Post on 29-Jan-2016
description
AdvancedScientific Visualization
Laboratory
Paul Navrátil
28 May 2009
Topics
• Remote and Collaborative Visualization
• Remote Visualization on Spur
• Scripted Visualization with VisIt
Old Model (No Remote Capability)
LocalVisualization
Resource
LocalVisualization
Resource
HPCSystem
HPCSystem
DataArchive
DataArchive
Pix
els
Pix
els
Mou
se
Mou
se
DisplayDisplay
Remote SiteRemote SiteWide-AreaNetwork
Wide-AreaNetwork Local SiteLocal Site
New ModelRemote Capability
Large-ScaleVisualization
Resource
Large-ScaleVisualization
Resource
HPCSystem
HPCSystem
DataArchive
DataArchive
DisplayDisplay
Remote SiteRemote SiteWide-AreaNetwork
Wide-AreaNetwork Local SiteLocal Site
PixelsPixels
MouseMouse
New ModelMulti-User and Collaborative Capability
Large-ScaleVisualization
Resource
Large-ScaleVisualization
Resource
HPCSystem
HPCSystem
DataArchive
DataArchive
Wide-AreaNetwork
Wide-AreaNetwork Local Site BLocal Site B
PixelsPixels
Remote SiteRemote Site
MouseMouse
PixelsPixels
MouseMouse
Display ADisplay A
Display BDisplay B
Local Site ALocal Site A
Spur - Visualization System
• 128 cores, 1 TB distributed memory, 32 GPUs
• spur.tacc.utexas.edulogin node, no GPUsdon’t run apps here!
• ivisbig.ranger Sun Fire X4600 server
– 8 AMD Opteron dual-core CPUs @ 3 GHz
– 256 GB memory– 4 NVIDIA FX5600 GPUs
• ivis[1-7].rangerSun Fire X4440 server
– 4 AMD Opteron quad-core CPUs @ 2.3 GHz
– 128 GB memory– 4 NVIDIA FX5600 GPUs
Spur / Ranger topology
spurspur
login3.rangerlogin3.ranger
Login NodesLogin Nodes
login4.rangerlogin4.ranger
Compute NodesCompute Nodes
Vis nodesivis[1-7|big]
Vis nodesivis[1-7|big]
HPC nodesixxx-xxx
HPC nodesixxx-xxx
visqueuevis
queue
normaldevelopment
<etc>queues
normaldevelopment
<etc>queues
File SystemFile System
$HOME
$HOME
$WORK
$WORK
$SCRATCH
$SCRATCH
Topics
• Remote and Collaborative Visualization
• Remote Visualization on Spur
• Scripted Visualization with VisIt
Starting a Remote Vis Job on Spur(Lab Exercise)
Step 1: Download a vnc client, preferably with integrated compression
Recommended options:TightVNChttp://www.tightvnc.com/download.html
TurboVNChttp://www.virtualgl.org/Downloads/TurboVNC
Starting a Remote Vis Job on Spur(Lab Exercise)
Step 2: ssh <username>@spur.tacc.utexas.edu
Starting a Remote Vis Job on Spur(Lab Exercise)
Step 3: On Spur, set up your vnc password. This only needs to be done oncevnc password shared across Spur and Ranger
In your ssh, enter vncpasswd Select and verify password.
NOTE: vnc passwords are NOT secure!8 char limit (rest ignored)should NOT be your TACC passwordstored in ~/.vnc/passwd
Starting a Remote Vis Job on Spur(Lab Exercise)
Step 4: Launch a vncserver job using SGEqsub /share/sge/default/pe_scripts/job.vnctouch ~/vncserver.outtail –f ~/vncserver.out
qsub = sge submit command must specify account
job.vnc = job script make local copy to modify acct, runtime, # proc
Connection instructions written to ~/vncserver.out once job launches
Use visq to monitor job status
Starting a Remote Vis Job on Spur(Lab Exercise)
Step 5: Create ssh tunnel from your laptop to the vnc session ssh –f –N –L <port>:spur.tacc.utexas.edu:<port> <user>@spur.tacc.utexas.edu
vnc communication is unencryptedso create ssh tunnel between your laptop and spur login
<port> : port assigned by vnc job
<user> : your username on spur
Your vncviewer will connect to port on your laptop (localhost)
ssh tunnel forwards connection to port on spur (login node)
spur automatically forwards to port on vis node
-f port forward only, no command
-N background after connect
-L forward local <port> to remote machine:<port>
Starting a Remote Vis Job on Spur(Lab Exercise)
Step 6: Connect to that display by using a vnc client
(1)
(2)
(3)
Starting a Remote Visualization Job on Maverick (Lab Exercise)
Step 7: Type glxgearsA common error – extension GLX missing!
