Re: [MirageOS-devel] Mirage tracing

[Thomas Leonard <talex5@xxxxxxxxx>]

On 9 October 2014 13:54, Anil Madhavapeddy <anil@xxxxxxxxxx> wrote:
> On 9 Oct 2014, at 12:25, Thomas Leonard <talex5@xxxxxxxxx> wrote:
>
>> On 9 October 2014 11:25, Thomas Gazagnaire <thomas@xxxxxxxxxxxxxx> wrote:
>>>>> I'm currently working on improving the profiling support in Mirage.
>>>>> Previously [1], I was just graphing stats in libreoffice and looking
>>>>> at call traces, but I've been thinking about how to get more useful
>>>>> data.
>>>>>
>>>>> Tracing individual functions was too fine-grained, I think, and failed
>>>>> to follow Lwt threads, so I intrumented Lwt to record when threads are
>>>>> created and resolved, and the interactions between them. Graphing the
>>>>> results looks like this:
>>>>>
>>>>> http://test.roscidus.com/static/block-read-mirage-x86.png
>>>>>
>>>>> ( trace file: http://test.roscidus.com/static/log-x86.sexp )
>>>
>>> That's pretty cool! That would be even cooler to have a HTML/CSS/javascript 
>>> output on a "debug" port for any unikernel :-)
>>
>> It's using cairo for rendering, so producing png or svg output should
>> be easy. My javascript skills aren't up to making it zoom smoothly in
>> a browser though...
>
> Regarding rendering, Daniel Buenzli's Vz library does have a js_of_ocaml
> backend, so this may be a good place to get started on a browser backend
> without the trouble of learning HTML/CSS:
>
>   http://erratique.ch/software/vg

I almost had it working with Vg, but there seemed to be no way to
measure the text, which is needed to place the labels, so I ended up
using HTML canvas directly. As it turned out, that API was a better
fit for me anyway (being more similar to Cairo's API).

You can test it here:

http://test.roscidus.com/static/html_viewer.html?t_min=8249.530963&t_max=8249.534574

Scroll to zoom and drag to scroll as usual. Tested on Linux with
Firefox and Chromium; let me know if it works elsewhere.

It doesn't support touch, so won't work on tablets (also, would
probably be very slow).

> I'll send an update on Conduit soon, but Dave Scott has added sufficient
> Cohttp support that we could expose a Cohttp/Vchan from a unikernel and
> access it via Linux userspace.  In other words: you can use Chrome or Firefox
> to access the debugging port without going through TCP, which is pretty
> cool :-)

> -anil



-- 
Dr Thomas Leonard        http://0install.net/
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