Re: Regarding Files-in-Memory (FiM) feature in Molcas 8.0

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Posted by Mariusz Radon on July 09, 2015 at 16:40:59:

In Reply to: Re: Regarding Files-in-Memory (FiM) feature in Molcas 8.0 posted by Valera on July 09, 2015 at 13:51:30:

Dear Valera,

Thank you for your reply and clarification!

: Yes. it is activated.
: Note, that if you have a fast drive, SDD or plenty of RAM - the speed up will be minimal. The feature has been developed for lustre-like system..

Indeed, it is all about Molcas installation on a system with LUSTRE scratch. I observed very slow execution of rasscf (>10 time slower than expected!), until our administrator recommended me to turn on I/O buffering for the Intel compiler (FORT_BUFFERED=true) and suggested also to play with FiM. Which is what I am struggling against now...

Is there anything else worth trying to speed-up Molcas on a lustre filesystem (serial installation only)?

Best regards,
Mariusz Radon

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