Re: [Haskell-cafe] Any recommendations on how to interact with the running state of a program?

Anatoly Yakovenko

28 May 2015 28 May '15

9:21 p.m.

How would the program get updated values? via an IORef? This thing is running until the user decides the output looks good Anatoly On Thu, May 28, 2015 at 12:16 PM Carlos López-Camey wrote:

...

Cloud Haskell + Event streaming via some Protocol (like json on websockets) ?

2015-05-25 15:14 GMT-06:00 Anatoly Yakovenko :

...
I am playing around with some deep learning algorithms and I need a way to periodically read the intermediate result and change some of the system variables.

Any ideas on how to best approach this problem? I was thinking of something basic, like having the program periodically read and write from some files.

Thanks, Anatoly

_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/haskell-cafe

Attachments:

attachment.html (text/html — 2.0 KB)

Show replies by date

Charlie Durham

28 May 28 May

9:32 p.m.

New subject: Any recommendations on how to interact with the running state of a program?

Check out the configurator package: https://hackage.haskell.org/package/configurator It has auto reloading of config files through the aptly named autoReload function. Pretty cool stuff. Charlie On Thu, May 28, 2015 at 9:21 PM, Anatoly Yakovenko wrote:

...

How would the program get updated values? via an IORef? This thing is running until the user decides the output looks good

Anatoly

On Thu, May 28, 2015 at 12:16 PM Carlos López-Camey wrote:

...
Cloud Haskell + Event streaming via some Protocol (like json on websockets) ?

2015-05-25 15:14 GMT-06:00 Anatoly Yakovenko :

...
I am playing around with some deep learning algorithms and I need a way to periodically read the intermediate result and change some of the system variables.

Any ideas on how to best approach this problem? I was thinking of something basic, like having the program periodically read and write from some files.

Thanks, Anatoly

_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/haskell-cafe

_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/haskell-cafe

Anatoly Yakovenko

9:48 p.m.

New subject: Any recommendations on how to interact with the running state of a program?

Cool, thanks. But the ChangeHandler would still be modifying some mutable state that some other thread is referencing while it's running. That would still be via an IORef? I guess this is a similar problem as having a play/pause/skip controls to a video player. Is the interface between the "running" thread and the user triggered events an IORef? Or is there some other way to wrap that. Thanks, Anatoly On Thu, May 28, 2015 at 6:32 PM Charlie Durham wrote:

...

Check out the configurator package: https://hackage.haskell.org/package/configurator

It has auto reloading of config files through the aptly named autoReload function. Pretty cool stuff.

Charlie

On Thu, May 28, 2015 at 9:21 PM, Anatoly Yakovenko wrote:

...
How would the program get updated values? via an IORef? This thing is running until the user decides the output looks good

Anatoly

On Thu, May 28, 2015 at 12:16 PM Carlos López-Camey wrote:

...
Cloud Haskell + Event streaming via some Protocol (like json on websockets) ?

2015-05-25 15:14 GMT-06:00 Anatoly Yakovenko :

...
I am playing around with some deep learning algorithms and I need a way to periodically read the intermediate result and change some of the system variables.

Any ideas on how to best approach this problem? I was thinking of something basic, like having the program periodically read and write from some files.

Thanks, Anatoly

_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/haskell-cafe

_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/haskell-cafe

Charlie Durham

10:22 p.m.

New subject: Any recommendations on how to interact with the running state of a program?

I think it entirely depends on how you plan to inject the new values into a running program. If you are doing iterations, then it might make sense to do an IOref that contains the entire space of values that may change and then atomically update the whole space when a config update happens. Or maybe you can put each update in a queue inside of an IORef and then do an atomic modify, or I see there is a package providing lockfree queues in hackage. Again, I think it more depends on how you are going about running your program, and where it makes sense to inject new values. Charlie On Thu, May 28, 2015 at 9:48 PM, Anatoly Yakovenko wrote:

...

Cool, thanks. But the ChangeHandler would still be modifying some mutable state that some other thread is referencing while it's running. That would still be via an IORef? I guess this is a similar problem as having a play/pause/skip controls to a video player. Is the interface between the "running" thread and the user triggered events an IORef? Or is there some other way to wrap that. Thanks, Anatoly

On Thu, May 28, 2015 at 6:32 PM Charlie Durham wrote:

...
Check out the configurator package: https://hackage.haskell.org/package/configurator

It has auto reloading of config files through the aptly named autoReload function. Pretty cool stuff.

Charlie

On Thu, May 28, 2015 at 9:21 PM, Anatoly Yakovenko
...
wrote:

...
How would the program get updated values? via an IORef? This thing is running until the user decides the output looks good

Anatoly

On Thu, May 28, 2015 at 12:16 PM Carlos López-Camey wrote:

...
Cloud Haskell + Event streaming via some Protocol (like json on websockets) ?

2015-05-25 15:14 GMT-06:00 Anatoly Yakovenko :

...
I am playing around with some deep learning algorithms and I need a way to periodically read the intermediate result and change some of the system variables.

Any ideas on how to best approach this problem? I was thinking of something basic, like having the program periodically read and write from some files.

Thanks, Anatoly

_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/haskell-cafe

_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/haskell-cafe

Sylvain Henry

29 May 29 May

5:03 a.m.

New subject: Any recommendations on how to interact with the running state of a program?

I would use STM to do that (i.e. put the system variables and the intermediate result in some TVars). Sylvain 2015-05-29 4:22 GMT+02:00 Charlie Durham :

...

I think it entirely depends on how you plan to inject the new values into a running program. If you are doing iterations, then it might make sense to do an IOref that contains the entire space of values that may change and then atomically update the whole space when a config update happens. Or maybe you can put each update in a queue inside of an IORef and then do an atomic modify, or I see there is a package providing lockfree queues in hackage. Again, I think it more depends on how you are going about running your program, and where it makes sense to inject new values.

Charlie

On Thu, May 28, 2015 at 9:48 PM, Anatoly Yakovenko wrote:

...
Cool, thanks. But the ChangeHandler would still be modifying some mutable state that some other thread is referencing while it's running. That would still be via an IORef? I guess this is a similar problem as having a play/pause/skip controls to a video player. Is the interface between the "running" thread and the user triggered events an IORef? Or is there some other way to wrap that. Thanks, Anatoly

On Thu, May 28, 2015 at 6:32 PM Charlie Durham wrote:

...
Check out the configurator package: https://hackage.haskell.org/package/configurator

It has auto reloading of config files through the aptly named autoReload function. Pretty cool stuff.

Charlie

On Thu, May 28, 2015 at 9:21 PM, Anatoly Yakovenko < aeyakovenko@gmail.com> wrote:

...
How would the program get updated values? via an IORef? This thing is running until the user decides the output looks good

Anatoly

On Thu, May 28, 2015 at 12:16 PM Carlos López-Camey wrote:

...
Cloud Haskell + Event streaming via some Protocol (like json on websockets) ?

2015-05-25 15:14 GMT-06:00 Anatoly Yakovenko :

...
I am playing around with some deep learning algorithms and I need a way to periodically read the intermediate result and change some of the system variables.

Any ideas on how to best approach this problem? I was thinking of something basic, like having the program periodically read and write from some files.

Thanks, Anatoly

_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/haskell-cafe

_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/haskell-cafe

_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://mail.haskell.org/cgi-bin/mailman/listinfo/haskell-cafe

3645

Age (days ago)

3645

Last active (days ago)

List overview

Download

4 comments

3 participants

participants (3)

Anatoly Yakovenko
Charlie Durham
Sylvain Henry