On 09.03.2018 19:52, Patrick Poggi wrote:
Hello,
Bhanu and I are both NCSU student that will be working on the http archive
support project.(
https://github.com/servo/servo/wiki/HTTP-archive-support-project)
At the moment, we are unsure of how to proceed with the project. Any
suggestions or direction would be helpful, as this is our first time
contributing to an open-source project.
Isn't that just writing detailed log files ?
I'd seriously suggest *NOT* writing HAR files directly, *NOR* collecting
all records in some central buffer - introduces all sorts of concurrency
problems (not even speaking of multiprocess issues) as well as inter-
dependencie of many subsystems, which in turn requires much lock/wait
issues, therefore distorts the measurement itself.
Instead just add simplicistic logging to various areas you're interested
in (please make it compile-time configurable - at least until we have an
kprobes-alike runtime code-path configuration ...) and take care that
the log-writing is as fast and simple and non-intrusive as possible.
Just write out the few bits (w/ exact timestamps), standard formats, etc
(could also be arch-specific binary encoding). Pulling things together
into formats like har, human-readable logs, etc, should be done
separately - that code should be available as a separate command line
program (one might wanna run this on separate machines).
The approach described in the Wiki page is unnecessarily complex and
risks adding a lot latency and subtle bugs. I'm opposed to that.
--mtx
--
Enrico Weigelt, metux IT consult
Free software and Linux embedded engineering
i...@metux.net -- +49-151-27565287
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