Experimental Physics and
Industrial Control System

"S. Joshua Stein" <[email protected]> · Wed, 14 Aug 2002 10:35:56 -0500

Jeff,

  As you suspected, my problem was on the client side - the SDDS tool uses the 
ezca library, and my LD_LIBRARY_PATH did not include the new (3.14 compliant)
ezca libs. When I prepended the new path, things began working.

Thanks!
<Josh>

Jeff Hill wrote:
> 
> 1) I suspect that, possibly due to some subtlety in your Solaris path
> environment variable or your make file, your SDDS tool isn't built
> against EPICS R3.14.beta2 as expected. The string stored in the client
> library corresponding to the error code returned by the server -
> ECA_TOLARGE - has changed between R3.13 and R3.14, and I see the message
> from EPICS R3.13 in the output that you posted.
> 
> 2) The context string arriving from the server indicates that it is
> running EPICS R3.14 and that EPICS_CA_MAX_ARRAY_BYTES is set there as
> you indicated in your message.
> 
> 3) It looks like this large array request is being rejected in the
> server because the server knows the protocol revision of the client, and
> therefore rejects the request because the RF3.13 client will not have a
> message buffer large enough to receive it. If you had requested more
> that 65535 element then the R3.13 client would have detected a request
> exceeding the bounds of the current protocol, and rejected it.
> 
> The "which" and "whereis" commands can be useful when resolving path
> issues on UNIX. Otherwise, if there are make file issues then Janet
> should be able to help you out, and she is just down the hall there at
> APS.
> 
> I will see if the message can be improved to more clearly identify that
> the problem is in the client when this particular situation occurs.
> 
> Jeff
> 
> > -----Original Message-----
> > From: S. Joshua Stein [mailto:[email protected]]
> > Sent: Wednesday, August 14, 2002 7:00 AM
> > To: [email protected]
> > Subject: Large arrays over CA - attempt #2
> >
> > Well, let me try this from a sane mail program - sorry for the repeat:
> >
> > I am attempting to process a waveform record of 32000 elements (type
> > USHORT) and
> > pass that data over channel access (R3.14beta2). I have set the
> > environment
> > variable EPICS_CA_MAX_ARRAY_BYTES to 512000 on both the (Solaris) IOC
> > and a
> > client Xterm.
> >
> > When I attempt to run an SDDS tool (built against R3.14b2) to read
> that
> > waveform, I get the following error message:
> >
> > CA.Client.Diagnostic..............................................
> > Message: "The array or data structure specified will not fit in CA
> > message
> > buffer"
> > Severity: "Warning" Context: "detected by: eos:5064 for: server unable
> > to load
> > read (or
> > subscription update) response into protocol buffer
> PV="SJS:chan1WaveWF"
> > max
> > bytes=512024 -
> > with request chan=SJS:chan1WaveWF op=0 data type=DBR_CTRL_LONG
> > count=32000"
> >
> > The environment variables on my ioc are as follows:
> > epics> epicsPrtEnvParams
> > EPICS_AR_PORT: 7002
> > EPICS_CAS_BEACON_ADDR_LIST is undefined
> > EPICS_CAS_INTF_ADDR_LIST is undefined
> > EPICS_CAS_SERVER_PORT is undefined
> > EPICS_CA_ADDR_LIST: 164.54.189.255
> > EPICS_CA_AUTO_ADDR_LIST: YES
> > EPICS_CA_BEACON_PERIOD: 15.0
> > EPICS_CA_CONN_TMO: 30.0
> > EPICS_CA_MAX_ARRAY_BYTES: 512000
> > EPICS_CA_REPEATER_PORT: 5065
> > EPICS_CA_SERVER_PORT: 5064
> > EPICS_CMD_PROTO_PORT is undefined
> > EPICS_IOC_LOG_FILE_COMMAND is undefined
> > EPICS_IOC_LOG_FILE_LIMIT: 1000000
> > EPICS_IOC_LOG_FILE_NAME is undefined
> > EPICS_IOC_LOG_INET is undefined
> > EPICS_IOC_LOG_PORT: 7004
> > EPICS_TIMEZONE: CUS::360:033102:102802
> > EPICS_TS_NTP_INET is undefined
> >
> >
> > Any ideas?
> >
> >
> > --
> > +-----------------------------------------+
> > | S. Joshua Stein                         |
> > |                                         |
> > | Electronics Engineer                    |
> > | Accelerator Systems Division            |
> > | Advanced Photon Source                  |
> > | Argonne National Laboratory             |
> > | www.aps.anl.gov/asd/people/stein/htdocs |
> > +-----------------------------------------+

-- 
+-----------------------------------------+
| S. Joshua Stein                         |
|                                         |
| Electronics Engineer                    |
| Accelerator Systems Division            |
| Advanced Photon Source                  |
| Argonne National Laboratory             | 
| www.aps.anl.gov/asd/people/stein/htdocs |
+-----------------------------------------+

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System