The OPAL Discussion Forum

[Achim Gsell <achim.gsell AT psi.ch>]

Hi,

I try to fix the ParallelPlateFurman1 test and get the following error:

ParallelTTracker {+0}> 14.20.41 Step      0 at    2.500 [mm] t=  2.000e-12 
[s] E=    0.003 [keV] 
[proc 0] E: H5WriteFileAttribString: Cannot create attribute 'OPAL_flavour' 
for '/'.
[proc 1] E: H5WriteFileAttribString: Cannot create attribute 'OPAL_flavour' 
for '/'.
[proc 2] E: H5WriteFileAttribString: Cannot create attribute 'OPAL_flavour' 
for '/'.
[proc 3] E: H5WriteFileAttribString: Cannot create attribute 'OPAL_flavour' 
for '/'.

The problem is that the attribute 'OPAL_flavour' is already set and H5hut 
doesn't allow to overwrite the value. This is one of the ancient decisions 
former H5Part developers made. Unfortunately there is no API call get query 
the existence of an attribute. To solve the problem we can

1) implement a H5hut function H5GetFileAttribExists() and adopt the OPAL code 
accordingly

2) or change the H5WriteXxxAtribXxx() calls. 

I prefer the second. Usually data in a file opened for writing can be 
overwritten. In append mode data can only be appended but not be overwritten. 
Applied to H5hut means, it is possible to add new time-steps, add new 
attributes, add new datasets/field-data to steps etc. but you cannot 
overwrite an existing attribute, dataset etc.

Comments, suggestions?

Achim