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Re: Running >10 jobs in parallel on the same remote machine


From: Ole Tange
Subject: Re: Running >10 jobs in parallel on the same remote machine
Date: Fri, 3 Aug 2012 17:52:31 +0200

On Fri, Aug 3, 2012 at 4:26 PM, Thomas Sattler
<address@hidden> wrote:
> May I suggest a different solution for the problem?
> How about the "Control" feature of (open-)ssh?

ControlPersist does not exist in my version of ssh. It is probably a
new option, and I am not too fond of depending on new versions.

Multiplexing using ControlMaster already exists (-M), but seems not to
fix the issue.

Can you test if ControlPersist works for this:

    seq 100 | parallel -j0 ssh server 'echo {};sleep 2'

Preferably you should not get:

    channel 21: open failed: administratively prohibited: open failed
    mux_client_request_session: session request failed: Session open
refused by peer
    ControlSocket ... already exists, disabling multiplexing

What I am proposing is something similar to:

    (seq 0.01 0.02 2; echo 0) | parallel -j0 'sleep {};ssh server echo
{};sleep 2'

(assuming it takes 0.1 second to login)


/Ole



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