instant team mailing list archive

["Martin Sandve Alnæs" <martinal@xxxxxxxxx>]

2008/9/6 Anders Logg <logg@xxxxxxxxx>:
> On Fri, Sep 05, 2008 at 10:50:37AM +0200, Martin Sandve Alnæs wrote:
>> I've added a test that times the cache mechanism, using
>> a signature object that sleeps for a second in sig.signature()
>> and half a second in sig.__hash__().
>> It's called test18.py. Seems to me that the cache works fine.
>
> I can't get it to work, but maybe I'm using it wrong.
>
> I'm running the bench/fem/jit/ test script in DOLFIN with the current
> version of FFC (just pushed) and I always get the following:
>
> --- Calling FFC JIT compiler ---
> 1. Module returned by import_module:  None
> 2. Calling FFC just-in-time (JIT) compiler, this may take some time... done
> 3. Creating Python extension (compiling and linking), this may take some time... done
> Assembling matrix over cells (finished).
>
> In step (1), Instant always returns None when calling import_module().
> I assume this means that the module was not found, neither in the
> in-memory cache nor disk cache.
>
> Since it returns None, FFC generates code in step (2). This takes a
> second or two.
>
> Then in step (3), FFC sends the generated code to build_module(). This
> goes surprisingly fast, so it seem Instant must return something from
> cache.
>
> So, something strange is going on, both in step (1) and (3). Here's
> the code for FFC's jit() which is now very short:
>
>    # Check options
>    options = check_options(input_form, options)
>
>    # Wrap input
>    jit_object = wrap(input_form, options)
>
>    # Check cache
>    module = instant.import_module(jit_object)
>    print "Module returned by import_module: ", module
>
>    # Compile form
>    debug("Calling FFC just-in-time (JIT) compiler, this may take some  time...", -1)
>    signature = jit_object.signature()
>    compile(input_form, signature, options)
>    debug("done", -1)
>
>    # Wrap code into a Python module using Instant
>    debug("Creating Python extension (compiling and linking), this may take some time...", -1)
>    filename = signature + ".h"
>    (cppargs, path, ufc_include) = extract_instant_flags(options)
>    module = instant.build_module(wrap_headers=[filename],
>                                  additional_declarations=ufc_include,
>                                  include_dirs=path,
>                                  cppargs=cppargs,
>                                  signature=signature)
>    debug("done", -1)
>
>    # Extract form
>    exec("compiled_form = module.%s()" % signature)
>
> Can you spot something wrong?
>
> --
> Anders

No... I'll try to run it.

Btw:

>    # Extract form
>    exec("compiled_form = module.%s()" % signature)

This is clearer:

    compiled_form = getattr(module, signature)()


--
Martin