[gpfsug-discuss] GPFS bad at memory-mapped files?

Saula, Oluwasijibomi oluwasijibomi.saula at ndsu.edu
Tue Jun 22 16:17:16 BST 2021


While reviewing AMS software suite for installation, I noticed this remark (https://www.scm.com/doc/Installation/Additional_Information_and_Known_Issues.html#gpfs-file-system):


GPFS file system<https://www.scm.com/doc/Installation/Additional_Information_and_Known_Issues.html#gpfs-file-system>

Starting with AMS2019, the KF sub-system (used for handling binary files such as ADF’s TAPE* files) has been rewritten to use memory-mapped files. The mmap() system call implementation is file-system dependent and, unfortunately, it is not equally efficient in different file systems. The memory-mapped files implementation in GPFS is extremely inefficient. Therefore the users should avoid using a GPFS for scratch files


Is this claim true? Are there caveats to this statement, if true?


Oluwasijibomi (Siji) Saula

HPC Systems Administrator  /  Information Technology

Research 2 Building 220B / Fargo ND 58108-6050

p: 701.231.7749 / www.ndsu.edu<http://www.ndsu.edu/>

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