[LU-15547] Shared Directory File Creates regression seen in 2.15 when comparing to 2.12.66.1

Thu, 10 Feb 2022 17:13:13 +0000

When testing mdtest 2.15 (2.14.57) and comparing to 2.12.6, I see a large 25% regression with Shared Directory File Creates. Perf traces (attached) show a lot of extra ldlm overhead.

#!/bin/bash

NODES=21
PPN=16
PROCS=$(( $NODES * $PPN ))
MDT_COUNT=1
PAUSED=120

srun -N $NODES --ntasks-per-node $PPN ~bloewe/benchmarks/ior-3.3.0-CentOS-8.2/install/bin/mdtest -v -i 5 -p $PAUSED -C -E -T -r -n $(( $MDT_COUNT * 1048576 / $PROCS )) -d /mnt/kjlmo2/pkoutoupis/mdt0/test.`date +"%Y%m%d.%H%M%S"` 2>&1 |& tee f_mdt0_0k_ost_shared.out

srun -N $NODES --ntasks-per-node $PPN ~bloewe/benchmarks/ior-3.3.0-CentOS-8.2/install/bin/mdtest -v -i 5 -p $PAUSED -C -w 32768 -E -e 32768 -T -r -n $(( $MDT_COUNT * 1048576 / $PROCS )) -d /mnt/kjlmo2/pkoutoupis/mdt0/test.`date +"%Y%m%d.%H%M%S"` 2>&1 |& tee f_mdt0_32k_ost_shared.out

Whamcloud Community JIRA

[LU-15547] Shared Directory File Creates regression seen in 2.15 when comparing to 2.12.66.1