[LU-5663] mds-survey performance regress on master

• Type: Bug
• Resolution: Cannot Reproduce
• Priority: Blocker
• Affects Version/s: Lustre 2.7.0
• Severity: 3
• Assignee: WC Triage
• Reporter: Jinshan Xiong (Inactive)

Description

Recently I ran mds-survey performance tests on master and b2_5 and found significantly performance regressions.

The performance data are as follows:

b2_5:

test name	create	lookup	getattr	setxattr	destroy
p3700_sc0_32t_32dir	157343	1298292	876289	93022	143316
p3700_sc0_64t_32dir	170724	1378018	914515	99558	138258
p3700_sc1_32t_32dir	49900	1279590	881454	98467	33632
p3700_sc1_64t_32dir	40075	1274074	901117	100437	35839

MASTER(pre-2.7)

p3700_sc0_32t_32dir	95035	1124743	124594	76011	53653
p3700_sc0_64t_32dir	40043	1069693	49133	56457	51161
p3700_sc1_32t_32dir	29693	1106520	120479	60920	37890
p3700_sc1_64t_32dir	26208	1165051	383138	59853	38974

PS: p3700 is the test name;
sc0 means mds-survey stripe count 0 test
32t means 32 threads
32dir means 32 directories.

Therefore p3700_sc1_32t_32dir refers to the test {create, lookup,getattr,setxattr,destroy} files with 1 stripe, and there are 32 threads doing the work against 32 different directories.

Issue Links

• is related to: LU-5621 Performance regression in 2.6 branch on file operations to shared directory