[Users] output not overwritten anymore?

[Ian Hinder]

On 12 Mar 2012, at 22:06, Christian Reisswig wrote:

> Hi Ian, Erik,
> 
> thanks for the reply! I played around with IO::truncate_files = yes/no
> but without success.
> In particular, CarpetIOScalar does not overwrite files (I am looking at the L2 
> norm of some grid function) anymore.

What machine/OS/filesystem are you using?  Could it be that in some new version of Linux the file semantics have changed?

> 
> cheers,
> Christian
> 
>> On 12 Mar 2012, at 20:25, Christian Reisswig wrote:
>>> Hi,
>>> 
>>> I am wondering if the default behavior of Cactus output has been changed
>>> recently. When starting a simulation from scratch (i.e. no recovery),
>>> already existing output files used to get overwritten.
>>> Instead now, Cactus appends data to the end of the files. How can I
>>> change this behavior? Is there a parameter for this?
>> 
>> Hi Christian,
>> 
>>> From IOUtil/param.ccl:
>> BOOLEAN truncate_files "Truncate existing output files from previous runs
>> (except when recovering) ?" STEERABLE = ALWAYS {
>> } "yes"
>> 
>> I don't think this has been changed.  If it is not truncating the files,
>> then either you have this parameter set accidentally, or there is
>> something very wrong!
>> 
>> On the other hand, many people who might have been involved in such a
>> change are probably using simfactory, which ensures that you have a new
>> empty directory for each Cactus run, so a problem might not have been
>> noticed.

-- 
Ian Hinder
http://numrel.aei.mpg.de/people/hinder