Experimental Physics and
Industrial Control System

"Pearson, Matthew R." <[email protected]> · Tue, 8 Nov 2016 17:18:11 +0000

Hi,

I’ve just tried and I get the same results.

I suspect it’s because this is being called more than once, for every instance, in the plugin constructor:

m_server = startPVAServer(PVACCESS_ALL_PROVIDERS, 0, true, true);

The V4 developers could confirm this, but I seem to recall this should only be called once per process. Although, I can't find reference to that in the V4 documentation.

Cheers,
Matt

Data Acquisition and Control Engineer
Spallation Neutron Source
Oak Ridge National Lab

> On Nov 8, 2016, at 10:38 AM, Alexander Söderqvist <[email protected]> wrote:
> 
> Hi all,
> 
> I am at ESS running an IOC with 2 pva plugins both connected to the simDetector:
> 
> # Create a simDetector driver
> # simDetectorConfig(const char *portName, int maxSizeX, int maxSizeY, int dataType,
> #                   int maxBuffers, int maxMemory, int priority, int stackSize)
> simDetectorConfig("DMSCSIMDET", 500, 500, 1, 0, 0)
> dbLoadRecords("simDetector.template", "P=DMSC:, R=CAM-, PORT=DMSCSIMDET, ADDR=0, TIMEOUT=1")
> #create pva plugin
> NDPvaConfigure(DMSCPVA, 20, 0, "DMSCSIMDET", 0, "DMSC:IMAGE", 0)
> VERSION : pvAccess Server v4.1.2
> PROVIDER_NAMES : local
> BEACON_ADDR_LIST : 
> AUTO_BEACON_ADDR_LIST : 1
> BEACON_PERIOD : 15
> BROADCAST_PORT : 5076
> SERVER_PORT : 5075
> RCV_BUFFER_SIZE : 16384
> IGNORE_ADDR_LIST: 
> STATE : INITIALIZED
> dbLoadRecords("NDPva.template", "P=DMSC:, R=PVA-, PORT=DMSCPVA, ADDR=0, TIMEOUT=1, NDARRAY_PORT=DMSCSIMDET")
> #create pva plugin
> NDPvaConfigure(DMSCPVA2, 20, 0, "DMSCSIMDET", 0, "DMSC:IMAGE2", 0)
> 2016-11-08T16:33:54.789 Using dynamically assigned TCP port 52363.
> VERSION : pvAccess Server v4.1.2
> PROVIDER_NAMES : local
> BEACON_ADDR_LIST : 
> AUTO_BEACON_ADDR_LIST : 1
> BEACON_PERIOD : 15
> BROADCAST_PORT : 5076
> SERVER_PORT : 52363
> RCV_BUFFER_SIZE : 16384
> IGNORE_ADDR_LIST: 
> STATE : INITIALIZED
> dbLoadRecords("NDPva.template", "P=DMSC:, R=PVA2-, PORT=DMSCPVA2, ADDR=0, TIMEOUT=1, NDARRAY_PORT=DMSCSIMDET")
> 
> As you can see it start 2 pvAccess servers.
> 
> Monitoring one array sees multiple instance of the pv:
> pvget -m DMSC:IMAGE2
> [ChannelRequesterImpl] message(More than one channel with name 'DMSC:IMAGE2' detected, connected to: 194.47.240.7:52834, ignored: 194.47.240.7:5075, warning)
> DMSC:IMAGE2
> structure 
>     union value
>         (none)
> 
> Listing the servers shows the 2 pvAccess servers (Which yo):
> pvlist
> GUID 0x7EE8215800000000799BA728, version 1: tcp@[x.x.x.x:5075]
> GUID 0x7EE82158000000008AD62829, version 1: tcp@[x.x.x.x:52834]
> 
> Listing pvs on each server shows that both are publishing the same PVs.
> pvlist 0x7EE8215800000000799BA728
> DMSC:IMAGE
> DMSC:IMAGE2
> 
> pvlist 0x7EE82158000000008AD62829
> DMSC:IMAGE
> DMSC:IMAGE2
> 
> Has anyone tried running 2 NDPluginPvas in the same IOC before? Are you supposed to start multiple pvAccess servers in the same IOC?
> 
> Note that we are using our own build system, and it might be an issue there.
> 
> Regards,
> Alexander Söderqvist

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System