Compiling or Testing Code with an Interactive Job
The CHTC has two "build" machines configured for compiling code
interactively. Furthermore, any CHTC execute server can be used for
testing commands and programs before submitting large batches of
non-interactive jobs ('typical' jobs like our
Typically, any compilable code to be run in CHTC should be compiled
on our compiling servers.
(Note: If you are using a non-CHTC submit server to submit jobs to a
non-CHTC HTCondor Pool, you may have different capabilities for
submitting jobs interactively that are not covered here.)
- Creating Interactive Submit Files
- Submitting and Working Interactively
If you've already downloaded the source code for your program
Python-4.3.2.tar.gz file or
then you can skip this step and move to the next step.
If you haven't already downloaded your source code as a tarball, it's a
good idea to create one with all necessary code and compiling sources/libraries
you need, so that you don't have to list every file and/or
directory separately for "transfer_input_files" in the submit file.
For example, you could use something like the following command within a
directory where all of your needed files and directories are located:
[alice@submit]$ tar -czvf combined.tar.gz file1 file2 dir1 (etc.)
The above would produce a single file called "
that contains all other files and directories indicated at the end of the
2. Creating Interactive Submit Files
Create a file called interactive.sub (or any other
name you want), and paste in the below lines:
universe = vanilla
# Name the log file:
log = interactive.log
# Name the files where standard output and error should be saved:
output = process.out
error = process.err
# If you wish to compile code, you'll need the below lines.
# Otherwise, LEAVE THEM OUT if you just want to interactively test!
+IsBuildJob = true
requirements = (OpSysMajorVer =?= 6) && ( IsBuildSlot == true )
# Indicate all files that need to go into the interactive job session,
# including any tar files that you prepared:
transfer_input_files = combined.tar.gz, other_file.txt
# It's still important to request enough computing resources. The below
# values are a good starting point, but consider your file sizes for an
# estimate of "disk" and use any other information you might have
# for "memory" and/or "cpus".
request_cpus = 1
request_memory = 1GB
See the following points for areas that may need to be customized for your program.
A. Transfer Files
Modify the filename for
the example filenames (
to the name of your source tarball(s) and/or files. Note that this
submit file assumes that the source tarball is present in your
home directory on the submit server, in the same folder as this
interactive submit file.
B. Operating System
CHTC is currently running two different versions of Linux: Scientific
Linux 6 and CentOS 7.
The above submit file will select for our Scientific Linux 6
build machines by default. If your code needs
newer libraries or compilers that are present on CentOS 7 (our
newer Linux version), change the "OpSysMajorVer" listed in the
requirements line from 6 to 7.
requirements = (OpSysMajorVer =?= 7) && ( IsBuildSlot == true )
Note that code compiled on Scientific Linux 6
will typically run on both Scientific Linux 6 and CentOS 7 servers, but code
compiled on version 7 will likely not work on version 6.
If you choose to build on Linux 7, read the below information
By default, jobs in CHTC will run on both Scientific Linux 6 and CentOS 7. If you
compiled on CentOS 7, you should ensure that your jobs run only
on this operating system by adding a requirement to the submit file you use for
submitting your final jobs.
See our Operating System Transition guide,
section 3, for information about how to do this.
C. Other Files
Modify the filenames for
log per your preferences.
3. Submitting and Working Interactively
When you are ready to go, enter the
following with your correct submit file indicated instead:
[alice@submit]$ condor_submit -i interactive.sub
After several minutes (the time it takes for HTCondor to match new jobs
to available CHTC execute servers), an SSH connection will be
created to an execute server, and the relevant files will have been
transfered into the job working directory for you.
B. Working Interactively
Once the job starts, you are able to un-tar any tar files, compile programs,
and test commands as you please.
If you are following one of our other guides for building Python, R or Matlab, this
is where you should go follow those instructions for installing or compiling.
Typical un-tar command:
[alice@build]$ tar -xzvf combined.tar.gz
C. Output Files
HTCondor will ignore any sub-directories created during the course of the job, but
wil return any newly created files in the main directory. In order to return your
compiled code, typically you will want to make a new tarball of files you
want copied back to the submit server, and delete everything else that you don't want.
To exit as you would for any SSH shell, type
interactive job will be terminated, and you will return to the
location on the submit node from which you submitted the interactive
job. Any new files (your new tarball) will have been copied back to