Re: Debugging Firefox e10s with rr?

[Robert O'Callahan]

On Wed, Aug 30, 2017 at 1:16 AM, Kartikaya Gupta  wrote:

> rr works just fine with multiple processes. Once you have a recording
> you can use `rr ps` to show all the process that were recorded and `rr
> replay -p ` to attach to a particular process. You can combine -p
> with -g as Cameron mentioned to jump to a particular point in a
> particular process' lifetime.
>

You can also do "rr replay -p plugin-container" to debug the first
plugin-container process.

Rob
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Re: Debugging Firefox e10s with rr?

[Emilio Cobos Álvarez]

On 08/29/2017 03:16 PM, Kartikaya Gupta wrote:
> Once you have a recording
> you can use `rr ps` to show all the process that were recorded and `rr
> replay -p ` to attach to a particular process.

I see, so `rr ps` was the bit whose existence I was missing :)

Thanks a lot!

 -- Emilio
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Re: Debugging Firefox e10s with rr?

[Kartikaya Gupta]

rr works just fine with multiple processes. Once you have a recording
you can use `rr ps` to show all the process that were recorded and `rr
replay -p ` to attach to a particular process. You can combine -p
with -g as Cameron mentioned to jump to a particular point in a
particular process' lifetime.

On Tue, Aug 29, 2017 at 9:12 AM, Cameron McCormack  wrote:
> On Tue, Aug 29, 2017, at 08:58 PM, Emilio Cobos Álvarez wrote:
>> I didn't find any obvious docs in either the rr wiki[1] or MDN, so I
>> thought I'd ask before I actually need it.
>>
>> What is the best/easiest way to debug Firefox multi-process using rr?
>>
>> Right now I just disable e10s, but that's probably not a great long-term
>> solution...
>
> I do that too. :-)
>
> Mine is probably not the most efficient method, but most of the time I
> record with -M, and use output lines (either turning on logging, like
> RUST_LOG=debug, or adding printfs showing details of documents/elements)
> to orient myself when debugging.  Doing a "rr replay -g " for a
> particular output line will break in the process that printed out that
> line.  (I've never had to debug something under rr that involves the
> interaction between processes.)
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Re: Debugging Firefox e10s with rr?

[Cameron McCormack]

On Tue, Aug 29, 2017, at 08:58 PM, Emilio Cobos Álvarez wrote:
> I didn't find any obvious docs in either the rr wiki[1] or MDN, so I
> thought I'd ask before I actually need it.
> 
> What is the best/easiest way to debug Firefox multi-process using rr?
> 
> Right now I just disable e10s, but that's probably not a great long-term
> solution...

I do that too. :-)

Mine is probably not the most efficient method, but most of the time I
record with -M, and use output lines (either turning on logging, like
RUST_LOG=debug, or adding printfs showing details of documents/elements)
to orient myself when debugging.  Doing a "rr replay -g " for a
particular output line will break in the process that printed out that
line.  (I've never had to debug something under rr that involves the
interaction between processes.)
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Debugging Firefox e10s with rr?

[Emilio Cobos Álvarez]

Hi,

I didn't find any obvious docs in either the rr wiki[1] or MDN, so I
thought I'd ask before I actually need it.

What is the best/easiest way to debug Firefox multi-process using rr?

Right now I just disable e10s, but that's probably not a great long-term
solution...

 -- Emilio

[1]: https://github.com/mozilla/rr/wiki/Recording-Firefox
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