+kentaro for some profiling insights
On Tue, Jun 11, 2013 at 7:24 AM, Adam Klein ad...@chromium.org wrote:
I'm trying to profile the v8 execution of a web app using Chromium's
content_shell with some success. But I'm also getting some odd
results. I'm using a commandline like:
Also, I'm a bit surprised at the way the v8 DOM callbacks end up in
the profile: those methods are usually trivial, with the real work
being somewhere deep in the core of Blink. Is it expected that only
the v8 entry point into Blink shows up when using the profiling tool?
I've played around
On Tue, Jun 11, 2013 at 7:24 AM, Adam Klein ad...@chromium.org wrote:
I'm trying to profile the v8 execution of a web app using Chromium's
content_shell with some success. But I'm also getting some odd
results. I'm using a commandline like:
content_shell --no-sandbox --js-flags='--prof
There is no direct way to get statistics about the objects are that are
collected, but you may be able to infer this information by looking at the
delta between live object counts between two GCs. You can track live object
counts by passing the --track_gc_object_stats flag to V8, which records
On 11 June 2013 17:11, Stephan Beal sgb...@googlemail.com wrote:
Please consider this construct:
function rowCallback(dbRow){
// Notes below ref to this scope
}
myDbDriver.query({
sql:SELECT * FROM T,
callback: rowCallback
});
That hypothetical code would run the given query and
Ugly but…
In JavaScript you can do something like this:
var o = { dbRow: whatever, rowNumber: whatever, colNames: whatever, colCount:
whatever };
with (o) {
function rowCallback() {
// dbRow would be accessible without the o. prefix, etc.
}
}
On Jun 11, 2013, at 8:30 AM, Andreas
On Tue, Jun 11, 2013 at 5:53 PM, Michael Schwartz myk...@gmail.com wrote:
with (o) {
Yeah, i was hoping to avoid the 'with'. i assume there is no
clean/portable/sane way to do this in JS, and to be honest the idea never
occurred to me until today while tinkering on my own pet scripting engine
I never understood why with is considered a bad thing. It's got a bad
reputation, though it has some real world use cases that make a lot of sense.
Granted v8 doesn't optimize code using it.
On Jun 11, 2013, at 9:06 AM, Stephan Beal sgb...@googlemail.com wrote:
On Tue, Jun 11, 2013 at 5:53
On 11 June 2013 18:11, Michael Schwartz myk...@gmail.com wrote:
I never understood why with is considered a bad thing. It's got a bad
reputation, though it has some real world use cases that make a lot of
sense.
One thing to realise is that every pile of poo in any language can be
motivated
The best use case I can think of for with is in templates.
Consider ejs style template:
head
title%= obj.title %/title
/head
body
% for (i=1; i6; i++) { %
divLine #%= i%/div
% } %
/body
/html
This gets compiled into a script like:
writeln('head');
write('title');
write(obj.title);
I've updated the code and no longer explicitly
calling obj.Dispose(isolateP), and my c++ object does get disposed when I
call LowMemoryNotification before terminating v8. The extra Dispose was
clearing my near death callback. This is good news and will greatly
simplify my design and assure all
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