On Thu, Mar 30, 2017 at 8:03 PM, Alistair Grant <akgrant0710@gmail.com> wrote:

On 30 March 2017 at 11:58, Pavel Krivanek <pavel.krivanek@gmail.com> wrote:
> Yes, the same priority. See:
>
> The VM may have issues with clock jitter due to the heartbeat thread
> not running at elevated priority. An exit may be appropriate in some
> cases, but for most users the above warning is sufficient.
>
> https://github.com/OpenSmalltalk/opensmalltalk-vm/commit/32f321583c69ca27e61ffaff6decc2a3e4b6ca5e
>
> Cheers,
> -- Pavel

From looking at the code, my understanding is that the VM attempts to
elevate the priority of the heartbeat thread, if the elevation fails,
the old behaviour was to exit with a message.�� The new behaviour is to
just warn the user (with a message to stderr) and continue.

Assuming I've read the code correctly, there's a bug that needs to be
fixed: the cat statement won't work as sudo doesn't apply to file
redirection; and I've suggested some more informative text:

--
This VM uses a separate heartbeat thread to update

��

the internal clock.

its internal clock and handle events.

��

For best operation, this thread should run��

��

at real-time priority,

at a higher priority.��

(Real-time priority is something else.)

��

however the VM was unable to change the priority.�� The effect is that

��

the clock may experience some jitter.��

To avoid clock jitter, please

heavily loaded systems may experience some latency issues.

If this occurs, please

��

create the appropriate configuration file in /etc/security/limits.d/
as shown below:

cat <<EOF | sudo tee /etc/security/limits.d/VNAME.conf
* hard rtprio 2 VNAME
* soft rtprio 2 VNAME
EOF

and report to the mail list whether this improves behaviour.��

����

You will need to logout and back in for the changes to take affect.

--

If there's no disagreement or better suggestion, I'll submit a pull
request (probably in a couple of days).

cheers -ben

��

Cheers,
Alistair

> 2017-03-30 11:51 GMT+02:00 Denis Kudriashov <dionisiydk@gmail.com>:
>>
>>
>> 2017-03-29 20:29 GMT+02:00 Pavel Krivanek <pavel.krivanek@gmail.com>:
>>>
>>> Hi,
>>>
>>> I want to let you know that the SSH (git@...) support in Iceberg on Linux
>>> VM now works with the latest threaded VM (get.pharo.org/vmTLatest60). The
>>> threaded VM now runs without root priviledges nor special configuration of
>>> the system.
>>
>>
>> And what the logic now? Heartbeat and VM are in same priory?
>
>