Experimental Physics and
Industrial Control System

Rod Nussbaumer <[email protected]> · Thu, 28 Jul 2016 10:20:26 -0700

If this is using Linux-GPIB as the underlying asyn port driver, then

there is apparently a long standing bug that causes waveform records to

transfer very slowly with streamDevice. My workaround for this was to

use a waveform record with asynOctetCmdResponse DTYP (thanks to either

Eric or Mark for suggesting that) for that one operation. I post-process

the octet data using a subroutine record and it works fine. The OP's

problem seems to be a bit more complicated, as the array needs to be

sent, rather than received, but if the cause of the problem is a match,

at least the solution may be closer at hand.

Rod Nussbaumer,
TRIUMF,
Vancouver, Canada

On 07/25/2016 04:45 AM, Mark Rivers wrote:

Why is StreamDevice slow to transfer the data?  I don't think that should be the case, StreamDevice should be able to go as fast as any other software.  I think the simplest solution would be to figure out why StreamDevice is slow for you.

Mark

________________________________
From: [email protected] [[email protected]] on behalf of Silver [[email protected]]
Sent: Monday, July 25, 2016 6:34 AM
To: tech-talk
Subject: may I start a pcaspy ioc together with a streamdevice ioc?

hi, all

   I have a normal streamdevice ioc which controls power supply via ethernet. Now I want to add a function to send large waveform data (about 10000 floats) to power supply. If I just use streamdevice to transfer the data, the speed is slow and can't satisfy my requriement.
   I with to use pcaspy to creat another ioc as it can supply a pv to a client, for example, which inform to send data by a pv write, then the pcaspy ioc will send the data to power supply by ethernet. so I have two questions:
1. how to use the same socket of streamdevice? power supply controller has only one socket server. (during data transfer, I can stop the streamdevice db processing)
2. how to hook up the pcaspy ioc together with streamdevice ioc? (if I don't want to use procServ or inet, etc.)
   thanks a lot for your help.

________________________________
Best wishes
Geyang 2016-07-25

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System