[Vm-dev] Headless Image: a Riddle

[Levente Uzonyi]

On Wed, 21 Sep 2011, Igor Stasenko wrote:

>
> On 21 September 2011 14:22, Mircea Filip Lungu <mircea.lungu at gmail.com> wrote:
>>
>> Here is a quick riddle for you:
>>
>> The Context:
>> - os: debian
>> - vm: cog
>> - image: the image from the pier site, in which I updated to the
>> latest version of the pier packages. Pier runs on port 8087.
>>
>> If I run the following line:
>>
>> ~/coglinux/bin/squeak x.image
>>
>> the image starts with no error and port 8087 is open.
>>
>> If I run the following line:
>>
>> ~/coglinux/bin/squeak -nodisplay -nosound x.image
>>
>> the image just blocks and the port 8087 is not open.
>>
>> do you have any idea what could be the reason? I tried with all the
>> possible parameter combinations: (-headless, -vm-display-none)
>>
>
> If pier image is pharo based, which starting from version 1.3
> introducing a logic around headless mode.
> It could be that something wrong there.
> But actually, it was introduced to prevent the situations as you
> describing (just hanging and doing nothing),
> so i cannot tell, what exactly may be wrong there. But most probably
> it is something wrong with startup code,
> which might rely on having UI, which is not there in headless mode.

It's pretty likely that the issue is with Pharo's non-interactive mode vs 
Pier. Since you're using Cog, you can easily find out where the problem is, by 
using kill -USR1 <pid> which prints the content of all stacks to stdout.


Levente

>
>> Thanks,
>> M.
>>
>
>
>
> -- 
> Best regards,
> Igor Stasenko.
>