Performance degrade of cpsv expected because of #2202 , we agreed to have
performance degrade in default configuration to address #2202 , if user what
to natural performance OSAF_CKPT_SHM_ALLOC_GUARANTEE is set to true cpsv give
natural performance.
==============================================================================
[devel] [PATCH 1 of 3] leap : now leap library ensure shm availability before
writing [#2202]
On 11/29/2016 4:07 PM, [email protected] wrote:
> Issue :
>
> If OSAF_CKPT_SHM_ALLOC_GUARANTEE is NOT set and SHM is 100% used in system ,
> pnd Segmentation fault (core dumped) at LEAP memcpy().
>
> Fix :
>
> Now LEAP library ensures shm free space before writing
> This may degrade some performance of cpsv , if OSAF_CKPT_SHM_ALLOC_GUARANTEE
> is set,
> cpsv give natural performance.
==============================================================================
---
** [tickets:#2395] CKPT: Performance degradation upto 200%**
**Status:** unassigned
**Milestone:** 5.2.RC2
**Created:** Thu Mar 23, 2017 10:26 AM UTC by Chani Srivastava
**Last Updated:** Mon Mar 27, 2017 06:21 AM UTC
**Owner:** nobody
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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