Experimental Physics and
Industrial Control System

"Guyotte, Greg S." <[email protected]> · Tue, 30 Aug 2016 14:43:21 +0000

I’m experiencing unexpected timeout behavior on PyEpics 3.2.4.

Using epics.PV, I experience double the expected timeout in all cases.
Using epics.caget(), the timeout value seems to be ignored and I
experience 5 seconds of delay when I ask for less than 5 seconds.  With
epics.caget(), if I ask for more than 5 seconds of timeout, it works as
expected.

Here is a simple Python test case to reproduce:

  import epics, time

  waittime = 2
  print "PyEpics %s test with timeout of %d seconds" %
(epics.__version__,waittime)

  print "Test 1: using epics.PV"
  time1 = time.time()
  p = epics.PV("idontexist", connection_timeout=waittime)
  time2 = time.time()
  print "  Time to create non-existent PV= ",time2-time1
  val = p.get(timeout=waittime, use_monitor=False)
  time3 = time.time()
  print "  Time to get non-existent PV= ",time3-time2

  print "" 

  print "Test 2: using epics.caget"
  time1 = time.time()
  val = epics.caget("idontexist", timeout=waittime, use_monitor=False)
  time2 = time.time()
  print "  Time to caget non-existent PV= ", time2-time1

Experimental Physics and Industrial Control System

Experimental Physics and
Industrial Control System