[Avocado-devel] how to synchronize the execution across multiple machines

[Lukáš Doktor]

Dne 28.7.2017 v 13:03 Yesuraj Abraham napsal(a):
> Dear Lukas,
> Thank you very much for your reply.
> I am yet to try tour solution, meanwhile one more help needed.
> Is there support for partitioning a disk using avocado APIs,  I see there
> are ways to format, however I want to partition too.
Hello Yesuraj,

so far there are just the `avocado.utils.partition` and `avocado.utils.lv_utils` modules and they don't really provide a way to create partitions. Anyway it should not be that hard to cook something up, contributions are welcome. Usually people just go with custom `process.run("fdisk ...")` but well defined API could simplify analyzing test failures.

Lukáš

> 
> Regards,
> Yesuraj
> 
> -----Original Message-----
> From: Lukáš Doktor [mailto:ldoktor at redhat.com]
> Sent: Tuesday, July 25, 2017 11:39 AM
> To: Yesuraj Abraham; Avocado-devel at redhat.com
> Subject: Re: [Avocado-devel] how to synchronize the execution across
> multiple machines
> 
> Dne 24.7.2017 v 14:07 Yesuraj Abraham napsal(a):
>> Hi,
>>
>> Is there a way(plugin) available so that I want to trigger test from
>> host machine as follows,
>>
>>
>>
>> Machine 1 should wait on a barrier which depends on some execution
>> completion at machine2, then machine1 should proceed.
>>
>>
>>
>> I could see the following threads talking about it, however I don’t
>> see the corresponding plugins in avocado source code
>>
>>
>>
>> https://www.redhat.com/archives/avocado-devel/2016-March/msg00025.html
>>
>>
>>
>> https://www.redhat.com/archives/avocado-devel/2016-April/msg00060.html
>>
>>
>>
>> Regards,
>>
>> Yesuraj
>>
> 
> Dear Yesuraj,
> 
> unfortunately there is no real implementation directly in Avocado yet. I
> sent a prototype with a custom barrier code here
> https://github.com/avocado-framework/avocado/pull/1019/commits/b5b2d39574db1a00930a185db769bbdc316d2750#diff-48b1c4588345cfb053381017743f86feR33
> some time ago, but it was considered ugly and we are waiting on a clear RFC
> to support multi-host tests directly in Avocado. Card about that is in
> https://trello.com/c/AnoH6vhP/530-rfc-multiple-machine-support-for-tests (in
> progress for some time)
> 
> There are tcp-based sync primitives in python standard libraries,
> unfortunately the classic barrier is (IIRC) only supported in python3.
> Anyway you can find some backports to python2 as well.
> 
> Hopefully this helped a bit,
> regards,
> Lukáš
> 
> PS: The reason the multi-host RFC is taking so long is that people can use
> custom sync primitives for basic synchronization so we want to deliver real
> multi-host tests with a single result for all targets.
> 


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