Re: High CPU in tasking

[Lutz Donnerhacke <lutz@iks-jena.de>]

* Nick Roberts wrote:
> I'm obviously only guessing at the details of your application, Lutz, but
> gleaning what I can, I'm surprised that you seem to be talking about one
> buffer.

Yep. The goal of the job is to decode a single data source and redistribute
the gained data to an unknown number of parallel readers with different
speeds.

> Do you not have a separate buffer for each reader (of a single
> demultiplexed stream)?

Yep. I do have a ringbuffer with a single "writer" and an indetermined
number of "readers". The data structure is a protected type with an entry
family for all readers.

> Also, what were the priorities of the tasks?

All the same. I'm currently testing with a data source of 1GB/h and eight
data sources of about half the rate. Each data source allocates a ringbuffer.

There are controlling tasks: A logger task writing to /dev/log, because
syslog(3) is not thread safe, and a supervisor task for handling the
commands on each the TCP session.