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For those who are new to web design, viewing a site's source code is one of the easiest ways to see how certain things are done so that you can learn from that work and start to use certain code or techniques in your own work. As any web designer working today, especially those who have been at it since the early days of the industry, and it's a safe bet that they with tell you they learned HTML simply by viewing the source of the web pages that they saw and were intrigued.
In addition to reading web design books or attending professional conferences, viewing a site's source code is a great way for beginners to learn HTML. There is likely to be multiple script files included, in fact, each one powering different aspects of the site. Frankly, a site's source code can seem overwhelming, especially if you are new to doing this. Don’t get frustrated if you can’t figure out what’s going on with that site immediately. Viewing the is just the first step in this process.
With a little experience, you will begin to better understand how all these pieces fit together to create the website that you see in your browser. As you get more familiar with the code, you will be able to learn more from it and it will not seem so daunting to you.
HPC Help Desk When to Contact the HPC Help DeskUsers should contact the HPC Help Desk when assistance isneeded for unclassified problems, issues, or questions.Hours of Operation8:00 a.m. Eastern, Monday - Friday (excluding Federalholidays).HPC Centers Home PageHelp Desk Video TutorialPhone Number1-877-222-2039 or (937) 255-0679Fax Number(937) 656-9538Help E-mailAccounts E-mailHPC Help Desk Manager E-mailAfter HoursCalls, e-mails and tickets received after normal operating hourswill be addressed the following business day.Mailing AddressDoD HPCMP HPC Help DeskAFRL/RCM2435 Fifth StreetWright-Patterson Air Force Base, OH - Ticket RequestsActive users may submit tickets from the.Inactive users may submit tickets using the. Scenario 1a: Serial Tasks on Crays with only aprunAprun can be used to launch scripts, not just executables. Itwill launch n instances of the script on the appropriate nodes,and the script can determine its own instance number by examining theenvironment variable $ALPSAPPPE.
Consider the followingbatch script.#PBS -l select=2:ncpus=32:mpiprocs=32.aprun -n 64 myscript.shThen, here is an example of myscript.sh that uses: #!/bin/shfilename=inputfile`printf%03d $ALPSAPPPE`# ^^^ note: filename is inputfile### where ### is file number starting at zero./ myexecutable $filenameThe result will be that 64 instances of myexecutable run across 2 nodes(assuming 32 cores each), each loading a separate file that ranges frominputfile000 to inputfile063. Scenario 1b: Serial Tasks on SGIs and IBMs with only Intel MPIThis works exactly the same as Scenario 1a. However, the differences are:. Swap out the SGI mpt module for Intel MPI, e.g.,module swap mpt intel-mpi-15 (on Thunder) SGI's mpt does notappear to support executing serial code. On IBM iDataPlexes with Intel MPI, if it is not the default, swapout the default MPI for Intel MPI. In the batch script, replace aprun with mpiexec.hydra.
Replace $ALPSAPPPE with $PMIRANK3. Scenario 2: Serial Tasks with Python and MPIThe Common Open Source Toolkit (COST), which is provided on all HPCMP systems,includes the mpi4py module. This should work on any system, and has beentested with aprun on Cray, mpiexecmpt on SGI,and mpiexec.hydra on IBM iDataPlex with Intel MPI. Considerthe following batch script for a Cray.#PBS -l select=2:ncpus=32:mpiprocs=32.module load costinit python mpi4py # Required for python & mpi (add other required python modules also)aprun -n 64 python myscript.pyThen the following python script, myscript.py: from mpi4py import MPIcomm=MPI.COMMWORLDfile='inputfile%03d'% (comm.rank)dosomethingwithafile(file)dosomethingwithafile could launch an external serial executable,do some processing on its own in Python, or a little of both. The advantage ofusing Python with MPI is that communication is possible, just like any MPI codein another language. More information is here. Scenario 3: Serial Tasks on Crays with CCMCray's provide Cluster Compatibility Mode (CCM), which setsup a series of nodes in a batch job without Cray's usual special environment.The advantage of this approach is maximum flexibility on how tasks are farmedout to nodes, and an environment that is similar to a traditional cluster.However, node selection and other setup must be handled manually.CCM is enabled with the PBS resource statement: -l ccm=1.The user uses ccmrun instead of aprun and can use ssh to access all nodesavailable to that running batch job.
The list of nodes is available in thenode file: $PBSNODEFILE. However, the node file is usuallynot visible from a compute node, so it must be copied before ccmrun (or passedto the compute nodes some other way).
Starting with the following batch scriptfor 2 nodes with 32 cores each.#PBS -l select=2:ncpus=32:mpiprocs=32#PBS -l ccm=1.cd $PBSOWORKDIR # go to where I'm working, which is where I was submittedcp $PBSNODEFILE./mynodefileccmrun myscript.sh 64 # run myscript.sh on 1st compute node and tell it to use 64 tasksThe script, myscript.sh will be launched on the 1st node ofthe requested nodes for the batch job, e.g.: #!/bin/shtasks=$1for (( i=0; i.