[LU-12151] metadata performance difference on root and non-root user

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.13.0, Lustre 2.12.1
• Affects Version/s: Lustre 2.10.5
• Environment: lustre-2.10.5-RC2/ldiskfs
• Severity: 3
• Assignee: Wang Shilong (Inactive)
• Reporter: Shuichi Ihara

Description

We found a huge performance difference on file creation with root user and non-root user .

• 1 x MDS(1 x Platinum 8160, 96GB memory, EDR)
• 32 x client(2 x E5-2650 v4, 128GB memory, EDR)
• 1 x ES14K (40 x SSD)

root user

[root@c01 ~]# salloc -N 32 --ntasks-per-node=20 mpirun --allow-run-as-root /work/tools/bin/mdtest -n 1000 -F -v -u -d /scratch0/bmuser/ -C
SUMMARY: (of 1 iterations)
   Operation                      Max            Min           Mean        Std Dev
   ---------                      ---            ---           ----        -------
   File creation     :     151328.449     151328.449     151328.449          0.000
   File stat         :          0.000          0.000          0.000          0.000
   File read         :          0.000          0.000          0.000          0.000
   File removal      :          0.000          0.000          0.000          0.000
   Tree creation     :         42.057         42.057         42.057          0.000
   Tree removal      :          0.000          0.000          0.000          0.000
V-1: Entering timestamp...

Non-root user

[bmuser@c01 ~]$ salloc -N 32 --ntasks-per-node=20 mpirun --allow-run-as-root /work/tools/bin/mdtest -n 1000 -F -v -u -d /scratch0/bmuser/ -C
SUMMARY: (of 1 iterations)
   Operation                      Max            Min           Mean        Std Dev
   ---------                      ---            ---           ----        -------
   File creation     :     102825.662     102825.662     102825.662          0.000
   File stat         :          0.000          0.000          0.000          0.000
   File read         :          0.000          0.000          0.000          0.000
   File removal      :          0.000          0.000          0.000          0.000
   Tree creation     :         30.589         30.589         30.589          0.000
   Tree removal      :          0.000          0.000          0.000          0.000
V-1: Entering timestamp...

150K (root) vs 100K (non-root)

Issue Links

• is related to: LU-13239 ldiskfs: pass initial inode attributes at creation time