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1 Before We Start Sign in hpcxx account slips Windows Users: Download PuTTY Google PuTTY First result Save putty.exe to Desktop

2 Research Computing at Virginia Tech Advanced Research Computing

3 Compute Resources

4 Blue Ridge Computing Cluster Resources for running jobs 408 dual-socket nodes with 16 cores/node Intel Sandy Bridge-EP Xeon (8 cores) in each socket 4 GB/core, 64 GB/node total: 6,528 cores, 27.3 TB memory Special nodes: 130 nodes with 2 Intel Xeon Phi accelerators 18 nodes with 128 GB 4 nodes with 2 Nvidia K40 GPUs Quad-data-rate (QDR) InfiniBand

5 HokieSpeed CPU/GPU Cluster 206 nodes, each with: Two 6-core 2.40-gigahertz Intel Xeon E5645 CPUs and 24 GB of RAM Two NVIDIA M2050 Fermi GPUs (448 cores/socket) Total: 2,472 CPU cores, 412 GPUs, 5 TB of RAM Top500 #221, Green500 #43 (November 2012) 14-foot by 4-foot 3D visualization wall Recommended Uses: Large-scale GPU computing Visualization

6 HokieOne - SGI UV SMP System 492 Intel Xeon 7542 (2.66GHz) cores Sockets: Six-core Intel Xeon X7542 (Westmere) 41 dual-socket blades for computation One blade for system + login 2.6TB of Shared Memory (NUMA) 64 GB/blade, blades connected with NUMAlink Resources scheduled by blade (6 cores, 32 GB) Recommended Uses: Memory-heavy applications (up to 1 TB) Shared-memory (e.g. OpenMP) applications

7 Ithaca IBM idataplex 84 dual-socket quad-core Intel Nehalem 2.26 GHz nodes (672 cores in all) 66 nodes available for general use Memory (2 TB Total): 56 nodes have 24 GB (3 GB/core) 10 nodes have 48 GB (6 GB/core) Quad-data-rate (QDR) InfiniBand Operating System: CentOS 6 Recommended uses: Parallel Matlab (28 nodes/224 cores) Beginning users

8 Storage Resources

9 Name Intent File System Environment Variable Per User Maximum Data Lifespan Available On Home Long-term storage of files NFS $HOME 100 GB Unlimited Login and Compute Nodes Work Fast I/O, Temporary storage Lustre (BlueRidge) GPFS (Other clusters) $WORK 14 TB, 3 million files 120 days Login and Compute Nodes Archive Long-term storage for infrequentlyaccessed files CXFS $ARCHIVE - Unlimited Login Nodes Local Scratch Local disk (hard drives) $TMPDIR Size of node hard drive Length of Job Compute Nodes Memory (tmpfs) Very fast I/O Memory (RAM) $TMPFS Size of node memory Length of Job Compute Nodes Old Home Access to legacy files NFS - Read-only TBD Login Nodes

10 GETTING STARTED ON ARC S SYSTEMS

11 Getting Started Steps 1. Apply for an account 2. Log in (SSH) into the system 3. System examples a. Compile b. Test (interactive job) c. Submit to scheduler 4. Compile and submit your own programs

12 ARC Accounts 1. Review ARC s system specifications and choose the right system(s) for you a. Specialty software 2. Apply for an account online 3. When your account is ready, you will receive confirmation from ARC s system administrators within a few days

13 Log In Log in via SSH Mac/Linux have built-in client Windows need to download client (e.g. PuTTY) System BlueRidge HokieSpeed HokieOne Ithaca Login Address (xxx.arc.vt.edu) blueridge1 or blueridge2 hokiespeed1 or hokiespeed2 hokieone ithaca1 or ithaca2

14 BLUERIDGE ALLOCATION SYSTEM

15 Blue Ridge Allocation System Goals of the allocation system: Ensure that the needs of computational intensive research projects are met Document hardware and software requirements for individual research groups Facilitate tracking of research

16 Allocation Eligibility To qualify for an allocation, you must meet at least one of the following: Be a Ph.D. level researcher (post-docs qualify) Be an employee of Virginia Tech and the PI for research computing Be an employee of Virginia Tech and the co-pi for a research project led by non-vt PI

17 Allocation Application Process 1. Create a research project in ARC database 2. Add grants and publications associated with project 3. Create an allocation request using the webbased interface 4. Allocation review may take several days 5. Users may be added to run jobs against your allocation once it has been approved

18 Allocation Tiers Research allocations fall into three tiers: Less than 200,000 system units (SUs) 200 word abstract 200,000 to 1 million SUs 1-2 page justification More than 1 million SUs 3-5 page justification

19 Allocation Management Users can be added to the project: glsaccount: Allocation name and membership gbalance -h -a <name>: Allocation size and amount remaining gstatement -h -a <name>: Usage (by job)

