Experimental Physics and
Industrial Control System

Hi:

I'm using EPICS base 7.0.1.1 with either the result of

makeBaseApp.pl -t example example;  makeBaseApp.pl -i -t example example

or with the neutrons demo from

git clone https://github.com/kasemir/EPICSV4Sandbox.git
cd EPICSV4Sandbox/neutronsDemoServer
make
bin/$EPICS_HOST_ARCH/neutronServerMain


Using `pvget` always works fine, printing one value and then quitting.

But `pvget -m` will sometimes only show one value, and then print "Timeout" and quit:

pvget –m training:ai1
training:ai1                   4
Timeout

pvget –m -r 'field(time_of_flight, pixel)' neutrons
neutrons
structure 
    epics:nt/NTScalarArray:1.0 time_of_flight
        uint[] value [11561,11561,11561,11561,11561,11561,11561,11561,11561,11561]
    epics:nt/NTScalarArray:1.0 pixel
        uint[] value [115610,115610,115610,115610,115610,115610,115610,115610,115610,115610]
Timeout


It seems to take about 3 seconds, and indeed using the `-w` options allows to extend the time:

$ pvget -w 60 –m -r 'field(time_of_flight, pixel)' neutrons
neutrons
structure 
    epics:nt/NTScalarArray:1.0 time_of_flight
        uint[] value [52612,52612,52612,52612,52612,52612,52612,52612,52612,52612]
    epics:nt/NTScalarArray:1.0 pixel
        uint[] value [526120,526120,526120,526120,526120,526120,526120,526120,526120,526120]
<.. 60 seconds ..>
Timeout


The only clue:
This is in a Linux VM.
All's fine when directly in the VM, i.e. in VirtualBox.
But when I ssh into the VM from the host, I get these timeouts about half the time.

Note I'm not talking about pvget from the host to an IOC in the VM.
The IOC, custom PVA server and pvget are all inside the VM.
EPICS_PVA_ADDR_LIST=10.0.2.15
EPICS_PVA_AUTO_ADDR_LIST=NO 

At times where ssh-into-the-VM and then 'pvget -m' time out,
the same 'pvget -m' works fine in a terminal within the VM.

I understand that the UDP connection could be iffy,
but once it connects and gets the first value via TCP, why then timeout?
-Kay

Replies:

Re: pvget -m timeout after first value Michael Davidsaver

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