Francesc Alted wrote:
> At least each open node keeps a reference to the File object. So, in
> order to remove the File object you must close the nodes that reference
> to them. See the File.close() for an example on how to do this. I
> don't know if I have addressed your issue, but if not, please tell me.
Well, let me start with a simple problem. If I open up a file, and then
don't explicitly close it, when I quit Python I get a "Closing remaining
open files:" and then a list of all the files. Part of the problem is
these refcounts. If the only reference was the file object, I could be
at least be assured that the file objects used in a more constrained
scope (inside classes or functions) would be garbage collected, but
that's definitely not the case.
>>> import tables, sys, gc
>>> gc.set_debug(gc.DEBUG_LEAK)
>>> gc.collect()
0
>>> fyle1 = tables.openFile("Foo.h5")
>>> sys.getrefcount(fyle1)
6
>>> del fyle1
>>> gc.collect()
0
>>> exit()
Closing remaining open files: Foo.h5... done
(I've changed the name of the file to the much smaller "Foo.h5" rather
than the full path.)
Something is keeping that file object open, and I don't understand what.
It's obviously not just a reference cycle, because it's not showing up
in the garbage.
It's not simply each node, as this file has 252 nodes. Printing fyle1
gives me a list of the nodes, and a new reference count of 511.
Printing a file with 519 nodes, results in it have 508 references. Is
the difference due to caching?
So what nodes are holding the extra four references to the file?
--
Anthony Foglia
Princeton Consultants
(609) 987-8787 x233
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