EPICS Multi-Core Utilities  1.2
Real-Time Utilities for EPICS IOCs on Multi-Core Linux
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EPICS Multi-Core Utilities

Scope of this Document

This documentation covers the C API and the iocShell commands of the EPICS Multi-Core Utilities.


The EPICS Multi-Core Utilities library contains tools that allow tweaking of real-time parameters for EPICS IOC threads running on multi-core processors under the Linux operating system.

These tools are intended to set up multi-core IOCs for fast controllers, by:

Advanced Thread Show Routines

An extended version of the epicsThreadShow() command, showing scheduling policy and CPU affinity in addition to the usual output.

Details can be found in the documentation for module Real-Time threadShow Routines.

Rule Based Real-Time Property Manipulation

A module allowing to specify rules, which consist of a regular expression to match the thread name against, and a set of commands that allow to specify the real-time properties of a thread.

Whenever the EPICS IOC starts a thread, its name is matched against all existing rules, and for matching rules the commands are applied.

Details can be found in the documentation for module Rule-Based Thread Properties.

The default priorities of the EPICS IOC threads are well-chosen. They have been proven to ensure reliable IOC operation and communication, in many installations, under a variety of circumstances.
Manipulating the real-time properties, especially scheduling policies and priorities, may have unwanted side effects. Use this feature sparingly, and test well.

Memory Locking

A module allowing to lock the IOC process virtual memory into RAM. This makes sure that no swapping occurs, and thus avoids page faults which would introduce latency and lead to indeterministic timing.

Details can be found in the documentation for module Memory Locking.


Releases can be found at http://sourceforge.net/projects/epics/files/mcoreutils/

The sources are versioned using Mercurial. They can be viewed at http://epics.hg.sourceforge.net/hgweb/epics/mcoreutils/ or checked out using

hg clone http://epics.hg.sourceforge.net:8000/hgroot/epics/mcoreutils




To use the Multi-Core Utilities in an IOC application tree, you have to add a definition to .../configure/RELEASE that points to the location of the mcoreutils module.

In the directory that builds your IOC binary, the Makefile has to make sure the IOC is only built for Linux. Then add the dbd file and the Library, e.g.:

PROD_IOC_Linux = mcutest
mcutest_DBD += mcoreutils.dbd
mcutest_LIBS += mcoreutils

That's it. Enjoy!