06-24-2010
Hi, Giogio.
Glad to hear it pointed you in the right direction.
There is always a balance between desired speed and risk. I think Niklaus Wirth recommended bounds checking on arrays
particularly for a production code. The idea is that one's results are worthless, even dangerous, if they are produced quickly but incorrectly.
At a place I once worked specializing in big iron:
Big iron - Wikipedia, the free encyclopedia , we often said that if you don't care about the reliability of the answers, we can make the computation arbitrarily fast
In any event, -fbounds-check is a useful debugging feature.
Best wishes ... cheers, drl
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LEARN ABOUT DEBIAN
ptrepack
PTREPACK(1) General Commands Manual PTREPACK(1)
NAME
ptrepack - Copy any PyTables Leaf, Group or complete subtree into another file.
SYNOPSIS
ptrepack -h -v -o -R start,stop,step --non-recursive --dest-title=title --dont-copyuser-attrs --overwrite-nodes --complevel=(0-9) --com-
plib=lib --shuffle=(0|1) --fletcher32=(0|1) --keep-source-filters --upgrade-flavors --dont-regenerate-old-indexes sourcefile:sourcegroup
destfile:destgroup
DESCRIPTION
Copy any Leaf, Group or complete subtree from a PyTables file into another file.
OPTIONS
A summary of options is included below.
-h Prints a help text.
-v Show more information.
-o Overwite destination file.
-R RANGE
Select a RANGE of rows in the form start,stop,step during the copy of all the leaves.
--non-recursive
Do not do a recursive copy. Default is to do it.
--dest-title=title
Title for the new file (if not specified, the source is copied).
--dont-copy-userattrs
Do not copy the user attrs (default is to do it).
--overwrite-nodes
Overwrite destination nodes if they exist. Default is not to overwrite them.
--complevel=(0-9)
Set a compression level (0 for no compression, which is the default).
--complib=lib
Set the compression library to be used during the copy. lib can be set to "zlib", "lzo", "ucl" or "bzip2". Defaults to "zlib".
--shuffle=(0|1)
Activate or not the shuffling filter (default is active if complevel>0).
--fletcher32=(0|1)
Whether to activate or not the fletcher32 filter (not active by default).
--keep-source-filters
Use the original filters in source files. The default is not doing that if any of --complevel, --complib, --shuffle or --fletcher32
option is specified.
--upgrade-flavors
When repacking PyTables 1.x files, the flavor of leaves will be unset. With this, such a leaves will be serialized as objects with
the internal flavor ("numpy" for 2.x series).
--dont-regenerate-old-indexes
Disable regenerating old indexes. The default is to regenerate old indexes as they are found.
SEE ALSO
ptdump(1).
These utilities are documented fully by PyTables user's manual.
AUTHOR
This manual page was written by Francesc Altet <faltet@carabos.com>.
July 7, 2007 PTREPACK(1)