I did verify performance degrade is not because of feature #2395.
The statistics WITH #2395 feature enable and disabled the % of degrade is
ignoreable.
Irrelevant of this #2395 feature still we do see 70% to 100% performance
degrade in observed
this could be because of some other changes like `cpnd: use shared memory based
on ckpt name length [#2108]` where the SHM change are related to support
longDN, currently I am in the process of isolating the change which are
causing the performance degrade, will update as soon as possible.
---
** [tickets:#2395] CKPT: Performance degradation ~100% (Time taken is almost
double than previous)**
**Status:** assigned
**Milestone:** 5.2.0
**Created:** Thu Mar 23, 2017 10:26 AM UTC by Chani Srivastava
**Last Updated:** Wed Apr 05, 2017 02:53 PM UTC
**Owner:** A V Mahesh (AVM)
Environment details
OS : Suse 11, 64bit Physical machine
Changeset : 8634 ( 5.2.FC)
Setup : 4 nodes
There is considerable degradation in CKPT performance in 5.2 when compared to
5.1. The times are calculated just before api and after api for which time
difference is calculated.
-> For write operations, checkpoint write api is taking 2x the time taken in
earlier release 5.1. Issue is observed in both synchronous and asynchronous
mode.
( synchronous -- Checkpoint create flags used : SA_CKPT_WR_ALL_REPLICAS
asynchronous -- Checkpoint create flag used : SA_CKPT_WR_ACTIVE_REPLICA |
SA_CKPT_CHECKPOINT_COLLOCATED ) Both local and remote replica
-> For section create operations in asynchronous mode for local replica,
checkpoint section create api is taking more than 70% the earlier value in 5.1
-> For read operations in asynchronous mode for local replica, checkpoint read
api is taking twice the time than in earlier value in 5.1
Please check the tickets pushed as part of 4.7 to 5.0, for which API
performance got affected.
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