I am getting warning messages when using periodic boundary conditions

On Wed, Nov 30, 2011 at 01:55:57PM -0000, Sergey Alyaev wrote:
> New question #180500 on DOLFIN:
> https://answers.launchpad.net/dolfin/+question/180500
>
> I am using periodic boundary conditions and I am getting the following warning message:
>
> *** Warning: GenericVector::get is redirected to GenericVector::get_local. Use GenericVector::gather for get off-process entries. GenericVector::get will be removed.
>
> The GenericVector::get is never called explicitly in my code so it should come from overload of methods in Subdomains class.
>
> Does it still work correctly?
> Is there any other way to create periodic boundary condition which is going to be supported?

This is because get_local is used internally in the implementation of
periodic boundary conditions in DOLFIN (so nothing you can change in
your code). PeriodicBC is up for redesign in the future, in particular
to get it to work in parallel

--
Anders

How to suppress the warning messages from being printed to screen everytime ?

praveen

On Sat, Jan 21, 2012 at 06:45:43AM -0000, Praveen C wrote:
> Question #180500 on DOLFIN changed:
> https://answers.launchpad.net/dolfin/+question/180500
>
> Praveen C posted a new comment:
> How to suppress the warning messages from being printed to screen
> everytime ?

You can increase the log level. Try something like

set_log_level(ERROR)

--
Anders

As a hack to eliminate the warning messages about GenericVector::get while still displaying other (useful) information generated by FEniCS I wrote the following script, "filter.py":

# This script filters out the warnings about GenericVector::get.
# Written by Glen Granzow on November 15, 2012.

while True:
    try:
        line = raw_input()
    except EOFError:
        break
    if line.lstrip()[0:31] != "*** Warning: GenericVector::get":
        print line

Piping the output from my python program that uses FEniCS into this script displays all of the output except the warnings about GenericVector::get. I also wrote an example script, "testfilter.py", to test "filter.py":

from sys import stdout

for i in range(10):
    print i
    print " *** Warning: GenericVector::get is directed to"
print 'Press ENTER'
stdout.flush()
raw_input('Thank you')

Running

python testfilter.py | python filter.py

eliminates the warning lines seen when running just

python testfilter.py