dolfin team mailing list archive

[Johan Hake <johan.hake@xxxxxxxxx>]

On Wednesday August 31 2011 12:14:55 Anders Logg wrote:
> 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?

Probably not. It is back to manual install I guess. Do not think it is 
provided by Debian yet. 

Also it should not be confused with:

  python-flufl.enum - Yet another Python enumeration package.

Johan

> --
> 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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