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Benoit Chesneau-2

slave feature

i’m looking for some usage examples of the slave feature apart for its use in tests? what was the original purpose?

Benoît

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Brujo Benavides-3

Re: slave feature

Most likely not what you were looking for, but it’s used in gold_fever :)

Brujo Benavides

On Sep 22, 2017, at 12:00, Benoit Chesneau <[hidden email]> wrote:

i’m looking for some usage examples of the slave feature apart for its use in tests? what was the original purpose?

Benoît
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Max Lapshin-2

Re: slave feature

We are running code that works with ffmpeg in nif in separate process. It is a protection from a code that works in nif.

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Paul Fisher

Re: slave feature

In reply to this post by Benoit Chesneau-2

We use it to start separate vms, which are set with different OS priorities, and then schedule work to run in the appropriate one. Basically letting the OS deal with prioritization of different CPU heavy workloads.

paul

Fellow, Engineering

From: [hidden email] <[hidden email]> on behalf of Benoit Chesneau <[hidden email]>
Sent: Friday, September 22, 2017 10:00:48 AM
To: [hidden email]
Subject: [erlang-questions] slave feature

i’m looking for some usage examples of the slave feature apart for its use in tests? what was the original purpose?

Benoît

Confidentiality Notice | This email and any included attachments may be privileged, confidential and/or otherwise protected from disclosure. Access to this email by anyone other than the intended recipient is unauthorized. If you believe you have received this email in error, please contact the sender immediately and delete all copies. If you are not the intended recipient, you are notified that disclosing, copying, distributing or taking any action in reliance on the contents of this information is strictly prohibited.
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Stanislaw Klekot

Re: slave feature

In reply to this post by Max Lapshin-2

On Fri, Sep 22, 2017 at 06:55:20PM +0300, Max Lapshin wrote:
> We are running code that works with ffmpeg in nif in separate process. It
> is a protection from a code that works in nif.

Oh, look, and I'm spawning FFmpegs as ports, and wanting to kill them is
one of the reasons I'm writing a "my better subprocesses for Erlang"
application.

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Stanislaw Klekot
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Max Lapshin-2

Re: slave feature

We work with libavcodec, not libavformat and also we are working with nvidia, decklink and quicksync. All this stuff must be run in separate process*

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Michael Truog

Re: slave feature

In reply to this post by Benoit Chesneau-2

Paul Fisher

Re: slave feature

I should have clarified our use... we have a version of the slave module that is exactly the same except for that feature. We want to have each node handle its own IO directly to the system.

paul

Fellow, Engineering

From: [hidden email] <[hidden email]> on behalf of Michael Truog <[hidden email]>
Sent: Friday, September 22, 2017 12:26:23 PM
To: Benoit Chesneau; [hidden email]
Subject: Re: [erlang-questions] slave feature

On 09/22/2017 08:00 AM, Benoit Chesneau wrote:
> i’m looking for some usage examples of the slave feature apart for its use in tests? what was the original purpose?
>
>

You should be aware that nodes started with slave try to make the slave node use the master's filesystem automatically, though this doesn't work in all places (as shown in the bug https://urldefense.proofpoint.com/v2/url?u=https-3A__bugs.erlang.org_browse_ERL-2D446&d=DwIFEA&c=L_h2OePR2UWWefmqrezxOsP9Uqw55rRfX5bRtw9S4KY&r=PevFox_7LK44ZV_jlS5jRM2WItKtsHV4zN_CrbdT2aM&m=ZYaInvQKkF5t9wYb-bJCCzIq2vg5EMJ-yPQV5oGSzhE&s=6hwbTzX8VVRetMB-wwsC4dH_o0qsG_TWFYjhbCw7Hbs&e= which affects tsung). This behavior doesn't seem to be well documented (nor the -master command line argument used on the erl executable) but it appears to be the main deciding factor for whether slave is usable for a given situation (in addition to the linking that occurs between the master node, making the nodes not exist independently).

Best Regards,
Michael
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Benoit Chesneau-2

Re: slave feature

On 22 Sep 2017, at 19:35, Fisher, Paul <[hidden email]> wrote:

I should have clarified our use... we have a version of the slave module that is exactly the same except for that feature. We want to have each node handle its own IO directly to the system.

I would be interrested by such code!

--
paul
Fellow, Engineering
From: [hidden email] <[hidden email]> on behalf of Michael Truog <[hidden email]>
Sent: Friday, September 22, 2017 12:26:23 PM
To: Benoit Chesneau; [hidden email]
Subject: Re: [erlang-questions] slave feature

On 09/22/2017 08:00 AM, Benoit Chesneau wrote:
> i’m looking for some usage examples of the slave feature apart for its use in tests? what was the original purpose?
>
>

You should be aware that nodes started with slave try to make the slave node use the master's filesystem automatically, though this doesn't work in all places (as shown in the bug https://urldefense.proofpoint.com/v2/url?u=https-3A__bugs.erlang.org_browse_ERL-2D446&d=DwIFEA&c=L_h2OePR2UWWefmqrezxOsP9Uqw55rRfX5bRtw9S4KY&r=PevFox_7LK44ZV_jlS5jRM2WItKtsHV4zN_CrbdT2aM&m=ZYaInvQKkF5t9wYb-bJCCzIq2vg5EMJ-yPQV5oGSzhE&s=6hwbTzX8VVRetMB-wwsC4dH_o0qsG_TWFYjhbCw7Hbs&e= which affects tsung). This behavior doesn't seem to be well documented (nor the -master command line argument used on the erl executable) but it appears to be the main deciding factor for whether slave is usable for a given situation (in addition to the linking that occurs between the master node, making the nodes not exist independently).

Best Regards,
Michael
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