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| tidwellr | slaweq: ping | 14:07 |
|---|---|---|
| slaweq | tidwellr: hi | 14:07 |
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| mlavalle | #startmeeting neutron_performance | 16:00 |
| openstack | Meeting started Mon Jul 1 16:00:27 2019 UTC and is due to finish in 60 minutes. The chair is mlavalle. Information about MeetBot at http://wiki.debian.org/MeetBot. | 16:00 |
| openstack | Useful Commands: #action #agreed #help #info #idea #link #topic #startvote. | 16:00 |
| *** openstack changes topic to " (Meeting topic: neutron_performance)" | 16:00 | |
| openstack | The meeting name has been set to 'neutron_performance' | 16:00 |
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| njohnston | o/ | 16:00 |
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| slaweq | hi | 16:01 |
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| haleyb | hi | 16:01 |
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| mlavalle | ok, let's get going | 16:04 |
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| mlavalle | #topic Rally / osprofiler / EnOS | 16:05 |
| *** openstack changes topic to "Rally / osprofiler / EnOS (Meeting topic: neutron_performance)" | 16:05 | |
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| mlavalle | I have progress updates on this topic | 16:06 |
| mlavalle | after the message that the EnOS sent us with guidelines, all the small hurdles that I was facing to start running tests we re solved | 16:06 |
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| mlavalle | I was able to deploy the test that rubasov is implementing in rally-openstack: https://review.opendev.org/#/c/662781/ | 16:08 |
| mlavalle | I uploaded the rally report to dropbox: | 16:09 |
| mlavalle | #link https://www.dropbox.com/s/ggk26tokkob4w8s/bind_port_rally_report.html?dl=0 | 16:09 |
| njohnston | coool | 16:09 |
| mlavalle | so you can see the results of the task as it is defined by the patch | 16:09 |
| mlavalle | I also uploaded for you a osprofiler report of an iteration reprsesentative of the average in the rally report: | 16:11 |
| mlavalle | #link https://www.dropbox.com/s/ojigqb32swvdrgx/bind_port_avg.html?dl=0 | 16:12 |
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| mlavalle | and a osprofiler report of the iteration with the highest elapsed time: | 16:13 |
| mlavalle | #link https://www.dropbox.com/s/ojigqb32swvdrgx/bind_port_avg.html?dl=0 | 16:14 |
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| slaweq | I wonder where on create_subnet it spends about 7 seconds in this example | 16:15 |
| mlavalle | These are html files, so you need to download them and view them in your browser | 16:15 |
| slaweq | creation of subnet is "just" db operation, right? | 16:15 |
| mlavalle | it is | 16:15 |
| slaweq | mlavalle: and Your environment wasn't overloaded by other tasks during time when You run this test, right? | 16:16 |
| mlavalle | well, it interacts with the dhcp agent | 16:16 |
| mlavalle | but I don't think that's the problem | 16:16 |
| mlavalle | and no, my test environment is not overloades | 16:16 |
| slaweq | mlavalle: to be sure if that is not a problem, can You run same test but with subnets with dhcp disabled? | 16:17 |
| mlavalle | sure | 16:17 |
| mlavalle | that's a good suggestion | 16:17 |
| slaweq | thx | 16:19 |
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| mlavalle | one problem that I am finding with the osprofiler report is that we get a lot of lines of sqlalchemy tracing | 16:20 |
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| mlavalle | and they contain very detailed info on the DB operation | 16:20 |
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| mlavalle | problem is that the context info (i.e. where in the code that DB operation was issued) is lacking | 16:21 |
| slaweq | yes | 16:21 |
| mlavalle | so it is diffecult to relate the trace to the code | 16:21 |
| slaweq | I also noticed that | 16:21 |
| njohnsto_ | yep, logging that is outside the scope of sql alchemy IMHO | 16:21 |
| mlavalle | so I am going to ping Andrey Kurilin and see if he has any suggestions | 16:23 |
| mlavalle | slaweq: do you remember his email address | 16:23 |
| slaweq | mlavalle: no but I will find it and send it to You, ok? | 16:23 |
