Experimental Physics and
Industrial Control System

Thomas Birke <[email protected]> · Wed, 04 Feb 2009 13:48:22 +0100

Noboru Yamamoto wrote:

Hi,

We encountered same problem when we building KEKB control system.
Our solution is to modify EPICS base and provide API to access a part of

source waveform. And also we created a record named

CompactSubArrayRecord, which uses API above and copy data just it needs.

Unfortunately this mechanism works only for DB-link but not for CA-link.

(We will need to extend CA protocol to access a part of waveform

data,say channel name like "myWaveFormRecord[10:20]")

And also you need to change source code of base.
We have been using this version of modified base in KEKB and J-PARC and
encounters no problem caused by this change.

I found your earlier posts on tech-talk also. Thank you very much.

I just looked at the memory consumption of the softIoc running my

subArrays and finally decided that using a few MB of a reasonable sized

Linux-Machine is not enough reason to get deeper into this and even

patch base for this single purpose. I can live with the higher memory

footprint.

I just stumbled over an unnecessarily high (at first glance) memory usage.

But if one runs into this problem on an IOC with just a few MB of

memory, your solution seems just perfect to solve this issue.

Thanks again,
Thomas

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Thomas Birke
Operation Controls

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Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System