Bug 1112779

Summary:	Iterating mounts can take a few seconds
Product:	Red Hat Enterprise Virtualization Manager	Reporter:	Dima Kuznetsov <dkuznets>
Component:	vdsm	Assignee:	Dima Kuznetsov <dkuznets>
Status:	CLOSED CURRENTRELEASE	QA Contact:	Jiri Belka <jbelka>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	3.5.0	CC:	bazulay, gklein, iheim, lpeer, oourfali, pstehlik, sherold, ybronhei, yeylon
Target Milestone:	---
Target Release:	3.5.0
Hardware:	x86_64
OS:	Linux
Whiteboard:	infra
Fixed In Version:	vt3	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2015-02-16 13:40:28 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	Infra	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:
Bug Blocks:	1142923, 1156165

Description Dima Kuznetsov 2014-06-24 16:24:47 UTC

Description of problem:
On hosts with large amount of mounts, iterating active mounts can lead to big delays, because for each mount encountered, all active mounts are checked.

Version-Release number of selected component (if applicable):
4.15


How reproducible:
100%, tests reproducing the behavior provided in patch.


Steps to Reproduce:
1. Have about 1000 mounts
2. call some code that iterates mounts

Actual results:
With tests provided, for 1000 mount entries, iteration took 11 second

Expected results:
After adding caching, iteration reduced to 0.1 seconds.


Additional info:

Comment 1 Eyal Edri 2014-09-10 20:21:40 UTC

fixed in vt3, moving to on_qa.
if you believe this bug isn't released in vt3, please report to rhev-integ

Comment 2 Jiri Belka 2014-10-02 16:40:14 UTC

ok, vdsm-4.14.17-1.el6ev.x86_64

`time vdsClient -s 0 getStorageDomainsList' is always OK, also CPU usage is low.