| mlavalle | slaweq: not needed. thanks. found it in gerrit | 16:24 |
| slaweq | mlavalle: You can also try to catch him on #openstack-rally channel, his nick is andreykurilin | 16:24 |
| mlavalle | anyways. Next steps are: | 16:24 |
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| mlavalle | 1) Play with this scenario changing the load and concurrency parameters | 16:25 |
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| mlavalle | 2) Try to add conteext info to the osprofiler traces | 16:25 |
| mlavalle | 3) Investigate the subnet creation anomaly as suggested by slaweq | 16:26 |
| mlavalle | any other comments on this topic? | 16:27 |
| slaweq | IMHO each operation there takes very long time | 16:27 |
| mlavalle | it does | 16:27 |
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| slaweq | port create is almost as long as port update (binding) later | 16:27 |
| slaweq | and port create is also only: | 16:27 |
| slaweq | 1. db operations | 16:27 |
| mlavalle | and it is a lot of DB operations | 16:27 |
| slaweq | 2. ipam - but as for each port it is new subnet than ipam should be fast IMO because no retries should be there | 16:28 |
| mlavalle | you can see that in the osprofiler reports | 16:28 |
| slaweq | 3. dhcp agent update | 16:28 |
| slaweq | so basically before I looked into it I was expecting that it will be something with most of the time spend on port update (port binding) | 16:29 |
| slaweq | and it's not - everything else is also slow :/ | 16:29 |
| slaweq | do You agree with me or am I missing something? | 16:29 |
| mlavalle | agree with you | 16:29 |
| mlavalle | and the fact is that it is almost all db operations | 16:30 |
| mlavalle | if you look at the osprofiler reports | 16:30 |
| mlavalle | that is why I want to be able to relate the reports with the code | 16:30 |
| slaweq | yes | 16:31 |
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| mlavalle | going back to your question about how much load I have in my test environment | 16:31 |
| mlavalle | I am monitoring continously the syste with top | 16:31 |
| mlavalle | it has 32 threads | 16:32 |
| mlavalle | all of wich are almost idle | 16:32 |
| mlavalle | unless I trigger the rally workload | 16:32 |
| mlavalle | and even then it is not very loaded | 16:32 |
| mlavalle | so it's not the test environment | 16:33 |
| mlavalle | any oher comments? | 16:33 |
| slaweq | great work mlavalle, thx :) | 16:33 |
| mlavalle | :-) | 16:34 |
| mlavalle | ok, let's move on | 16:34 |
| mlavalle | #topic Security groups and RBAC | 16:34 |
| *** openstack changes topic to "Security groups and RBAC (Meeting topic: neutron_performance)" | 16:34 | |
| mlavalle | I have continued digging into https://bugs.launchpad.net/neutron/+bug/1830679 | 16:35 |
| openstack | Launchpad bug 1830679 in neutron "Security groups RBAC cause a major performance degradation" [High,In progress] - Assigned to Miguel Lavalle (minsel) | 16:35 |
| mlavalle | Taking a suggestion from njohnsto_, I've been doing some profiling with cProfile | 16:35 |
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| mlavalle | I posted one cProfile report in the bug and explained where I am conducting the profiling | 16:37 |
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| mlavalle | you can see the details in the report | 16:38 |
| * njohnsto_ will check it out | 16:38 | |
| mlavalle | but the conclusion is that querying 6000 security groups from the DB doesn't take much | 16:38 |
| mlavalle | whre we spend a lot of time is building the objects after retrieving the from the DB is here: https://github.com/openstack/neutron/blob/master/neutron/objects/base.py#L800 | 16:39 |
| slaweq | and it spends most of this time on calculating if SG is shared with tenant or not, am I understanding correct what You wrote in bug? | 16:40 |
| njohnsto_ | should we call on zzzeek’s expert opinion on this? | 16:41 |
| mlavalle | slaweq: I have some second thoughts about that comment | 16:41 |
| mlavalle | the point is that we spend a lot of time building the objects from the DB | 16:41 |
| mlavalle | the DB query is almost nothing | 16:42 |
| mlavalle | njohnsto_: that might be a good step | 16:42 |
| mlavalle | but before that here's the strategy I intend to test later today: | 16:42 |
