The ABINIT Users Mailing List ( CLOSED )

["Chun Li " <chun.li@mf.mpg.de>]

Dear Eric Roman,

Thanks a lot for your reply with detailed explanations. I have tried
abinit 4.2, and it really works fine. 

By the way, I also have ever encountered the same problem you mentioned
when trying it on a PC cluster using the LAM MPI libraries.

Frankly, I also need some new features in abinit 4.3, such as
calculating the piezoelectric tensor and applying finite electric field.
I wonder if it is necessary to use abinit 4.3 or 4.4 to get these
functions. I also wonder if this problem will remain in the future
versions of abinit.

In addition, I think it should be a bug in abinit, hope the developers
will consider it in the future versions. Thanks again.

Best regards.

Chun Li

-----Original Message-----
From: Eric Roman [mailto:ESRoman@berkeley.edu] 
Sent: Wednesday, September 29, 2004 9:31 PM
To: forum@abinit.org
Subject: Re: [abinit-forum] buffer size error


1.
I've seen the exact same problem with abinit 4.3 on our IBM SP.  I
posted a
note a few months ago about this, received some sympathy from other SP
users,
but never got a resolution from the abinit team.
 
I don't think 4.3 (parallel) was ever successfully tested on an SP.

The problem is that abinit is trying to receive a message into a receive
buffer, but tells MPI that the length of the receive buffer is zero.

Though this is not a problem for a zero-byte send, the matching message
in
my case is between 100-200 bytes.  (seen by wrapping the mpi_recv).

I think the parallel version running on one processor works in both
cases.
I'll have to check my notes for sure.

2.
abinit 4.2 (parallel) works fine on the IBM SP.  Same makefile_macros.
No sign of this problem.

(Didn't try 4.2 w/ LAM).

3.
I can reproduce it on a PC cluster using the LAM MPI libraries.  (I see
it in
MPI_Recv).

Here's the LAM error corresponding to the MPI_Recv case:

%tail alp.log
========================================================================
========

 ----iterations are completed or convergence reached----

 outwf  : write wavefunction to file alpo_DS11_WFK
-P-0000  leave_test : synchronization done...
MPI_Recv: message truncated (rank 0, MPI_COMM_WORLD)
Rank (0, MPI_COMM_WORLD): Call stack within LAM:
Rank (0, MPI_COMM_WORLD):  - MPI_Recv()
Rank (0, MPI_COMM_WORLD):  - main()

Saw this in outwf.f.  It was near the send at line 362 in abinit v4.3.2.
I _think_ I got this message any time I had prtwfk set to 1.

4.
My suggestion is to try version 4.2.  (I cannot use it, since I need a
feature in 4.3.)

Good luck,
Eric

-- 
Eric Roman                       Department of Physics
510-642-7302                     UC Berkeley