Interesting, thanks for the information Marc. Could there be an improvement for something like "ls -l some-dir" using the API, though? Instead of getdents + stat for every file (entering and leaving kernel mode many times), could it be done in one operation with one context switch?
On Thu, Nov 30, 2017 at 03:52:09PM -0500, Marc A Kaplan wrote: > Generally the GPFS API will give you access to some information and > functionality that are not available via the Posix API. > > But I don't think you'll find significant performance difference in cases > where there is functional overlap. > > Going either way (Posix or GPFS-specific) - for each API call the > execution path drops into the kernel - and then if required - an > inter-process call to the mmfsd daemon process. -- -- Skylar Thompson ([email protected]) -- Genome Sciences Department, System Administrator -- Foege Building S046, (206)-685-7354 -- University of Washington School of Medicine _______________________________________________ gpfsug-discuss mailing list gpfsug-discuss at spectrumscale.org http://gpfsug.org/mailman/listinfo/gpfsug-discuss
