[gpfsug-discuss] FIle system vs Database

[Skylar Thompson]

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 (skylar2 at u.washington.edu)
-- Genome Sciences Department, System Administrator
-- Foege Building S046, (206)-685-7354
-- University of Washington School of Medicine