Tool to measure ssh latency ("sshping") ?

[Roland Mainz]

On Thu, Jul 27, 2023 at 11:28 PM Michael Loftis <mloftis at wgops.com> wrote:
> On Thu, Jul 27, 2023 at 3:23 PM Roland Mainz <roland.mainz at nrubsig.org> wrote:
> > Before I start writing one myself...
> > ... did anyone ever wrote a tool to measure the latency of a ssh
> > connection, a la "ping" ?
>
> That gets...really complicated... Because what exactly do you want to
> measure?

We want to profile some kind of ancient self-made RPC system, and
therefore we need to measure the time starting from writing a string
into ssh stdin, get on the remote side /bin/cat to send it back, and
then stop the clock when the string comes out of ssh's stdout. And
that in a form of endless loop, for around one hour (just to be sure
that the overhead of the ssh protocol negotiation details and network
noise don't ruin the measurements...).

Or short: Round-trip latency of data passed to a remote /bin/cat. And
that for every possible ssh -c cipher

----

Bye,
Roland
-- 
  __ .  . __
 (o.\ \/ /.o) roland.mainz at nrubsig.org
  \__\/\/__/  MPEG specialist, C&&JAVA&&Sun&&Unix programmer
  /O /==\ O\  TEL +49 641 3992797
 (;O/ \/ \O;)