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https://issues.apache.org/jira/browse/CLOUDSTACK-8917?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sudhansu Sahu updated CLOUDSTACK-8917:
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Description:
In load test environment listVirtualmachine takes 8-11 sec to load.
Performance bottleneck in listVirtualmachine command is fetching the count and
distinct vms.
{noformat}
// search vm details by ids
Pair<List<UserVmJoinVO>, Integer> uniqueVmPair =
_userVmJoinDao.searchAndCount(sc, searchFilter);
Integer count = uniqueVmPair.second();
{noformat}
This takes 95% of the total time.
To fetch the count and distinct vms we are using below sqls.
Query 1: SELECT DISTINCT(user_vm_view.id) FROM user_vm_view WHERE
user_vm_view.account_type != 5 AND user_vm_view.display_vm = 1 AND
user_vm_view.removed IS NULL ORDER BY user_vm_view.id ASC LIMIT 0, 20
Query 2: select count(distinct id) from user_vm_view WHERE
user_vm_view.account_type != 5 AND user_vm_view.display_vm = 1 AND
user_vm_view.removed IS NULL
Query 2 is a problematic query.
If we rewrite the query as mentioned below then it will be ~2x faster.
select count(*) from (select distinct id from user_vm_view WHERE
user_vm_view.account_type != 5 AND user_vm_view.display_vm = 1 AND
user_vm_view.removed IS NULL) as temp;
> Instance tab takes long time to load with 12K active VM (total vms: 40K)
> ------------------------------------------------------------------------
>
> Key: CLOUDSTACK-8917
> URL: https://issues.apache.org/jira/browse/CLOUDSTACK-8917
> Project: CloudStack
> Issue Type: Bug
> Security Level: Public(Anyone can view this level - this is the
> default.)
> Components: Management Server
> Affects Versions: 4.6.0
> Reporter: Sudhansu Sahu
>
> In load test environment listVirtualmachine takes 8-11 sec to load.
> Performance bottleneck in listVirtualmachine command is fetching the count
> and distinct vms.
> {noformat}
> // search vm details by ids
> Pair<List<UserVmJoinVO>, Integer> uniqueVmPair =
> _userVmJoinDao.searchAndCount(sc, searchFilter);
> Integer count = uniqueVmPair.second();
> {noformat}
>
> This takes 95% of the total time.
> To fetch the count and distinct vms we are using below sqls.
>
> Query 1: SELECT DISTINCT(user_vm_view.id) FROM user_vm_view WHERE
> user_vm_view.account_type != 5 AND user_vm_view.display_vm = 1 AND
> user_vm_view.removed IS NULL ORDER BY user_vm_view.id ASC LIMIT 0, 20
>
> Query 2: select count(distinct id) from user_vm_view WHERE
> user_vm_view.account_type != 5 AND user_vm_view.display_vm = 1 AND
> user_vm_view.removed IS NULL
>
> Query 2 is a problematic query.
> If we rewrite the query as mentioned below then it will be ~2x faster.
> select count(*) from (select distinct id from user_vm_view WHERE
> user_vm_view.account_type != 5 AND user_vm_view.display_vm = 1 AND
> user_vm_view.removed IS NULL) as temp;
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