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OSProcess or OSSubprocess?

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hernanmd

OSProcess or OSSubprocess?

Hi guys,

I need to monitor Unix command execution inside the image. The commands use heavy computation so they usually report progress in the terminal.

Are OSProcess or OSSubprocess ready to do in-image monitoring so I can watch the same terminal output in the Transcript updating for example every 10 seconds?

Particularly for OSProcess I couldn't find any method to fetch partial output.

Cheers,

Hernán

Thierry Goubier

Re: OSProcess or OSSubprocess?

2017-03-20 10:00 GMT+01:00 Hernán Morales Durand <[hidden email]>:

Hi guys,

I need to monitor Unix command execution inside the image. The commands use heavy computation so they usually report progress in the terminal.

Are OSProcess or OSSubprocess ready to do in-image monitoring so I can watch the same terminal output in the Transcript updating for example every 10 seconds?

Particularly for OSProcess I couldn't find any method to fetch partial output.

GitFileTree does fetch partial output over OSProcess, but this is quite a low-level use of OSProcess.

What is missing is true pseudo-tty support.

Regards,

Thierry

Cheers,

Hernán

Mariano Martinez Peck

Re: OSProcess or OSSubprocess?

In reply to this post by hernanmd

On Mon, Mar 20, 2017 at 6:00 AM, Hernán Morales Durand <[hidden email]> wrote:

Hi guys,

I need to monitor Unix command execution inside the image. The commands use heavy computation so they usually report progress in the terminal.

Are OSProcess or OSSubprocess ready to do in-image monitoring so I can watch the same terminal output in the Transcript updating for example every 10 seconds?

Hi Hernan,

There is a tail -f example in OSSubprocess documentation that prints the result on an inpsector and updates it [1]. However, OSSubprocess has problems on Linux with the default VM... you must use the threaded heartbeat (not the itimer).. see recent threads discussions for this.

Let me know if that works.

[1] https://github.com/marianopeck/OSSubprocess#processing-streams-while-running

Particularly for OSProcess I couldn't find any method to fetch partial output.

Cheers,

Hernán

Mariano
http://marianopeck.wordpress.com

alistairgrant

Re: OSProcess or OSSubprocess?

Hi Mariano,

On 20 March 2017 at 12:24, Mariano Martinez Peck <[hidden email]> wrote:

>
> ....
>
> Hi Hernan,
>
> There is a tail -f example in OSSubprocess documentation that prints the
> result on an inpsector and updates it [1]. However, OSSubprocess has
> problems on Linux with the default VM... you must use the threaded heartbeat
> (not the itimer).. see recent threads discussions for this.
>
> Let me know if that works.
>
>
> [1]
> https://github.com/marianopeck/OSSubprocess#processing-streams-while-running

Cool! Thanks for pointing this out. I've just hit the same
requirement, and this will also prompt me to move to the threaded VM.

Cheers!
Alistair

hernanmd

Re: OSProcess or OSSubprocess?

In reply to this post by Mariano Martinez Peck

I just tested and it works nice!! Thank you Mariano.

Just a quick note, to read from /var/log requires root privilege which many users cannot acquire. I tested using a bash script and then tailf the output file:

#!/bin/sh

while true; do
echo $(date)
sleep 2
done > output.txt

Cheers,

Hernán

2017-03-20 8:24 GMT-03:00 Mariano Martinez Peck <[hidden email]>:

On Mon, Mar 20, 2017 at 6:00 AM, Hernán Morales Durand <[hidden email]> wrote:
Hi guys,

I need to monitor Unix command execution inside the image. The commands use heavy computation so they usually report progress in the terminal.

Are OSProcess or OSSubprocess ready to do in-image monitoring so I can watch the same terminal output in the Transcript updating for example every 10 seconds?

Hi Hernan,

There is a tail -f example in OSSubprocess documentation that prints the result on an inpsector and updates it [1]. However, OSSubprocess has problems on Linux with the default VM... you must use the threaded heartbeat (not the itimer).. see recent threads discussions for this.

Let me know if that works.

[1] https://github.com/marianopeck/OSSubprocess#processing-streams-while-running

Particularly for OSProcess I couldn't find any method to fetch partial output.

Cheers,

Hernán

--
Mariano
http://marianopeck.wordpress.com