Whamcloud - gitweb
LU-11623 llite: hash just created files if lock allows
If open|creat (and other intent operations later) returned a lookup bit
as part of the lock, hash the resultant dentry under this lock,
not to trigger further RPCs in subsequent lookups.
Benchmark results:
This patch can significantly improve open-create + stat on the same
client.
This patch in combination with two others:
https://review.whamcloud.com/32157
https://review.whamcloud.com/33585
Improves the 'stat' side of open-create + stat by >10x.
Without patches (master branch commit 26a7abe):
mpirun -np 24 --allow-run-as-root /work/tools/bin/mdtest -n 50000 -d /cache1/out/ -F -C -T -v -w 32k
Operation Max Min Mean Std Dev
--------- --- --- ---- -------
File creation : 3838.205 3838.204 3838.204 0.000
File stat : 33459.289 33459.249 33459.271 0.011
File read : 0.000 0.000 0.000 0.000
File removal : 0.000 0.000 0.000 0.000
Tree creation : 3146.841 3146.841 3146.841 0.000
Tree removal : 0.000 0.000 0.000 0.000
With the three patches:
mpirun -np 24 --allow-run-as-root /work/tools/bin/mdtest -n 50000 -d /cache1/out/ -F -C -T -v -w 32k
SUMMARY rate: (of 1 iterations)
Operation Max Min Mean Std Dev
--------- --- --- ---- -------
File creation : 3822.440 3822.439 3822.440 0.000
File stat : 350620.140 350615.980 350617.193 1.051
File read : 0.000 0.000 0.000 0.000
File removal : 0.000 0.000 0.000 0.000
Tree creation : 2076.727 2076.727 2076.727 0.000
Tree removal : 0.000 0.000 0.000 0.000
Note 33K stats/second vs 350K stats/second.
ls -l time of the mdtest directory is also reduced from 23.5 seconds to
5.8 seconds.
Change-Id: Id5140d1042af7f5ab9052922e11a7eda8f92a29a
Signed-off-by: Oleg Drokin <green@whamcloud.com>
Reviewed-on: https://review.whamcloud.com/33584
Tested-by: Jenkins
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Patrick Farrell <pfarrell@whamcloud.com>