The OPAL Discussion Forum

[christof kraus <christof.j.kraus AT gmail.com>]

Just wanted to propose the same as Andreas. Hopefully one day in the
future we can simulate a transfer line followed by a cyclotron. Then a
global attribute does not make sense.

christof

On Fri, Apr 27, 2012 at 3:16 PM, Achim Gsell <achim.gsell AT psi.ch> wrote:
> 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
>
>
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