Thanks for quick reply.
Answers to your questions below. I hope it gives some clue. Please let me know
what else I can try.
What version of x2goagent resp. nxagent are you using? dpkg -l nx-libs?
dpkg -l nx-libs: no packages found <--- this seems strange?
x2goserver-x2goagent 4.1.0.3-0~1708~ubuntu1 amd64
nxagent 2:3.5.99.20-0~20190425 amd64
Can you please run xrestop within such a session and check if there are numbers
that are far away from those of a fresh session?
Nothing out of the ordinary there I think. No processes with high
memory usage.
You probably cannot answer that due to your usage scenario, but
anyway: does this also happen when you do not disconnect/reconnect?
I'll try to think of a way to test this.
What are you running inside the session?
No real pattern here for good and bad sessions. Matlab, Python/machine
learning stuff, NVIDIA CUDA-accelerated machine learning programs etc.
—
Johannes Töger
Associate Senior Lecturer
Cardiac MR Group
Department of Clinical Sciences Lund, Clinical Physiology
Lund University, Sweden
-----Original Message-----
From: Ulrich Sibiller <[email protected]>
Sent: Friday, January 17, 2020 13:25
To: Johannes Töger <[email protected]>
Cc: [email protected]
Subject: Re: [X2Go-User] Long-running x2goagent, high memory usage
On Fri, Jan 17, 2020 at 11:56 AM Johannes Töger <[email protected]>
wrote:
> We are using x2go for a common compute server at our department. We have
> users both on the local LAN and connections to the other side of Europe that
> work really well. Being able to close the client and have computations still
> running in a GUI environment is great.
>
> However, I think we have encountered a bug. Some (but not all) of the
> long-running x2goagent processes start taking a lot of memory, ~30 GB. This
> adds up quickly so that the other users can’t do their work. Below you can
> see how user3 and user7 have x2goagent processes with large memory use (RSS
> column).
>
> How can I go about debugging this? I have quite a bit of Linux experience,
> but I don’t know where to start on this one since I don’t know much about how
> x2go works internally.
>
> Server is on Ubuntu Server 18.04.1 LTS, (x2goserver
> 4.1.0.3-0~1708~ubuntu18.04.1). Clients are on Windows 10, version. 4.1.2.0.
>
> johannes@compute-server:~$ ps -o pid,lstart,rss,user $(pgrep
> x2goagent)
What version of x2goagent resp. nxagent are you using? dpkg -l nx-libs?
Can you please run xrestop within such a session and check if there are numbers
that are far away from those of a fresh session?
You probably cannot answer that due to your usage scenario, but
anyway: does this also happen when you do not disconnect/reconnect?
What are you running inside the session?
You could run x2goagent with valgrind to identify memory leaks but I am unsure
if that is working on a stock installation ( I don't do the packaging for
Debian/Ubuntu so I don't know if the deliveres binaries allow for decent
analysis/output). I'll check that this weekend.
Uli
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