[Vm-dev] [Pharo-dev] Problem with OSSubprocess / signals / heartbeat ?

[Esteban Lorenzano]

> On 31 Mar 2017, at 03:43, Ben Coman <btc at openInWorld.com> wrote:
> 
> 
> 
> On Fri, Mar 31, 2017 at 7:17 AM, Petr Fischer <petr.fischer at me.com <mailto:petr.fischer at me.com>> wrote:
> 
> > On Fri, Feb 24, 2017 at 11:57 AM, Holger Freyther <holger at freyther.de <mailto:holger at freyther.de>> wrote:
> > >
> > > Hi!
> > >
> > >> Now, this heartbeat threaded VM is the recommended in the README file, and we see that OSSubprocess generates the exact issue stated. The main problem remains for the moment since Pharo's default download includes not this VM but the itimer one. I talked with Esteban about it and he was aware of these two VM flavours, and the reason why we are using the itimer one is the need to deploy those permission files in /etc, which makes installation a bit less automatic.
> > >
> > > It is not a matter of configuration, e.g. more infrastructure is migrated into docker containers (I run the CI with docker containers) and even as root inside the container you might not be allowed to use realtime priority. And you might not be able to influence how your container is being executed.
> > >
> > > holger
> > >
> > > PS: Have you seen the fix David Lewis made to the UnixProcess plugin, maybe it already helps with your bug as well?
> >
> > If these two commits work out, the threaded VM may become a viable
> > default option...
> > https://github.com/OpenSmalltalk/opensmalltalk-vm/commit/32f321583c69ca27e61ffaff6decc2a3e4b6ca5e <https://github.com/OpenSmalltalk/opensmalltalk-vm/commit/32f321583c69ca27e61ffaff6decc2a3e4b6ca5e>
> > https://github.com/OpenSmalltalk/opensmalltalk-vm/commit/5418a415e9297f601f6d57ee732fd7fd942da08c <https://github.com/OpenSmalltalk/opensmalltalk-vm/commit/5418a415e9297f601f6d57ee732fd7fd942da08c>
> >
> > cheers -ben
> 
> Are these commits immediatelly available in pharo-vm GitHub repository, or I need to compile directly from opensmalltalk-vm?
> 
> I'm not clear on the process Esteban uses to keep pharo-vm up to date with opensmalltalk-vm, 
> but I believe its in.  Its easy to test. Just download latest VM and run without the limits conf.

there is a mirror that runs every hour… but I just publish not failing builds. 
anyway, this will change again soon (™)… to commit also generated sources (I commit packages and let the travis ci to generate the sources now). 

Esteban

>  
> 
> Is it really safe to run VM with normal priority heartbeat?
> 
> 
> Of course user testing is required, 
> but considering how Linux operates with dynamic thread priorities I believe it is safe.  
> 
> cheers -ben

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