runs, and several log files are
> created.
> > I tried processing the log files with tools/linux-tick-processor, but
> the
> > script aborts with this error:
> >
> > Code move event for unknown code: 0x2d6bba36c7a0
> > Statistical profiling result from /mydir/isolate-0x7f498c04dbc0-v8.log,
> (0
> > ticks, 0 unaccounted, 0 excluded).
> >
> > Any idea what this means? The log file has a lot of lines in it, but I
> think
> > the relevant segment looks like this:
> > ...
> > code-move,0x2d6bba45fdc0,0x2d6bba52e080
> > code-move,0x2d6bba45fea0,0x2d6bba52e160
> > code-move,0x2d6bba36c7a0,0x2d6bba52e220
> > code-move,0x2d6bba36c920,0x2d6bba52e3a0
> > code-move,0x2d6bba36cb60,0x2d6bba52e5e0
> > ...
> >
> > I use the latest build of version 4.9.
> >
> > Regards,
> > Danny
>
> I assume V8 is already running by the time you call
> SetFlagsFromCommandLine()?
>
> The warning you see is what you get when tickprocessor.js sees ticks
> in JS code that existed before the profiler was started, because those
> don't have a corresponding code-creation entry in the log file.
>
> You could try including --nocompact_code_space but YMMV; use at your own
> risk.
>
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