* Re: Embedded Concurrency in Ada
1999-10-21 0:00 Embedded Concurrency in Ada Andrew Logue
@ 1999-10-21 0:00 ` Robert Dewar
0 siblings, 0 replies; 2+ messages in thread
From: Robert Dewar @ 1999-10-21 0:00 UTC (permalink / raw)
In article <8E65D75A8synoptikdamudderfuck@news>,
synoptik@home.com (Andrew Logue) wrote:
> Hi All,
> What is the maximum number of Ada tasks supported by the
> kernel? If there
> is no set limit, how can I determine the "point of no return",
> where task
> management overhead consumes, say 20% of total CPU power.
Surely this is something best asked to the vendor support
organization?
Sent via Deja.com http://www.deja.com/
Before you buy.
^ permalink raw reply [flat|nested] 2+ messages in thread
* Embedded Concurrency in Ada
@ 1999-10-21 0:00 Andrew Logue
1999-10-21 0:00 ` Robert Dewar
0 siblings, 1 reply; 2+ messages in thread
From: Andrew Logue @ 1999-10-21 0:00 UTC (permalink / raw)
Hi All,
I have an Ada specific question that is specific to embedded systems based
on the Rational (verdix) VADSNet kernel. The target platform has a single
40 MHZ processor. The Vads kernel provides system calls (memory
management, hardware interrupt management, task scheduling, etc.) and
system elaboration for a single Ada program. I believe the task
management/scheduling is implemented in C, but probably doesn't matter
anyway.
What is the maximum number of Ada tasks supported by the kernel? If there
is no set limit, how can I determine the "point of no return", where task
management overhead consumes, say 20% of total CPU power. This question
assumes that heap and code space are unlimited. At what point does context
switching/stack management overhead become detrimental to system
performance, especially in a real-time system?
Obviously the hard-line answer to this question lies with system timing
requirements, hardware constraints, etc. But is there a way to gather some
metrics on how much system CPU resources are "wasted" or eaten up by the
kernel itself?
Regards,
Andrew Logue
Systems Architect/Bug Squisher
Computing Devices Canada
andrew.logue@cdcgy.com
synoptik@home.com
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