[CPMD-list] Upon compilation of cpmd2cube...

[kohsj at ihpc.a-star.edu.sg]

Dear Dr. Axel,

Is there any way that one can remove the .nfsXXXXX files, and subsequently, the "cpmd2cube-v0.1.1" folder?

Thanks again!



AK> My IT man suggested that it could probably be:
 AK> 
 AK> 
 AK> "Since you are the one who create the folder, you shall have the 
 right to
 AK> remove anything in the folder. However, you claim that you 
 delete the
 AK> file and it come back again. This is mostly likely due to your 
 program.AK> You may have write a program and this program may need 
 to write
 AK> something in this folder everytime it is running and therefore 
 the file
 AK> come back after you delete it. I just make a guess and I do not 
 have any
 AK> evidence to support my point. Hope that clear your doubt."
 
 well, this is close to the explanation. the reason for the .nfsXXXXX 
 filesis 'feature' of NFS in order to emulate posix style file access 
 semantics.to explain: if you delete a file on a posix/unix machine, 
 the file is
 initially only removed from the directory listing but not deleted if 
 thereis still a process, that has an open file descriptor pointing 
 to that
 file. only if the last process accessing the file has ended, that 
 file is
 really deleted. this is btw a very convenient way of creating 
 'invisible'scratch files, that get automatically deleted, when the 
 process terminates
 or dies (you open(2)/fopen(3) a file with a unique name for writing 
 and 
 immediately unlink(2) it). back to the .nfsXXXX file: the NFS 
 filesystem,however is basically 'stateless', i.e. the connection to 
 the NFS server 
 can be interrupted any time and later reconnected (in some cases it 
 can 
 even survive an intermediate reboot with replacing the hardware and 
 resizing the filesystem). so to implement the 'file-stays-even-if-
 deleted'semantics, the nfs server daemon acts as a proxy for the 
 processes 
 accessing the file, but to make this work even in case of a reboot, the
 .nfsXXXX files are created. the XXXXX is an hash, that allows the 
 serverto detect the process needing to access the 'file with no name'.
 most frequently this happens if you open a file in an editor, that
 keeps an open file descriptor to the file it opens (or to the 
 associated backup/undo file).
 
 
 
 axel.
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