ffc team mailing list archive

[Anders Logg <logg@xxxxxxxxx>]

On Wed, Aug 31, 2011 at 12:07:42PM -0700, Johan Hake wrote:
> A recent commit to instant fixes this problem.
>  
> The reason this has been a problem before is that the filelocking system used
> by instant does not work for NFS. Which many of use when submitting jobs to a
> cluster.
>  
> I found a NFS safe file locking library online, fcntl:
>  
> https://launchpad.net/flufl.lock
>  
> which is now supported by instant. If not present it defaults to the old one.
> My understandment of file locking is still limited, but it worked for some test
> cases I have using PyDOLFIN, which broke misserably with the old file locking
> module.
>  
> Please install it and test this new feature.
>  
> The time where a simulation need to be run on the frontend first to generate
> the compiled code might be over :).

Nice! I just did exactly that today before submitting a job (run on
frontend to get all the forms in place).

Which package contains flufl, and is it installed on bigblue?

--
Anders


> Johan
>  
> On Wednesday August 3 2011 20:49:24 Johan Hake wrote:
> > Hello!
> >
> > Why do we write generated code to file when the jit compilation is used?
> > This introduce a cause of error which has annoyed me for some time now.
> > Instead of writing the code to file and then in ufc.build we just read the
> > file again, we could just pass the code as a single str.
> >
> > This would save us for a lot of hassle with file access during server run.
> > When several runs are commited and executed at one time I experience a lot
> > of runs that stops prematurely because of file access problem. This
> > "should" have been fixed by some file locking mechanism which
> really is
> > not working.
> >
> > If you think this is a cool thing to do I can do the work. We just have to
> > add a parameter, or an extra argument to some ffc functions and change the
> > interface to ufc.build.
> >
> > Johan
> >
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>  

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