[Pvfs2-developers] noatime

[Phil Carns]

There is a minor bug fix in trunk now that makes the "noatime" and 
"nodiratime" mount options work correctly on PVFS.  We have had support 
for this option for a long time but it has not work correctly on recent 
kernels at least.

To test it out, I tried recursively grepping through about 1000 files on 
a single server configuration on my laptop.  Mounting with "-o noatime" 
now speeds up that operation by about 25%.

The reason for the performance benefit is that noatime lets PVFS skip 
sending a setattr request (and berkeley db update) to set the access 
time field every time a file is closed.

-Phil