Re: may I start a pcaspy ioc together with a streamdevice ioc?

[Rod Nussbaumer <bomr@triumf.ca>]

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: tech-talk-bounces@aps.anl.gov [tech-talk-bounces@aps.anl.gov] on behalf of Silver [marco_hair@163.com]
> 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.
>
>
>
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>
> ________________________________
> Best wishes
> Geyang 2016-07-25