[erlang-questions] "detached VM" vs "VM under screen"

Zabrane Mickael <>
Sat Jan 7 00:15:29 CET 2012


Hi Garrett,

I've tried to reproduce you example by copy and past
on both Linux/OSX R14B04 and OSX R15B:

Each time I kill one of these process:
- beam
- run_erl
- heart

the two others die too.

I can't explain why.

By the way, the test
echo "1 + 1." | to_erl /tmp/test/
works perfectly

Regards,
Zabrane

On Jan 6, 2012, at 9:19 PM, Garrett Smith wrote:

> On Fri, Jan 6, 2012 at 12:58 PM, dmitry kolesnikov
> <> wrote:
>> Hello,
>> Recently I meet issue with run_erl and heart. Heart monitors only beam
>> process, if run_erl dies then to_erl cannot access console. I am
>> planning to rollback into remote shell approach.
> 
> This is not true. You may be seeing something environment specific or
> have a configuration issue.
> 
> FWIW, I've used run_erl in a large variety of production settings and
> would strongly recommend it.
> 
> Here's what I see on Linux R14B04:
> 
> $ mkdir /tmp/test
> $ pgrep beam && pgrep run_erl # confirm no running Erlang procs
> $ HEART_COMMAND="run_erl -daemon /tmp/test/ /tmp/test/ 'erl -heart'"
> run_erl -daemon /tmp/test/ /tmp/test/ "erl -heart"
> $ pgrep beam && pgrep run_erl
> 8618
> 8616
> $ echo "1 + 1." | to_erl /tmp/test/
> Attaching to /tmp/test/erlang.pipe.3 (^D to exit)
> 
> [EOF]
> $ tail -n3 /tmp/test/erlang.log.1
> 1> 1 + 1.
> 2
> $ pkill run_erl
> $ pgrep beam && pgrep run_erl
> 8703
> 8701
> $ echo "2 + 2." | to_erl /tmp/test/
> Attaching to /tmp/test/erlang.pipe.4 (^D to exit)
> 
> [EOF]
> $ tail -n3 /tmp/test/erlang.log.1
> 1> 2 + 2.
> 4
> $ pkill beam
> $ pgrep beam && pgrep run_erl
> 8753
> 8751
> $ echo "4 + 4." | to_erl /tmp/test/
> Attaching to /tmp/test/erlang.pipe.5 (^D to exit)
> 
> [EOF]
> $ tail -n3 /tmp/test/erlang.log.1
> 1> 4 + 4.
> 8
> $ pkill heart
> $ pgrep beam && pgrep run_erl






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