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Hi,

On Fri, Nov 27, 2020 at 2:00 PM Sergii Golovatiuk <sgolovat at redhat.com>
wrote:

> Hi,
>
> LZMA causes very high CPU and memory usage for creating images, leaving
> less resources for other processes. If Ironic is running alongside with
> other services that may cause significant impact for them. I would leave
> gzip option as default, would introduce --lzma as well as --gzip and use
> lzma on 5-10% of our CI resources to test how it goes. Then after a
> significant amount of testing we could turn it on as default. Proper
> deprecation should be applied here as well IMHO.
>

LZMA packing won't happen on ironic nodes. The images are pre-built and
only unpacked on the target machines.

Or does TripleO build images every time?

Dmitry


>
> чт, 26 нояб. 2020 г. в 17:57, Dmitry Tantsur <dtantsur at redhat.com>:
>
>> Hi folks,
>>
>> I've been playing with ways to reduce the size of our IPA images. While
>> package removals can only save us tens of megabytes, switching from gzip to
>> lzma reduces the size by around a third (from 373M to 217M in my testing).
>>
>> What's the caveat? The unpacking time increases VERY substantially. On my
>> nested virt lab the 217M image took around 5 minutes to unpack. I'm not
>> sure how much it will impact real bare metal, please feel free to test
>> https://review.opendev.org/c/openstack/ironic-python-agent-builder/+/764371
>> and tell me.
>>
>> So, what do you think? Switching to lzma by default will likely affect CI
>> run time (assuming we still have DIB jobs somewhere...) and development
>> environments, but it will also provide a visible reduction in the image
>> size (which benefit all environments). Large TripleO images may
>> particularly benefit from this (but also particularly affected by the
>> unpacking time).
>>
>> Feedback is very welcome.
>>
>> Dmitry
>>
>> --
>> Red Hat GmbH, https://de.redhat.com/ , Registered seat: Grasbrunn,
>> Commercial register: Amtsgericht Muenchen, HRB 153243,
>> Managing Directors: Charles Cachera, Brian Klemm, Laurie Krebs, Michael
>> O'Neill
>>
>
>
> --
> Sergii Golovatiuk
>
> Senior Software Developer
>
> Red Hat  <https://www.redhat.com/>
> <https://www.redhat.com/>
>


-- 
Red Hat GmbH, https://de.redhat.com/ , Registered seat: Grasbrunn,
Commercial register: Amtsgericht Muenchen, HRB 153243,
Managing Directors: Charles Cachera, Brian Klemm, Laurie Krebs, Michael
O'Neill
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