Include Page

	PageMenuBegin
	PageMenuBegin

Table of Contents

Include Page
PageMenuEnd
PageMenuEnd

How do I keep programs running if a ssh connection fails

See if you can use the LSF batch nodes for your work. If not, three unix programs to help with this are tmux, nohup and screen. None of these programs will preserve a graphical program, or a X11 connection, so run your programs in terminal mode.

tmux

For example, with tmux, if one does

...

Psana

Topics specific to Psana

If you lose the connection to psanacs040, you can go back to that node and reattach:

ssh psexport
ssh psanacs040
tmux attach

You need to remember the node you ran tmux on. If you are running matlab, you can run the matlab license script with the --show-users parameter to see where you are running it:

/reg/common/package/scripts/matlic  --show-users

nohup

You could run a batch process with nohup (no hangup) as follows

    nohup myprogram

For example, suppose we want to run a Python script that prints to the screen and save its output (the below syntax is for the bash shell):

nohup python myscript.py > myoutput 2>&1 &

Here we are capturing the output of the program in myoutput, along with anything it writes to stderr (the 2>&1), then putting it in the background. The job will persist after you logout. You can take a look at the output in the file myoutput the next day. As with tmux you will need to remember the node you launched nohup on.

How do I run a LSF batch job?

Visit Submitting Batch Jobs, not this is for submitting batch jobs

Why did my batch job failed? I'm getting 'command not found'

Before running your script, make sure you can run something, for instance do

  bsub -q psnehq pwd

(substitute the appropriate queue for psnehq). If you created a script and are running

  bsub -q psnehq myscript

Then it maybe that the current directory is not in your path, run

  bsub -q psnehq ./myscript

Check that myscript is executable by yourself, check that you have the correct #! line to start the script.

Where is my epics variable?

Make sure it is a epics variable - it may be a control monitor variable. An easy way to see what is in the file is to use psana modules that dump data. For instance:

...

will almost always show what control variables are defined. It defaults to use the standard Source "ProcInfo()" for control data. It is possible (though very unlikely) for control data to come from a different source. One can use the EventKeys module to see all Source's present, and then specify the source for DumpControl through a config file.

How do I access data inside a Psana class?

Look for an example in the psana_examples package that dumps this class. There should be both a C++ and Python module that dumps data for the class.

How do I find out the experiment number (expNum) or experiment?

Psana stores both the experiment and expNum in the environment object - Env that Modules are passed, or that one obtains from the DataSource in interactive Psana. See Interactive Analysis document and the C++ reference for Psana::Env

Hdf5

Topics specific to hdf5

How do I write hdf5 files from C++ or Python

Python:

From Python we recommend h5py. For interactive Python, an example is found at Using h5py to Save Data.
For Python you can also use pytables. This is installed in the analysis release. Do

...

The Psana ddl based Translator can be used to write ndarrays, strings and a few simple types that C++ modules register. These will be organized in the same groups that we use to translate xtc to hdf5. Datasets with event times will be written as well. To use this, create a psana config file that turns off the translation of all xtc types but allows translation of ndarrays and strings. An example cfg file is here: psana_translate_noxtc.cfg You would just change the modules and files parameters for psana and the output_file parameter to Translator.H5Output. Load modules before the translator that put ndarrays into the event store. The Translator will pick them up and write them to the hdf5 file

Computing

Topics specific to computing