Experimental Physics and
Industrial Control System

"Jeff Hill" <[email protected]> · Wed, 14 Aug 2002 09:21:24 -0600

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 |
> +-----------------------------------------+

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System