Re: Utilities for EPICS on Multi-Core Linux

[Jack Smith <jacksmithvent2009@gmail.com>]

Hi Ralph,

> On Fri, Nov 23, 2012 at 2:48 PM, Ralph Lange <Ralph.Lange@gmx.de> wrote:
> MCoreUtils - Utilities for EPICS on Multi-Core Linux
>
> I recently started working on a collection of useful stuff for running IOCs
> on multi-core (RT or not) Linux architectures. (*)
>
> The first two modules are now available on SourceForge [1]:
>
> Real-time threadShow routines
> Enhanced threadShow functions that print LWP ID, scheduling policy, and CPU
> affinity.
>
> Rule-based setting of real-time properties
> Pattern matching engine that allows to set real-time properties of EPICS
> threads (scheduling policy, priority, and CPU affinity) by regular
> expression matching on thread names. Rules can be set in a config file or
> from the iocShell, and will be applied to any thread started through the
> libCom/OSI API of EPICS Base. This allows to restrict the complete IOC onto
> a subset of CPUs, dedicate CPUs to specific (driver) threads, fine-tune
> policies and priorities, etc.
>
> MCoreUtils need EPICS Base 3.15.0.1 or later, on a Linux platform.
>
> This project is in an early stage.
> I know that more and more EPICS sites are using this family of platforms and
> have to cope with similar things, so I would like to invite everybody to
> step forward with ideas and suggestions (and code!). I hope we can manage to
> minimize parallel developments, and combine efforts for a better real-time
> behaviour and performance of EPICS.
>
> Cheers,
> ~Ralph
>

I guess the purpose of MCoreUtils is to make Linux system (RT or not)
more deterministic. Right?

For EPICS base 3.14.x, how do the IOCs' threads use the CPU resources
on a multi-core Linux system? Do the threads just randomly pick up any
available CPU resource?

Thanks,

Jack