20 USER ENVIRONMENT

21 Environment Consistent user environment in systems Using modules environment Hierarchical module tree for system tools and applications

22 Modules Modules are used to set the PATH and other environment variables Modules provide the environment for building and running applications Multiple compiler vendors (Intel vs GCC) and versions Multiple software stacks: MPI implementations and versions Multiple applications and their versions An application is built with a certain compiler and a certain software stack (MPI, CUDA) Modules for software stack, compiler, applications User loads the modules associated with an application, compiler, or software stack modules can be loaded in job scripts

23 Modules Modules are used to set up your PATH and other environment variables % module {lists options} % module list {lists loaded modules} % module avail {lists available modules} % module load <module> {add a module} % module unload <module> {remove a module} % module swap <mod1> <mod2> {swap two modules} % module help <mod1> {module-specific help}

24 Module commands module list options module list list loaded modules module avail list available modules module load <module> add a module module unload <module> remove a module module swap <mod1> <mod2> swap two modules module help <module> module environment module show <module> module description module reset reset to default module purge unload all module

25 Modules Available modules depend on: The compiler (eg. Intel, gcc) and The MPI stack selected Defaults: BlueRidge: Intel + mvapich2 HokieOne: Intel + MPT HokieSpeed, Ithaca: Intel + OpenMPI

26 Hierarchical Module Structure

27 Modules module purge module load <compiler> module load <mpi stack> module load <high level software, i.e. PETSc> The default modules are provided for minimum functionality. Module dependencies against choice of compiler and MPI stack are automatically taken care of.

28 JOB SUBMISSION & MONITORING

29 Job Submission Submission via a shell script Job description: Nodes, processes, run time Modules & dependencies Execution statements Submit job script via the qsub command: qsub <job_script>

30 Queue: Job script waits for resources. Master: Compute node that executes the job script, launches all MPI processes. Batch Submission Process

31 Job Monitoring Determine job status, and if pending when it will run Command checkjob v JOBID qstat f JOBID showstart JOBID qdel JOBID mdiag -n Meaning Get the status and resource of a job Get status of a job Get expected job start time Delete a job Show status of cluster nodes

32 Job Execution Order of job execution depends on a variety of parameters: Submission Time Queue Priority Backfill Opportunities Fairshare Priority Advanced Reservations Number of Actively Scheduled Jobs per User

33 Examples: ARC Website See the Examples section of each system page for sample submission scripts and step-by-step examples:

34 Getting Started Find your training account (hpcxx) Log into BlueRidge Mac: ssh Windows: Use PuTTY Host Name: ithaca2.arc.vt.edu

35 Example: Running MPI_Quad Source file: edu/resources/software/mpi/docs/mpi_quad.c Copy the file to Ithaca wget command Could also use scp or sftp Build the code

36 Compile the Code Intel compiler is already loaded module list Compile command (executable is mpiqd) mpicc -o mpiqd mpi_quad.c To use GCC instead, swap it out: module swap intel gcc

37 Prepare Submission Script 1. Copy sample script: cp /home/training/arc_intro/it.qsub. 2. Edit sample script: a. Walltime b. Resource request (nodes/ppn) c. Module commands (add Intel & mvapich2) d. Command to run your job 3. Save it (e.g., mpiqd.qsub)

38 #!/bin/bash Submission Script (Typical) #PBS -l walltime=00:10:00 #PBS -l nodes=2:ppn=8 #PBS -q normal_q #PBS -W group_list=ithaca #PBS A AllocationName <--Only for BlueRidge module load intel mvapich2 cd $PBS_O_WORKDIR echo "MPI Quadrature!" mpirun -np $PBS_NP./mpiqd exit;

39 Submission Script (Today) #!/bin/bash #PBS -l walltime=00:10:00 #PBS -l nodes=2:ppn=8 #PBS -q normal_q #PBS -W group_list=training #PBS A training #PBS l advres=nli_arc_intro.8 module load intel mvapich2 cd $PBS_O_WORKDIR echo "MPI Quadrature!" mpirun -np $PBS_NP./mpiqd exit;

40 Submit the job 1. Copy the files to $WORK: cp mpiqd $WORK cp mpiqd.qsub $WORK 2. Navigate to $WORK cd $WORK 3. Submit the job: qsub mpiqd.qsub 4. Scheduler returns job number: master.cluster

41 Wait for job to complete 1. Check job status: qstat f or qstat u hpcxx checkjob v When complete: 1. Job output: mpiqd.qsub.o Errors: mpiqd.qsub.e Copy results back to $HOME: cp mpiqd.qsub.o25770 $HOME

42 Resources ARC Website: ARC Compute Resources & Documentation: New Users Guide: edu/userinfo/newusers.php Frequently Asked Questions: vt.edu/userinfo/faq.php Unix Introduction: edu/resources/software/unix/

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