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What's new in PyTables 0.7.2
----------------------------
This is a mainly a maintenance release, where the next issues has
been addressed:
- Fixed a nasty memory leak located on the C libraries (It was
occurring during attribute writes). After that, the memory
consumption when using large object trees has dropped quite
a bit. However, there remains some small leaks that has been
tracked down to the underlying numarray library. These leaks
has been reported, and hopefully they should be fixed more
sooner than later.
- Table buffers are built dinamically now, so if Tables are
not accessed for reading or writing this memory will not be
booked. This will help to reduce the memory consumption.
- The opening of files with lots of nodes has been optimized
between a factor 2 and 3. For example, a file with 10 groups
and 3000 tables that takes 9.3 seconds to open in 0.7.1, now
takes only 2.8 seconds.
- The Table.read() method has been refactored and optimized
and some parts of its code has been moved to Pyrex. In
particular, in the special case of step=1, up to a factor 5
of speedup (reaching 160 MB/s on a Pentium4 @ 2 GHz) when
reading table contents can be achieved now.
Enjoy!,
-- Francesc Alted
falted@openlc.org
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