Re: Listing channels

[Noboru Yamamoto <noboru.yamamoto@kek.jp>]

Jeff Hill wrote:
>> 1. Is there a method or application anywhere that can generate a list of
>> the channels on a remote IOC?  I mean, a program I can point at the
>> IOC's address and have it generate a list of all the channels on that
>> unit?
> 
>>From my perspective...
> 
> Presumably, the IOC should when it boots contact a list of (possibly
> redundant) servers who know about hierarchical names providing to each a
> complete list of the IOC's PV names. The protocol might have some requests
> like this.
> 
> O define an object name specifying its type
> O undefined an object name
> O define a type name, specifying the types of its members and or its
> interfaces
> O undefined a type
> 
> Presumably there are already some portable open source name resolution
> systems that provide this type of functionality.
> 
> No matter how it gets implemented, a feature addressing the type of things
> that David is needing to implement _should_ be on the list for addition to
> EPICS base.
It will be nice if this functionality become available. I hope it will
not take so long. It is also nice if a name server can query these
information to a list of IOCs, so that we can restart Name server anytime.

Another possibility I can imagine is the internal records in EPICS
database. We may be able to read these information through just plain
Channel Access (instead of new protocol and new applications).

Regards,

Noboru

> 
> Jeff
> 
>> -----Original Message-----
>> From: tech-talk-bounces@aps.anl.gov [mailto:tech-talk-bounces@aps.anl.gov]
>> On Behalf Of David Dudley
>> Sent: Tuesday, May 06, 2008 8:27 PM
>> To: tech-talk@aps.anl.gov
>> Subject: Listing channels
>>
>> Got 3 little questions:
>>
>> 1. Is there a method or application anywhere that can generate a list of
>> the channels on a remote IOC?  I mean, a program I can point at the
>> IOC's address and have it generate a list of all the channels on that
>> unit?
>>
>> 2. Does SDDS require X in order to compile?  It's a given that SDDSPlot
>> is probably going to need X, but most of the apps don't have GUI's, so
>> must X be available in order to compile them?  If not, how do you
>> generate the non-X programs?
>>
>> 3. Is there a program that will extract a portion of an SDDS file?  In
>> order to use SDDS for archiving (which it looks like it might be very
>> useful for), it's going to have to run forever on the IOC unit.  If I
>> need to generate a dataset from a SDDS datafile, how do I pull out just
>> the period (say... everything from yesterday, midnite to midnite) from a
>> file that has much, much more information in it (days, weeks, or months
>> ...)?  I can come up with stuff to cause it to restart, say once a week,
>> but how do I pull out a subset of information?
>>
>> David Dudley