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Hey Fuelers,

When we are going to enable it? I think since HCF is passed for
stable/8.0, it's time to enable task-based deployment for master
branch.

Opinion?

- Igor

On Wed, Feb 3, 2016 at 12:31 PM, Bogdan Dobrelya <bdobrelia at mirantis.com> wrote:
> On 02.02.2016 17:35, Alexey Shtokolov wrote:
>> Hi Fuelers!
>>
>> As you may be aware, since [0] Fuel has implemented a new orchestration
>> engine [1]
>> We switched the deployment paradigm from role-based (aka granular) to
>> task-based and now Fuel can deploy all nodes simultaneously using
>> cross-node dependencies between deployment tasks.
>
> That is great news! Please do not forget about docs updates as well.
> Those docs are always forgotten like poor orphans... I submitted a patch
> [0] to MOS docs, please review and add more details, if possible, for
> plugins impact as well.
>
> [0] https://review.fuel-infra.org/#/c/16509/
>
>>
>> This feature is experimental in Fuel 8.0 and will be enabled by default
>> for Fuel 9.0
>>
>> Allow me to show you the results. We made some benchmarks on our bare
>> metal lab [2]
>>
>> Case #1. 3 controllers + 7 computes w/ ceph.
>> Task-based deployment takes *~38* minutes vs *~1h15m* for granular (*~2*
>> times faster)
>> Here and below the deployment time is average time for 10 runs
>>
>> Case #2. 3 controllers + 3 mongodb + 4 computes w/ ceph.
>> Task-based deployment takes *~41* minutes vs *~1h32m* for granular
>> (*~2.24* times faster)
>>
>>
>>
>> Also we took measurements for Fuel CI test cases. Standard BVT (Master
>> node + 3 controllers + 3 computes w/ ceph. All are in qemu VMs on one host)
>>
>> Fuel CI slaves with *4 *cores *~1.1* times faster
>> In case of 4 cores for 7 VMs they are fighting for CPU resources and it
>> marginalizes the gain of task-based deployment
>>
>> Fuel CI slaves with *6* cores *~1.6* times faster
>>
>> Fuel CI slaves with *12* cores *~1.7* times faster
>
> These are really outstanding results!
> (tl;dr)
> I believe the next step may be to leverage the "external install & svc
> management" feature (example [1]) of the Liberty release (7.0.0) of
> Puppet-Openstack (PO) modules. So we could use separate concurrent
> cross-depends based tasks *within a single node* as well, like:
> - task: install_all_packages - a singleton task for a node,
> - task: [configure_x, for each x] - concurrent for a node,
> - task: [manage_service_x, for each x] - some may be concurrent for a
> node, while another shall be serialized.
>
> So, one might use the "--tags" separator for concurrent puppet runs to
> make things go even faster, for example:
>
> # cat test.pp
> notify
> {"A": tag => "a" }
> notify
> {"B": tag => "b" }
>
> # puppet apply test.pp
> Notice: A
> Notice: /Stage[main]/Main/Notify[A]/message: defined 'message' as 'A'
> Notice: B
> Notice: /Stage[main]/Main/Notify[B]/message: defined 'message' as 'B'
>
> # puppet apply test.pp --tags a
> Notice: A
> Notice: /Stage[main]/Main/Notify[A]/message: defined 'message' as 'A'
>
> # puppet apply test.pp --tags a & puppet apply test.pp --tags b
> Notice: B
> Notice: /Stage[main]/Main/Notify[B]/message: defined 'message' as 'B'
> Notice: A
> Notice: /Stage[main]/Main/Notify[A]/message: defined 'message' as 'A'
>
> Which is supposed to be faster, although not for this example.
>
> [1] https://review.openstack.org/#/c/216926/3/manifests/init.pp
>
>>
>> You can see additional information and charts in the presentation [3].
>>
>> [0]
>> - http://lists.openstack.org/pipermail/openstack-dev/2015-December/082093.html
>> [1]
>> - https://specs.openstack.org/openstack/fuel-specs/specs/8.0/task-based-deployment-mvp.html
>> [2] -  3 x HP ProLiant DL360p Gen8 (XeonE5 6 cores/64GB/SSD)  + 7 x HP
>> ProLiant DL320p Gen8 (XeonE3 4 cores/8-16GB/HDD)
>> [3] -
>> https://docs.google.com/presentation/d/1jZCFZlXHs_VhjtVYS2VuWgdxge5Q6sOMLz4bRLuw7YE
>>
>> ---
>> WBR, Alexey Shtokolov
>>
>>
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>
>
> --
> Best regards,
> Bogdan Dobrelya,
> Irc #bogdando
>
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