Experimental Physics and
Industrial Control System

"Mark Rivers" <[email protected]> · Thu, 9 Sep 2010 22:31:05 -0500

I am not sure how CA allocates memory, but you have set a REALLY big value for EPICS_CA_MAX_ARRAY_BYTES (1.6GB).  Perhaps you should try setting it to be just a little bigger than the largest image you will use.  Is your data 8-bit?  If so then 400000 is big enough for the 640x480 array you mentioned.

Mark

________________________________

From: [email protected] on behalf of wantianmin
Sent: Thu 9/9/2010 10:26 PM
To: [email protected]
Subject: Fwd: Re: ca client get waveform pv error

 You have to set EPICS_CA_MAX_ARRAY_BYTES on both the server (IOC) and 
client ends. On Sep 9, 2010, at 7:17 PM, wantianmin wrote:
>> Hi all,
>> I am use a edm client get a waveform pv(640*480 ),the IOC has enough
>> memory,but only one client can get the pv data,when another client try
>> to connect to this pv,the client get the error message:
>> CA value callback('pic1'): No data, CA status The requested data
>> transfer is greater than available memory or EPICS_CA_MAX_ARRAY_BYTES
>>
>> But ,I set the EPICS_CA_MAX_ARRAY_BYTES to a big number(1600000000),is
>> there some other options need to be configured?
>> Thanks for your help.
>> wantianmin
>>
Hi,Eric,
   thanks for your reply,
   I checked the shell command for running the IOC and the client,
   The EPICS_CA_MAX_ARRAY_BYTES is both set to 1600000000,and
   running one client is ok,but if I try to running 2 client at the 
seem time,
  the second client will complain  about such error(CA value callback ...)
                                                                                               wantianmin

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System