| mlavalle | Instead of calling https://github.com/openstack/neutron/blob/master/neutron/objects/base.py#L617 blindly and let it retrieve all the objects from the DB | 16:43 |
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| mlavalle | I am going to query the DB from here: https://github.com/openstack/neutron/blob/master/neutron/objects/base.py#L617 | 16:44 |
| njohnsto_ | that is the same link | 16:44 |
| mlavalle | and build a specifc query instead of calling obj_db_api.get_objects | 16:45 |
| mlavalle | in other words, instead of querying all the objects, I am going to query only the objects that the tenenat has access to | 16:45 |
| njohnsto_ | good idea | 16:45 |
| mlavalle | either because it owns the object or because there is a rbac entry that grants the access | 16:46 |
| mlavalle | that way, the number of OVOs to build will be much lower | 16:46 |
| mlavalle | and in the case where there are no rbac entries, that user / deployer doesn't pay any extra cost | 16:47 |
| mlavalle | does it make sense? | 16:47 |
| njohnsto_ | +1 | 16:47 |
| mlavalle | cool | 16:47 |
| mlavalle | the only other observation I want to make is that last night I was wondering how many times we call get_objects from the base class blindly and let it retrieve all the objects from the DB | 16:48 |
| slaweq | +1 | 16:48 |
| mlavalle | and then we filter later | 16:49 |
| njohnsto_ | Yes, that is definitely a bad pattern for operations at scale | 16:49 |
| mlavalle | maybe after fixing this specific bug I am going to dig in the code looking for cases like this | 16:49 |
| mlavalle | because if we retrieve a lot of objects from the DB, build the OVO's and then we filter | 16:50 |
| mlavalle | we wasted a lot of resource building the OVOs | 16:50 |
| njohnsto_ | +1 | 16:50 |
| mlavalle | ok, that's all I had for today | 16:51 |
| mlavalle | any other comments? | 16:51 |
| slaweq | I wanted to ask about one thing | 16:51 |
| slaweq | in launchpad we have tag "loadimpact" to bugs related to performance problems | 16:51 |
| slaweq | here is the list of bugs with this tag: | 16:51 |
| slaweq | https://bugs.launchpad.net/neutron/+bugs?field.searchtext=&search=Search&field.status%3Alist=NEW&field.status%3Alist=CONFIRMED&field.status%3Alist=TRIAGED&field.status%3Alist=INPROGRESS&field.status%3Alist=FIXCOMMITTED&field.status%3Alist=INCOMPLETE_WITH_RESPONSE&field.status%3Alist=INCOMPLETE_WITHOUT_RESPONSE&assignee_option=any&field.assignee=&field.bug_reporter=&field.bug_commenter=&field.subscr | 16:51 |
| slaweq | iber=&field.structural_subscriber=&field.tag=loadimpact&field.tags_combinator=ANY&field.has_cve.used=&field.omit_dupes.used=&field.omit_dupes=on&field.affects_me.used=&field.has_patch.used=&field.has_branches.used=&field.has_branches=on&field.has_no_branches.used=&field.has_no_branches=on&field.has_blueprints.used=&field.has_blueprints=on&field.has_no_blueprints.used=&field.has_no_blueprints=on&ord | 16:51 |
| slaweq | erby=-importance&start=0 | 16:52 |
| slaweq | should we maybe: | 16:52 |
| slaweq | 1. clean this list and close old/already fixed bugs? | 16:52 |
| slaweq | 2. check this list during those meetings? | 16:52 |
| slaweq | what do You think? | 16:52 |
| mlavalle | excellent idea | 16:52 |
| mlavalle | I'll try to start with the clean up | 16:53 |
| slaweq | thx a lot :) | 16:53 |
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| slaweq | that's all from me | 16:53 |
| mlavalle | cool | 16:53 |
| mlavalle | Thanks for attending | 16:53 |
| mlavalle | have a great week! | 16:53 |
| mlavalle | #endmeeting | 16:53 |
| *** openstack changes topic to "OpenStack Meetings || https://wiki.openstack.org/wiki/Meetings/" | 16:54 | |
| slaweq | You too :) | 16:54 |
| openstack | Meeting ended Mon Jul 1 16:53:59 2019 UTC. Information about MeetBot at http://wiki.debian.org/MeetBot . (v 0.1.4) | 16:54 |
| openstack | Minutes: http://eavesdrop.openstack.org/meetings/neutron_performance/2019/neutron_performance.2019-07-01-16.00.html | 16:54 |
| njohnsto_ | o\ | 16:54 |
| slaweq | o/ | 16:54 |
| openstack | Minutes (text): http://eavesdrop.openstack.org/meetings/neutron_performance/2019/neutron_performance.2019-07-01-16.00.txt | 16:54 |
| openstack | Log: http://eavesdrop.openstack.org/meetings/neutron_performance/2019/neutron_performance.2019-07-01-16.00.log.html | 16:54 |
| mlavalle | o/ | 16:54 |
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