do you want parallel file operations?

[François Bérenger]

I have this one currently:

let parmap_on_file (ncores: int) (fn: string) (f: 'a -> 'b) (read_one: in_channel -> 'a): 'b list = ...

[François Bérenger]

Or, I wonder if I should create a separate library depending on parmap ...

[François Bérenger]

I will create a separate library if I gather enough interesting primitives.

[Roberto Di Cosmo]

If the new functions just use the parmap library and do not require modifications to the parmap code, you can definitely create a separate library on top of parmap. If you find functions that are general enough that inclusion in parmap seems the best way to go, just create another PR and we can discuss that. 2017-02-24 10:35 GMT-08:00 Francois BERENGER <[e-mail]>:

…

I will create a separate library if I gather enough interesting primitives. — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#58 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AAp-vxRSNzHFAyI5QMm7kNdktlrox4KZks5rfyLggaJpZM4MLhzt> .

-- Roberto Di Cosmo

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[François Bérenger]

I think such a function is quite useful. I'd like to contribute it to parmap.
Here is the current signature:

let parmap_on_file
    (ncores: int)
    (fn: filename)
    (f: 'a -> 'b)
    (read_one: in_channel -> 'a): 'b list

If deemed useful, we can probably add later friend functions such as pariter_on_file,
parmap_fold_on_file, etc.

Let me know if you have a better interface to propose.

This is the second time I need such a functionality in a project, so I guess it can be quite
useful to other parmap users as well.
I do chemoinformatics, but I guess bioinformatics people might have such needs as well.

Regards,
Francois.

[François Bérenger]

@smondet @agarwal

[Ashish Agarwal]

I haven't been using parmap in a while, so my opinion not useful at this time.

[Seb Mondet]

@UnixJunkie that sounds useful when we want to have only ncores items at once in memory.
A more general version would use any stream-like input: unit -> 'a option.

PS: I haven't done any "analysis-level" bioinformatics in a long while though :)

[François Bérenger]

@smondet Is the option just used to send the end of file info via a None?

[François Bérenger]

Maybe the most generic construct is:
let parallelize
(ncores: int)
(demux: () -> 'a)
(work: 'a -> 'b)
(mux: 'b -> ()): ()
but then that's so generic that it should reside out of parmap.

[Seb Mondet]

@UnixJunkie Yes, "End of Stream" actually 👍

[François Bérenger]

parany can be used for that