[Pytables-users] Re: Bug? flush() ignores new tables

[Francesc A. <fa...@py...>]

Hi Nobbi,

A Dimecres 29 Setembre 2004 11:57, vareu escriure:
> Hi there,
> 
> just starting to use pytables. I was rather surprised by the fact that flush() 
> does not write new tables to disk. Instead, I have to close() the file and 
> then reopen it again.

Yes, this is is a known bug. This is solved in CVS version, and some people
has made a patch for 0.8, and I guess it will apply well to 0.8.1 as well
(see patch #947006 at the pytables project:
http://sourceforge.net/tracker/?group_id=63486&atid=504146)

> Maybe there is another way to go? My intention is to have one script that 
> opens an existing hdf5 datafile or creates it from scratch if it does not 
> exist and then starts a lengthy calculation saving the current state every 
> few minutes. Usually, the script would never finish but run indefinitely 
> until interrupted by Ctrl-C (therefore close() is never called)
> 
> Another script would run interactively in parallel (maybe even on another 
> machine) reading the current state from disk and evaluating the data.

I do think so. At least there should be someone in the pytables users list
that are using pytables for doing similar things.

> Is this setup possible with pytables at all? I read somewhere that HDF5 
> supports parallel file access in some way. Does PyTables allow this as well?

No, pytables does not support parallel file access as of now.

Cheers,

-- 
Francesc Alted