How can I figure out where the performance hit is on NFS #2?
I have two NFS shares that I can write two: NFS #1 and NFS #2.
However, operating on NFS #1 is 3-10 times faster than NFS #2, and I
am curious to know why. As a baseline, I did the same operations on
the local disk, which is over 10 times faster than NFS #1.
Unfortunately, I do not have admin access on any of these systems nor
on the network. But I would like to make helpful suggestions to the
networking and system admins.
Here's a summary of times in seconds for various operations:
Disk Access, Nested Directories,Traverse Directory Tree,Remove Directory Tree
Local Disk,0.26,0.13,0.27
NFS #1,8.72,5.86,4.25
NFS #2,33.50,16.95,46.32
Here's the raw data:
#### on local disks
# create nested directories
$ time -p echo {00..09}/{00..09}/{00..09}/{00..09} | xargs mkdir -p
real 0.26
user 0.03
sys 0.21
# traverse directory tree
$ time -p find . | wc -l
11111
real 0.13
user 0.03
sys 0.10
# remove directory tree
$ time -p rm -rf *
real 0.27
user 0.00
sys 0.26
### NFS #1
# create nested directories
$ time -p echo {00..09}/{00..09}/{00..09}/{00..09} | xargs mkdir -p
real 8.72
user 0.02
sys 0.59
# traverse directory tree
$ time -p find . | wc -l
11111
real 5.86
user 0.05
sys 0.70
# remove directory tree
$ time -p rm -rf *
real 4.25
user 0.06
sys 0.51
### NFS #2
# create nested directories
$ time -p echo {00..09}/{00..09}/{00..09}/{00..09} | xargs mkdir -p
real 33.50
user 0.14
sys 2.15
# traverse directory tree
$ time -p find . | wc -l
11111
real 16.95
user 0.18
sys 1.86
# remove directory tree
$ time -p rm -rf *
real 46.32
user 0.16
sys 3.37
Regards,
- Robert
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