Approach to system testing for Osmocom stack

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Holger Freyther holger at
Wed Feb 7 09:31:16 UTC 2018

> On 4. Feb 2018, at 22:35, Holger Freyther <holger at> wrote:


> * SIGCHLD arrives
> * Something will be written into one end of a socketpair[1]
> * In the python code on wait(2) will be called on every registered process
> (

there is a way to switch to a child reaper that is using wait(-1.. but even
then we have two issues.

1.) If I use await asyncio.create_subprocess_exec... then we can't tick
with 50ms. On a 60s schedule to start 10k processes there is a delay of +60s.

2.) If I delay the process creation then I can almost keep the schedule most
of the time but we run into buffering exceptions and/or not all tasks are
started within a reasonable amount of time.

Knowing what I know now I would have gone for Go. It is made for the kind of
concurrency where python seems unusable. I hesitated to build my own event
loop but will build something that looks like our C apps in python (single
select, no async/await).


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