Experimental Physics and Industrial Control System
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We simply have patched base so that on
systems which support mlockall(2):
if the application is able (has appropriate privilege/resource
limits) to use SCHED_FIFO
then it tries mlockall(). If this fails (e.g., due to insufficient
RLIMIT_MEMLOCK) a warning is printed.
This way: if you give your IOC app privilege and resource limits
to use SCHED_FIFO and mlockall
then it will use them. If you don't then the app executes as an
ordinary (paged, SCHED_OTHER)
process.
- Till
On 05/14/2013 05:27 AM, Ralph Lange wrote:
All,
I just uploaded release 1.2 of
the mcoreutils module, i.e. Real-Time
Utilities for EPICS IOCs on Multi-Core Linux.
Apart from fixes in the documentation [1], this version adds
iocShell calls to lock a running IOC's virtual memory into RAM, to
avoid swapping and page faults, which would introduce delays and
non-deterministic timing behaviour. Thanks to Dirk Zimoch (PSI)
for contributing his code.
The mcoreutils module is hosted by the EPICS Applications project
on SourceForge. [2]
It requires Linux, and EPICS Base 3.15 (trunk, revision 12372 of
20 Sep 2012 or later).
Any contributions and ideas are very welcome!
Cheers,
~Ralph
[1]
http://epics.sourceforge.net/mcoreutils/
[2]
http://sourceforge.net/projects/epics/
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