Project Overview:

Longhorn Project Overview

• Project Program:– NSF XD Vis

• Purpose:– Provide remote interactive visualization and data analysis services

to the national science community• Project Duration:

– August 1, 2009 – July 31, 2012• Partners and Roles:

– Kelly Gaither (TACC, PI)– Valerio Pascucci, Chuck Hansen (University of Utah, co-PI)– David Ebert (Purdue University, co-PI)– John Clyne (NCAR, co-PI)– Hank Childs (UC Davis/LBL, Software)– Linda Akli (SURA, MSI Outreach)

Longhorn Configuration:

LonghornFirst NSF XD Visualization Resource

• 256 Dell Dual Socket, Quad Core Intel Nehalem Nodes– 240 with 48 GB shared memory/node (6 GB/core)– 16 with 144 GB shared memory/node (18 GB/core)– 73 GB Local Disk– 2 Nvidia GPUs/Node (FX 5800 – 4GB RAM)

• ~14.5 TB aggregate memory• QDR InfiniBand Interconnect• Direct Connection to Ranger’s Lustre Parallel File

System• 10G Connection to 210 TB Local Lustre Parallel File

System• Jobs launched through SGE

256 Nodes, 2048 Cores, 512 GPUs, 14.5 TB Memory

Longhorn’s Lustre File System ($SCRATCH)

• OSS’s on Longhorn are built on Dell Nehalem Servers Connected to MD10000 Storage Vaults

• 15 Drives Total Configured into 2 Raid5 pairs with a Wandering Spare• Peak Throughput Speed of the File System is 5.86 GB/sec• Peak Aggregate Speed of the File System is 5.43 GB/sec

Longhorn Usage Modalities:

• Remote/Interactive Visualization– Highest priority jobs – Remote/Interactive capabilities facilitated through VNC– Run on 3 hour queue limit boundary

• GPGPU jobs– Run on a lower priority than the remote/interactive jobs– Run on a 12 hour queue limit boundary

• CPU jobs with higher memory requirements– Run on lowest priority when neither remote/interactive nor GPGPU

jobs are waiting in the queue– Run on a 12 hour queue limit boundary

Longhorn Queue Structure

Example: qsub -q normal -P vis

Software Available on Longhorn• Programming APIs: OpenGL, vtk (Not natively parallel)

– OpenGL – low level primitives, useful for programming at a relatively low level with respect to graphics

– VTK (Visualization Toolkit) – open source software system for 3D computer graphics, image processing, and visualization

– IDL

• Visualization Turnkey Systems – VisIt – free open source parallel visualization and graphical analysis

tool– ParaView – free open source general purpose parallel visualization

system– VAPOR – free flow visualization package developed out of NCAR– EnSight – commercial turnkey parallel visualization package targeted

at CFD visualization– Amira – commercial turnkey visualization package targeted at

visualizing scanned medical data (CAT scan, MRI, etc..)

Accessing Longhorn:

Connecting to Longhorn Using VNC

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ssh <user>@longhorn.tacc.utexas.edu qsub /share/sge/default/pe_scripts/job.vnctouch ~/vncserver.outtail –f ~/vncserver.out

contains vnc portinfo after job launches

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laptopor

workstation

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ssh –L <port>:longhorn.tacc.utexas.edu:<port> <user>@longhorn.tacc.utexas.edu

VNC server on vis node

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VNC server on vis node

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vncviewer localhost::<port> automaticport forwarding

to vis node

establishessecure tunnelto longhorn vnc port

localhost connection forwarded to longhorn via ssh tunnel

Without SSH Tunneling:

With SSH Tunneling:(1)

(2)

Longhorn Visualization Portalportal.longhorn.tacc.utexas.edu

• Developed to provide easy access to Longhorn and abstract away complexities involved with command line access

• Developed in conjunction with TeraGrid user portal and employs a fraction of TGUP developers to ensure continuity

• Used for all in-person Longhorn training

Longhorn Visualization Portalportal.longhorn.tacc.utexas.edu

• Specify type of session

• Specify resolution of vnc session

• Specify number of nodes needed and the wayness of the nodes

• Provides graphic of machine load

Longhorn Visualization Portalportal.longhorn.tacc.utexas.edu

• Vnc session opens up in java enabled browser

• Behaves as if user had gotten a remote desktop into Longhorn.

Longhorn Visualization Portalportal.longhorn.tacc.utexas.edu

3453 Jobs Submitted through Portal

All Vis Training on Longhorn Submits through the Longhorn Portal

8/2009 11/2009 2/2010 7/2010 8/2010 11/2010

Longhorn Documentation and Training:

Longhorn User Guides and Training Dates:

• http://services.tacc.utexas.edu/longhorn-user-guide

Training Statistics: 1/4/2010 – 12/31/2010

155 People Trained In Person

8/2009 11/2009 2/2010 7/2010 8/2010 11/2010

Longhorn Usage Statistics:

Usage on Longhorn: 1/4/2010 – 1/18/2011

• 526 active projects • 48,457 jobs run on the system• 5,456,155 SUs expended on the system

8/2009 11/2009 2/2010 7/2010 8/2010 11/2010 8/2009 11/2009 2/2010 7/2010 8/2010 11/2010

Usage by Job Type: 1/4/2010 – 1/18/2011

Numbers at Top Indicate Snapshot in Time