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Re: [Getfem-users] something is broken

From: Andriy Andreykiv
Subject: Re: [Getfem-users] something is broken
Date: Tue, 12 Mar 2019 09:29:08 +0100

Dear Konstantinos,

Unfortunately, I won't be able to share the code. But, in general terms, the differences we see come from our bricks that heavily use assembly with workspaces and non-linear terms.
Given that you were working on workspaces, do you think you could detect some different behaviour in one of the standard contact examples of Getfem? 

Best regards,

On Tue, 12 Mar 2019 at 07:00, Konstantinos Poulios <address@hidden> wrote:
Dear Andriy,

Is it possible to share some code for the test case or is it too specific to your own internal stuff? Just looking at the commitdiff again I wasn't able to identify any too obvious mistake.

Best regards

On Mon, Mar 11, 2019 at 4:46 PM Andriy Andreykiv <address@hidden> wrote:
Found the commit that causes failure of our tests:

SHA-1: 2f7396a46dadad266ba882623d300d1a19e274dc
* Code cleanup and stricter constness
from Konstantinos on 3/3/2019

Konstantinos, Yves, could you have a look at it?

On Mon, 11 Mar 2019 at 14:02, Andriy Andreykiv <address@hidden> wrote:
Dear Getfem project,

We started to get convergence problems in our tests after pulling from the latest master.
When pulling from Yves's commit made on 27/2/2019 with SHA-1: 4487cec1aa40728704bf4e4f18b342809944ee0d
and commit message "* two small fixes" everything seemed to work.
The type of a problem that we have is a simple cube compression with finite strain formulation (hence, no contact). With the above
mentioned commit it nicely converges within 8 steps and quadratic convergence, while with the latest master it barely manages to reduce the residual.

I suspect that something changed in the assembly. Several other branches got merged that day.
I tried to run it on 1 and several threads - no difference, hence it's not a thread race.
I will continue checking for the specific commit that fails

Best regards,

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