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From: Thomas Koenig
Sent: Saturday, February 26, 2022 10:20:25 AM
To: Bertini, Denis Dr.; Harald Anlauf
Cc: Tobias Burnus; fortran@gcc.gnu.org
Subject: Re: Problem setting buffer size for gfortran ( v 11.2)
On 25.02.22 21:53, Bertini, Denis Dr. via Fortran wrote:
>
On 25.02.22 21:53, Bertini, Denis Dr. via Fortran wrote:
It seems that the value set in the foreseen environment variable is just
ignored.
And always a buffer size of 8kiB is used, which is the default values
for formatted I/O harcoded in libgfortran.
The only way to change this value is editing
the libgfortran.
Best.
Denis
From: Harald Anlauf
Sent: Friday, February 25, 2022 9:44:53 PM
To: Bertini, Denis Dr.
Cc: Tobias Burnus; fortran@gcc.gnu.org
Subject: Re: Problem setting buffer size for gfortran ( v 11.2)
Hi Denis,
> exp
Hi Denis,
export GFORTRAN_UNFORMATTED_BUFFER_SIZE=1
export GFORTRAN_FORMATTED_BUFFER_SIZE=1
export GFORTRAN_UNBUFFERED_ALL=n
From the output log indeed i got the correct env. variable as i set:
GFORTRAN_FORMATTED_BUFFER_SIZE=1
But from strace output i got always
write(3
2@"...,
8192) = 8192
write(3,
"\0\0\0`ff\22@\0\0\0\340\314\314\22@\0\0\0@33\23@\0\0\0\240\231\231\23@"...,
8192) = 8192
write(3, "\0\0\0\0\0\0\24@\0\0\0`ff\24@\0\0\0\340\314\314\24@\0\0\0@33\25@"...,
8192) = 8192
.....
>>>>>>>>>>>>>>>>>>
Showing the
run.
Are the variables set correct ?
Best,
Denis
From: Tobias Burnus
Sent: Thursday, February 24, 2022 9:20:26 AM
To: Bertini, Denis Dr.; Harald Anlauf
Cc: fortran@gcc.gnu.org
Subject: Re: Problem setting buffer size for gfortran ( v 11.2)
Hi Denis,
On 24.02.22
Hi Denis,
On 24.02.22 09:15, Bertini, Denis Dr. via Fortran wrote:
I can try that but on our cluster we are bound to use
srun (slurm).
Do you know how to use the same functionality with srun
to set the environment variables.
I didn't – but the manual did: srun --export=...
See: https://slu
, Denis Dr.; Harald Anlauf
Cc: fortran@gcc.gnu.org
Subject: Re: Problem setting buffer size for gfortran ( v 11.2)
Hi,
On 24.02.22 08:57, Bertini, Denis Dr. via Fortran wrote:
> Additonnaly i ran interactively my test program without slurm on with just
> one MPI process on
I think you eith
Hi,
On 24.02.22 08:57, Bertini, Denis Dr. via Fortran wrote:
Additonnaly i ran interactively my test program without slurm on with just one
MPI process on
I think you either use Open MPI or MPICH. Can you try setting the environment
variable
when invoking MPI by adding the -x or -env (-envli
: Wednesday, February 23, 2022 10:38:20 PM
To: Bertini, Denis Dr.
Cc: fortran@gcc.gnu.org
Subject: Re: Problem setting buffer size for gfortran ( v 11.2)
Hi Denis,
if editing of unix.c works: is it possible that you either
misspelled the name of the environment variable, forgot to
export it, or if you are
um 22:23 Uhr
Von: "Bertini, Denis Dr."
An: "Harald Anlauf"
Cc: "fortran@gcc.gnu.org"
Betreff: Re: Problem setting buffer size for gfortran ( v 11.2)
Hi Harald,
I ran also the same with gfortran v11.2. together with singularity and
did not work as well.
Then i chan
singularity
container?
Best
Denis
From: Harald Anlauf
Sent: Wednesday, February 23, 2022 10:18:17 PM
To: Bertini, Denis Dr.
Cc: fortran@gcc.gnu.org
Subject: Re: Problem setting buffer size for gfortran ( v 11.2)
Hi Denis,
if I'm reading the strace o
behavior.
(E.g. the HDF5 library is known to hit bugs in our Lustre.)
Cheers,
Harald
Best
Denis
From: Harald Anlauf
Sent: Wednesday, February 23, 2022 7:26 PM
To: Bertini, Denis Dr.; fortran@gcc.gnu.org
Subject: Re: Problem setting buffer size for gfortran ( v 1
rg
Subject: Re: Problem setting buffer size for gfortran ( v 11.2)
Hi Denis,
Am 23.02.22 um 17:10 schrieb Bertini, Denis Dr. via Fortran:
> Hi
> Investigating some sporadical performance drop when using Fortran IO on our
> Lustre
> shared file system, we realized that the buffer size
Hi Denis,
Am 23.02.22 um 17:10 schrieb Bertini, Denis Dr. via Fortran:
Hi
Investigating some sporadical performance drop when using Fortran IO on our
Lustre
shared file system, we realized that the buffer size used as default by the gnu
fortran
compiler is 8 kiB only.
We wanted to change this
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