Mikhail Dubov 30b1ad593f Restructure Rally docs

Modify Rally docs (for readthedocs), sticking to the following principles:
* Make the docs structure as simple as possible:
    1. Overview
    2. Install Rally
    3. Rally step-by-step
    4. User stories
    5. Plugins
    6. Contribute to Rally
    7. Rally OS Gates
    8. Request a New Feature
    9. Project Info
* Keep in mind what questions different target groups usually have about Rally.
  The new structure relates to these groups as follows:
    1 -> Managers
    2, 3, 4 -> QA
    5, 6, 7, 8, 9 -> QA & Developers
* Make each docs page to be easy to get through;
* Prefer pictures over text;
* Use hyperlinks to easily navigate from page to page;
* Fix incorrect English & typos.

Also add a sample for SLA plugins.

Change-Id: I720d87be851c273689a21aaba87fc67eacf0f161

2015-01-20 00:27:30 +03:00

6.2 KiB

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4x performance increase in Keysone inside Apache using the token creation benchmark

(Contributed by Neependra Khare, Red Hat)

Below we describe how we were able to get and verify a 4x better performance of Keysone inside Apache. To do that, we ran a Keystone token creation benchmark with Rally under different load (this benchmark scenario essentially just authenticates users with keystone to get tokens).

Goal

Get the data about performance of token creation under different load.
Ensure that keystone with increased public_workers/admin_workers values and under Apache works better than the default setup.

Summary

As the concurrency increases, time to authenticate the user gets up.
Keystone is CPU bound process and by default only one thread of keystone-all process get started. We can increase the parallelism by :-
1. increasing public_workers/admin_workers values in keystone.conf file
2. running keystone inside Apache
We configured Keystone with 4 public_workers and ran Keystone inside Apache. In both cases we got upto 4x better performance as compared to default keystone configuration.

Setup

Server : Dell PowerEdge R610

CPU make and model : Intel(R) Xeon(R) CPU X5650 @ 2.67GHz

CPU count: 24

RAM : 48 GB

Devstack - Commit#d65f7a2858fb047b20470e8fa62ddaede2787a85

Keystone - Commit#455d50e8ae360c2a7598a61d87d9d341e5d9d3ed

Keystone API - 2

To increase public_workers - Uncomment line with public_workers and set public_workers to 4. Then restart keystone service.

To run keystone inside Apache - Added APACHE_ENABLED_SERVICES=key in localrc file while setting up OpenStack environment with devstack.

Results

Concurrency = 4

{'context': {'users': {'concurrent': 30,
                       'tenants': 12,
                       'users_per_tenant': 512}},
                       'runner': {'concurrency': 4, 'times': 10000, 'type': 'constant'}}

action	min (sec)	avg (sec)	max (sec)	90 percentile	95 percentile	success	count	apache enabled keystone	public_workers
total	0.537	0.998	4.553	1.233	1.391	100.0%	10000	N	1
total	0.189	0.296	5.099	0.417	0.474	100.0%	10000	N	4
total	0.208	0.299	3.228	0.437	0.485	100.0%	10000	Y	NA

Concurrency = 16

{'context': {'users': {'concurrent': 30,
                       'tenants': 12,
                       'users_per_tenant': 512}},
                       'runner': {'concurrency': 16, 'times': 10000, 'type': 'constant'}}

action	min (sec)	avg (sec)	max (sec)	90 percentile	95 percentile	success	count	apache enabled keystone	public_workers
total	1.036	3.905	11.254	5.258	5.700	100.0%	10000	N	1
total	0.187	1.012	5.894	1.61	1.856	100.0%	10000	N	4
total	0.515	0.970	2.076	1.113	1.192	100.0%	10000	Y	NA

Concurrency = 32

{'context': {'users': {'concurrent': 30,
                       'tenants': 12,
                       'users_per_tenant': 512}},
                       'runner': {'concurrency': 32, 'times': 10000, 'type': 'constant'}}

action	min (sec)	avg (sec)	max (sec)	90 percentile	95 percentile	success	count	apache enabled keystone	public_workers
total	1.493	7.752	16.007	10.428	11.183	100.0%	10000	N	1
total	0.198	1.967	8.54	3.223	3.701	100.0%	10000	N	4
total	1.115	1.986	6.224	2.133	2.244	100.0%	10000	Y	NA

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