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survival_guide [2020/05/26 15:06]
ccrosby [The user interface (not)] 		survival_guide [2022/02/01 18:38] (current)
alopis
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   - The computers that make up the HPC cluster do not run faster than a good desktop computer, nor do they usually have particularly impressive amounts of memory.  The performance comes from running many compute nodes in parallel.  If your application is not parallelised, it will not run faster at CHPC than on a good desktop machine.   - The computers that make up the HPC cluster do not run faster than a good desktop computer, nor do they usually have particularly impressive amounts of memory.  The performance comes from running many compute nodes in parallel.  If your application is not parallelised, it will not run faster at CHPC than on a good desktop machine.
   - The system is designed to be used in batch mode.  The user prepares a job, submits it to the queue, and the system executes it when the requested amount of resources become available.   - The system is designed to be used in batch mode.  The user prepares a job, submits it to the queue, and the system executes it when the requested amount of resources become available.
-  - You can request an interactive session, which will give you access to a compute node in the cluster.  Here you can compile programs, do pre- or post-processing, and check your job setup.+  - You can request an interactive session, which will give you access to a compute node in the cluster.  Here you can do quick tests or checks, compile programs, do pre- or post-processing, and check your job setup.
   - Access to the system is by means of secure-shell (ssh).   - Access to the system is by means of secure-shell (ssh).
   - Data can be copied to or from the system by means of secure copy (scp) or rsync.   - Data can be copied to or from the system by means of secure copy (scp) or rsync.
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 ===== The user interface (not) ===== ===== The user interface (not) =====
-Although personal computers running Linux have user interfaces that are very similar to Windows or Mac, the ssh-login to the HPC cluster runs in command line text mode only, by default using the Bash shell.  It is therefore essential to master a very small subset of Linux commands.  The internet has many excellent resources explaining how to perform tasks in Linux and Bash.  Nevertheless, here is a very short summary of the most useful instructions:+Although personal computers running Linux have user interfaces that are very similar to Windows or Mac, the ssh-login to the HPC cluster runs in command line text mode only, by default using the Bash shell.  It is therefore essential to master a very small subset of Linux commands.  **PLEASE be aware that there is NO undelete.  If you delete a file from the command line, it is gone, finish, klaar, kaput, never to be seen again.**  The internet has many excellent resources explaining how to perform tasks in Linux and Bash.  Nevertheless, here is a very short summary of the most useful instructions:
   * **ls** - provide a list of the files in the current directory   * **ls** - provide a list of the files in the current directory
-  * **ls** -l - provide a more detailed listing of the files in the current directory+  * **ls -l** - provide a more detailed listing of the files in the current directory
   * **pwd** - gives the current directory path (Present Working Directory)   * **pwd** - gives the current directory path (Present Working Directory)
   * **mkdir** - create a new directory   * **mkdir** - create a new directory
   * **cd** - change to a new directory   * **cd** - change to a new directory
 +  * **cp** - copy a file (remember to specify the file **and** the location to copy it to)
 +  * **mv** - move a file (either rename it or cut/paste it into a directory).
   * **rmdir** - remove a directory   * **rmdir** - remove a directory
   * **rm** - remove a file   * **rm** - remove a file
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 Here are examples of the most common module operations that you will need to use on the cluster: Here are examples of the most common module operations that you will need to use on the cluster:
   * **module avail** - To list all available packages   * **module avail** - To list all available packages
 +  * **module avail 2>&1 | grep //searchterm// ** will search through the modules for one containing the expression ''searchterm''.  Use the appropriate name of the software here.
   * **module avail chpc** - List just the chpc modules group - this contains most of the useful modules   * **module avail chpc** - List just the chpc modules group - this contains most of the useful modules
   * **module avail chpc/earth** - This will list all the applications and libraries in the "earth" subgroup (reserved for earth-science applications).   * **module avail chpc/earth** - This will list all the applications and libraries in the "earth" subgroup (reserved for earth-science applications).
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   * **module load chpc/python/3.5.2_gcc-6.2.0** - An alternative to module add (in this case, loading python version 3.5.2, compiled with gcc-6.2.0)   * **module load chpc/python/3.5.2_gcc-6.2.0** - An alternative to module add (in this case, loading python version 3.5.2, compiled with gcc-6.2.0)
   * **module list** - To list all the modules which you have already loaded in this session   * **module list** - To list all the modules which you have already loaded in this session
-  * **module dell gcc/6.1.0** - To unload a module (in this case gcc version 6.1.0+  * **module unload gcc/6.1.0** - To unload a module (in this case gcc version 6.1.0
   * **module purge** - to unload all modules that you have loaded   * **module purge** - to unload all modules that you have loaded
  
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 For GCC and the Intel compilers, however, you will have to load the modules that you wish to link your code against separately. For GCC and the Intel compilers, however, you will have to load the modules that you wish to link your code against separately.
  
-Finally, there are a few software packages (mostly those that are commercially licensed, such as Ansys/Fluent, but also a few open-source packages like OpenFOAM) which are installed on Lengau, but not available via the module system. To access these, look at their respective howto pages on this wiki.+Finally, there are a few software packages (mostly those that are commercially licensed, such as Ansys/Fluent, but also a few open-source packages like OpenFOAM) which are installed on Lengau, but not available via the module system. To access these, look at their respective [[howto:|howto]] pages on this wiki.
  
 ==== Installing New Software on Lengau ==== ==== Installing New Software on Lengau ====
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