Error in independent mode

[Rob Ross]

Hi Roger,

You've caught me on vacation and RobL at a conference; sorry for the 
delay.

What MPI are you using?

In theory this should work just fine.  It's not an issue of correctness 
given your algorithm (see other message).  Sounds like one of your 
processes didn't have access to the file system or something?  Are you 
running all the processes on one machine?  Could you try that and see if 
it works?

Thanks,

Rob

On Sat, 27 Mar 2004, Roger Ting wrote:

> Hi,
>     I get this error when i update a netcdf file in independent mode.
> 
>     2: MPI_File_write error = Input/output error
>      Unknow error occurs in writting file
> 
> Anyone have any idea what is going on ? This happens when i scale up to 5 processors.  
>       This sounds silly but what happen is i use a root processor to
> keep track of which position in the netcdf to append the new entry.
> Whenever a processor wants to add an enrty to the file, it sends a
> message to the root processor. The root will return the latest position.  
> If there are five entries in the file, the root processor will return 5.
> Therefore, the slave processor will write the enrty at position six. The
> slave is blocked before it get the message from the root processor.
> Therefore, i don't see how does the I/O error happens. Each processor
> should be guarantee to write to different position in the file.
> 
> Thx
> 
>