Re: rbssh *really* slow

[Christian Hammond]

Hi,

Just an FYI, we don't support this configuration in any way. For a variety
of reasons, Review Board expects to use our rbssh, and not OpenSSH. If
things are unusually slow, that's worth investigating (I'd need to see
logs), but if anyone wants to go this route, just don't be surprised if
other problems manifest.

Christian

-- 
Christian Hammond - chip...@chipx86.com
Review Board - https://www.reviewboard.org
Beanbag, Inc. - https://www.beanbaginc.com

On Wed, Oct 14, 2015 at 9:37 AM,  wrote:

> Replace the contents of /usr/bin/rbssh with the following:
>
>
> #!/bin/sh
> EXTRA_OPTS="-o UserKnownHostsFile=$HOME/.ssh/known_hosts -o ForwardX11=no
> -o LogLevel=ERROR"
> # see https://en.wikibooks.org/wiki/OpenSSH/Cookbook/Multiplexing
> EXTRA_OPTS="-o ControlPath=/tmp/master-%r@%h:%p -o ControlMaster=auto -o
> ControlPersist=10m $EXTRA_OPTS"
> for k in $HOME/.ssh/id_{dsa,rsa} ; do
>   test -e "$k" && EXTRA_OPTS="$EXTRA_OPTS -i $k"
> done
> exec /usr/bin/ssh $EXTRA_OPTS "$@"
>
>
> Using native ssh was about 5x faster than the default Python rbssh
> implementation.  Moreover, using the connection multiplexing feature of ssh
> further sped up things another 5x or so.
>
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> Supercharge your Review Board with Power Pack:
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Re: rbssh *really* slow

[vlad . romascanu]

Replace the contents of /usr/bin/rbssh with the following:


#!/bin/sh
EXTRA_OPTS="-o UserKnownHostsFile=$HOME/.ssh/known_hosts -o ForwardX11=no 
-o LogLevel=ERROR"
# see https://en.wikibooks.org/wiki/OpenSSH/Cookbook/Multiplexing
EXTRA_OPTS="-o ControlPath=/tmp/master-%r@%h:%p -o ControlMaster=auto -o 
ControlPersist=10m $EXTRA_OPTS"
for k in $HOME/.ssh/id_{dsa,rsa} ; do
  test -e "$k" && EXTRA_OPTS="$EXTRA_OPTS -i $k"
done
exec /usr/bin/ssh $EXTRA_OPTS "$@"


Using native ssh was about 5x faster than the default Python rbssh 
implementation.  Moreover, using the connection multiplexing feature of ssh 
further sped up things another 5x or so.

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rbssh *really* slow

[Alexandru Palade]

I had set up a ReviewBoard server with a subversion deployment via
svnserve and ssh. They are both on the same server. Everything is
working OK, minus the fact that is running incredibly slow. The VPS
I'm running on is a cheap one, so I don't have big expectations from
it, but I encountered something strange.

Being on the server, I narrowed down where exactly it was slow.
Everytime rbssh is invoked, the operation gets slow. So I tried the
following:

ssh reviewboard@127.0.0.1 (runs under a second)
rbssh reviewboard@127.0.0.1 (runs in about 30s)

Looking at the stacktrace of rbssh, it appears that is stuck waiting
for the connection in the paramiko library. So it might be a paramiko
problem, rather than a rbssh problem, but I am just wondering if
anyone has any ideas why could it go so slow. The authentification is
made with keys.

Thank you for this great product,
Alex

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