The Allinea DDT/MAP software supports a Reverse Connect feature. The GUI is installed and run locally, and information from the job running on the cluster is sent back to your laptop/workstation via SSH. This is the recommended way to use the software for interactive debugging/profiling of a job on HCC resources. Traditional X11 forwarding will also work, but is not recommended as the interface can be much slower to respond. In order to follow along with the demos, use these instructions to setup the Allinea client on your laptop.
First, download and install the remote client software for either Windows or OS X from this page. Alternatively, download the software directly for your OS: [OS X direct link] [Windows 64-bit direct link]
Start the Allinea software, and choose Configure… from the Remote Launch dropdown menu.
Click the Add button on the new window.
To setup a connection to Crane, fill in the fields as follows: Connection Name: Crane Host Name: <username>@crane.unl.edu Remote Installation Directory: /util/opt/allinea/18.2
It should appear similar to this:
Be sure to replace demo02 with your HCC username.
Click OK to close this dialog, and then Close on Configure Remote Connections to return back to the main Allinea window.
Next, log in to Crane. The Allinea software uses a
in your home directory to store configuration information. Since
is read-only from the nodes in the cluster, the directory will be
/work and symlink’d. To do so, run the following commands:
rm -rf $HOME/.allinea mkdir -p $WORK/.allinea ln -s $WORK/.allinea $HOME/.allinea
To test the connection, choose Crane from the Remote Launch menu.
A Connect to Remote Host dialog will appear and prompt for a password.
The login procedure is the same as for PuTTY or any other SSH program. Enter your HCC password followed by the Duo login. If the login was successful, you should see Connected to: <username>@crane.unl.edu in the lower right corner of the Allinea window.
The next step is to run a sample interactive job and test the Reverse Connect connection. Start an interactive job by running the following command.
srun --pty --qos=short bash
Once the job has started, load the allinea module and start DDT using
module load allinea ddt --connect
On your local machine, a pop-up box should appear prompting you to accept the Reverse Connect request.
Choose Accept. The Remote Launch section should change to indicate you are connected via tunnel, similar to:
Once that happens, Reverse Connect is working successfully and a debugging or profiling session can be started.
srun syntax is slightly different depending on which type of code
you are debugging. Use the following commands to start interactive jobs
for each type.
srun --pty --time=2:00:00 bash
srun --pty --time=2:00:00 --nodes=1 --ntasks-per-node=4 bash
srun --pty --time=2:00:00 --ntasks=4 bash
srun --pty --time=2:00:00 --partition=gpu --gres=gpu bash