Guacamole RDP shared connection load

[Vladimir Sorokin <vo...@strigo.io>]

Hi,
We encountered performance issues for shared RDP connection with 150+ users
on the same connection.
We have a custom guacamole application that consists of multiple docker
glyptodon/guacd:2.8.1 (we intend to align and use latest
guacamole/guacd:1.4), multiple guacamole-common:1.4 proxy servers, and
guacamole-client:1.2.
We have a scenario with a shared RDP connection, where only one user
(presenter) has write privileges and others only read only.
We've been using this setup for years without a problem with shared
connections with up to 100 users, and only recently have we encountered
performance problems for shared connection with 150+ users.
We monitored the underlying AWS ec2 machines' resource usage (CPU, memory,
network), and it does not appear that the resource usage is out of the
baseline, so it does not look like the problem originates in the resource
usage.
On the shared connection, the user with the write privileges presents some
desktop application, nothing graphical, CPU, or network heavy. The network
connection for the presenter seems stable.
And yet, the presenter experiences significant lag on every action -
clicks, cursor movement, etc.
Could there be a performance limit for the maximum number of users per
shared connection?
We intend to execute a load test to confirm, but maybe there are other
directions that we should look at?

Thanks

-- 
Vladimir Sorokin
Developer
+972 54 723 6151

Re: Guacamole RDP shared connection load

[Vladimir Sorokin <vo...@strigo.io>]

Hi Mike, probably so, but due to large amount of participants can't confirm
it.
Is there a way to identify this slowdown to confirm the theory?
Is there a way to avoid slowdown, like setting the baseline for the
performance for the shared connection?
Or is there a way to identify a slow client, so maybe we'll be able to drop
it in favor of performance for the majority?


On Thu, 9 Feb 2023, 21:08 Michael Jumper, <mj...@apache.org> wrote:

> Did anyone on the connection have a very slow network connection? The
> server may have needed to reduce its responsiveness to avoid streaming far
> more data than that user would be able to receive and process in the same
> amount of time it took the server to generate that data.
>
> Network latency shouldn't be an issue, as the Guacamole server is capable
> of distinguishing between client slowness due to network speed vs. network
> latency, and makes constant adjustments accordingly.
>
> There should not be any appreciable increase in processing load for shared
> connections, as shared connections in Guacamole work by sending the same
> data to all users of the connection. The more intensive part of the
> processing involved in a connection, graphical operations and compression,
> are performed only once.
>
> If the presenter was experiencing slowness in the movement of the local
> mouse cursor, that suggests an issue with the local machine and not the
> shared connection. The mouse cursor is rendered locally, with few
> exceptions.
>
> - Mike
>
> On Thu, Feb 9, 2023, 4:33 AM Vladimir Sorokin <vo...@strigo.io> wrote:
>
>> Hi,
>> We encountered performance issues for shared RDP connection with 150+
>> users on the same connection.
>> We have a custom guacamole application that consists of multiple docker
>> glyptodon/guacd:2.8.1 (we intend to align and use latest
>> guacamole/guacd:1.4), multiple guacamole-common:1.4 proxy servers, and
>> guacamole-client:1.2.
>> We have a scenario with a shared RDP connection, where only one user
>> (presenter) has write privileges and others only read only.
>> We've been using this setup for years without a problem with shared
>> connections with up to 100 users, and only recently have we encountered
>> performance problems for shared connection with 150+ users.
>> We monitored the underlying AWS ec2 machines' resource usage (CPU,
>> memory, network), and it does not appear that the resource usage is out of
>> the baseline, so it does not look like the problem originates in the
>> resource usage.
>> On the shared connection, the user with the write privileges presents
>> some desktop application, nothing graphical, CPU, or network heavy. The
>> network connection for the presenter seems stable.
>> And yet, the presenter experiences significant lag on every action -
>> clicks, cursor movement, etc.
>> Could there be a performance limit for the maximum number of users per
>> shared connection?
>> We intend to execute a load test to confirm, but maybe there are other
>> directions that we should look at?
>>
>> Thanks
>>
>> --
>> Vladimir Sorokin
>> Developer
>> +972 54 723 6151
>>
>

Re: Guacamole RDP shared connection load

[Michael Jumper <mj...@apache.org>]

Did anyone on the connection have a very slow network connection? The
server may have needed to reduce its responsiveness to avoid streaming far
more data than that user would be able to receive and process in the same
amount of time it took the server to generate that data.

Network latency shouldn't be an issue, as the Guacamole server is capable
of distinguishing between client slowness due to network speed vs. network
latency, and makes constant adjustments accordingly.

There should not be any appreciable increase in processing load for shared
connections, as shared connections in Guacamole work by sending the same
data to all users of the connection. The more intensive part of the
processing involved in a connection, graphical operations and compression,
are performed only once.

If the presenter was experiencing slowness in the movement of the local
mouse cursor, that suggests an issue with the local machine and not the
shared connection. The mouse cursor is rendered locally, with few
exceptions.

- Mike

On Thu, Feb 9, 2023, 4:33 AM Vladimir Sorokin <vo...@strigo.io> wrote:

> Hi,
> We encountered performance issues for shared RDP connection with 150+
> users on the same connection.
> We have a custom guacamole application that consists of multiple docker
> glyptodon/guacd:2.8.1 (we intend to align and use latest
> guacamole/guacd:1.4), multiple guacamole-common:1.4 proxy servers, and
> guacamole-client:1.2.
> We have a scenario with a shared RDP connection, where only one user
> (presenter) has write privileges and others only read only.
> We've been using this setup for years without a problem with shared
> connections with up to 100 users, and only recently have we encountered
> performance problems for shared connection with 150+ users.
> We monitored the underlying AWS ec2 machines' resource usage (CPU, memory,
> network), and it does not appear that the resource usage is out of the
> baseline, so it does not look like the problem originates in the resource
> usage.
> On the shared connection, the user with the write privileges presents some
> desktop application, nothing graphical, CPU, or network heavy. The network
> connection for the presenter seems stable.
> And yet, the presenter experiences significant lag on every action -
> clicks, cursor movement, etc.
> Could there be a performance limit for the maximum number of users per
> shared connection?
> We intend to execute a load test to confirm, but maybe there are other
> directions that we should look at?
>
> Thanks
>
> --
> Vladimir Sorokin
> Developer
> +972 54 723 6151
>