A Tuesday 23 March 2010 14:17:29 Matt Calder escrigué:
> Maarten,
>
> Thanks for the pointer to h5diff. Unfortunately, it shows no
> difference in the files. Any idea how a timestamp might find its way
> into the file? Or where I might look for an answer? I'm guessing this
> is happening at the hdf5 rather than the pytable level.
This is my guess too. The script below generates identical files:
---------------------------------------
import tables
import numpy
import time
# Define simple table
table1 = numpy.array([[(0,0,0), (1,0,0)], [(0,1,0), (0,0,1)]], {'names':
('r','g','b'), 'formats': ('f4', 'f4', 'f4')})
# Write table to a file
h5file = tables.openFile("/tmp/file1.h5", "w", PYTABLES_SYS_ATTRS=False)
h5file.createTable("/", "table1", description = table1)
h5file.close()
#time.sleep(1)
# Write same table to another file
h5file = tables.openFile("/tmp/file2.h5", "w", PYTABLES_SYS_ATTRS=False)
h5file.createTable("/", "table1", description = table1)
h5file.close()
---------------
[notice how I've disabled pytables' system attributes, just in case]
$ diff /tmp/file1.h5 /tmp/file2.h5
$
but if I uncomment the `time.sleep(1)` line, the files differ:
$ diff /tmp/file1.h5 /tmp/file2.h5
Els fitxers /tmp/file1.h5 i /tmp/file2.h5 difereixen
$
Object IDs are also identical:
$ h5ls -i /tmp/file1.h5
HDF5 "/tmp/file1.h5" {
GROUP "/" {
OBJECTID { 33554433 }
DATASET "table1" {
DATATYPE H5T_COMPOUND {
H5T_IEEE_F32LE "r";
H5T_IEEE_F32LE "g";
H5T_IEEE_F32LE "b";
}
DATASPACE SIMPLE { ( 4 ) / ( H5S_UNLIMITED ) }
OBJECTID { 83886081 }
[...]
$ h5ls -i /tmp/file2.h5
HDF5 "/tmp/file2.h5" {
GROUP "/" {
OBJECTID { 33554433 }
DATASET "table1" {
DATATYPE H5T_COMPOUND {
H5T_IEEE_F32LE "r";
H5T_IEEE_F32LE "g";
H5T_IEEE_F32LE "b";
}
DATASPACE SIMPLE { ( 4 ) / ( H5S_UNLIMITED ) }
OBJECTID { 83886081 }
[...]
Mmh, I am afraid that you will need to use another way to check whether the
files are identical or not.
--
Francesc Alted
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