By default, your vnc session cannot access OpenGL or GPUs
Any OpenGL-based application will encounter this issue
Starting a Remote Visualization Job on Maverick (Lab Exercise)
Step 8: Type vglrun glxgearsAccesses GPUs and OpenGL libs via VirtualGL
VirtualGL captures framebuffer from GPU, forwards it to vnc session
Use vglrun –d to specify which GPU to use (–d :0.0 is default)
vglrun –d :0.0 <app>
vglrun –d :0.1 <app>
vglrun –d :0.2 <app>
vglrun –d :0.3 <app>
Starting a Remote Vis Job on Spur(Lab Exercise)
Step 9: Type ‘module avail’ in the xterm.
This will tell you which programs are available to load and run.
Some programs have module dependencies (e.g. many vis programs)
Some programs are compiler and/or MPI-stack dependent
Topics
• Remote and Collaborative Visualization
• Remote Visualization on Spur
• Scripted Visualization with VisIt
– Python Primer
– Create Image using Python Script
– Change View and Apply Operators
– Fly Around Dataset
One-Slide Intro to Python
def count_fingers(n):
if (n < 0):
print “How do you count negative fingers?!”
elif (n > 10):
print “I only have ten fingers!”
else:
for i in range(0,n):
print “%d little piggy” % (i + 1)
Inspecting VisIt Python Classes>>> s = SaveWindowAttributes()
>>> s
outputToCurrentDirectory = 0
outputDirectory = "C:\Documents and Settings\pnav\My Documents\VisIt 1.11.2\My images"
fileName = "visit"
family = 1
format = TIFF # BMP, CURVE, JPEG, OBJ, PNG, POSTSCRIPT, POVRAY, PPM, RGB, STL, TIFF, ULTRA, VTK
width = 1024
height = 1024
screenCapture = 0
saveTiled = 0
quality = 80
progressive = 0
binary = 0
stereo = 0
compression = PackBits # None, PackBits, Jpeg, Deflate
forceMerge = 0
resConstraint = ScreenProportions # NoConstraint, EqualWidthHeight, ScreenProportions
>>> s.format = s.PNG
>>> s.width, s.height = (1600, 1200)
>>> SetSaveWindowAttributes(s)
Basic VisIt Classes and Functions• OpenDatabase( “<Full Path to DB>” )• AddPlot( “<Plot Name>” )
pa = <Plot Name>Attributes()SetPlotOptions( pa )
• AddOperator( “<Operator Name>” )
oa = <Operator Name>Attributes()SetOperatorOptions( oa )
• DrawPlots()– once invoked, all commands that change plot will update plot automatically
• s = SaveWindowAttributes()SetSaveWindowAttributes( s )
• SaveWindow()• view = GetView3D()
SetView3D( view )• DeleteAllPlots()
Full Interface description at:https://wci.llnl.gov/codes/visit/1.4.1/PythonInterface1.4.1.pdf
Function to Change View Axis
def change_view(normal, up, nsteps=10, start=0):
c0 = GetView3D()
c1 = GetView3D()
c1.viewNormal = normal
c1.viewUp = up
cpts = (c0, c1)
x = (0., 1.)
for i in range(start, nsteps+1):
t = float(i) / float(nsteps)
c = EvalCubicSpline(t, x, cpts)
SetView3D(c)
# SaveWindow() # uncomment to save image of each step
Lab #1 – Create Isosurface Plot
• Open RectGrid2.vtk• Create Pseudocolor
plot on scalars variable
• Apply Isosurface operator
Lab #2 – Clip Isosurface Plot on -Y
• Rotate view from +Z axis to –Y axis
• Create Clip operator• Change Clip attributes
to change clip plane from +X axis to –Y axis
• Apply new clip attributes
Lab #3 – Save Image Stack
• Using change_view as a model, save an image stack of the view changing
• Bonus points: change filename and image file type
Lab #4 – Fly Around Plot
• Using change_view as a model, create multiple viewpoints to fly around dataset
• Bonus points: modulate viewpoints along wave (will need to calculate orthogonal view and up)
Obrigado!
pnav@tacc.utexas.edu
Helpful Hints for Labs #1 and #2
VisIt
Open the file RectGrid2.vtk
• Click File -> Open• Select RectGrid2.vtk• Click OK• Active dataset highlighted
VisIt
Open the file RectGrid2.vtk
• Click File -> Open• Select RectGrid2.vtk• Click OK• Active dataset highlighted
VisIt
Create isosurfaces• Click Plots ->
Pseudocolor -> scalars
• Click Operators -> Isosurface
• Click OpAtts -> Isosurface…
• Keep defaults, click Dismiss
• Click Draw
VisIt
Create isosurfaces• Click Plots ->
Pseudocolor -> scalars
• Click Operators -> Isosurface
• Click OpAtts -> Isosurface…
• Keep defaults, click Dismiss
• Click Draw
VisIt
Create isosurfaces• Click Plots ->
Pseudocolor -> scalars
• Click Operators -> Isosurface
• Click OpAtts -> Isosurface…
• Keep defaults, click Dismiss
• Click Draw
VisIt
Create isosurfaces• Click Plots ->
Pseudocolor -> scalars
• Click Operators -> Isosurface
• Click OpAtts -> Isosurface…
• Keep defaults, click Dismiss
• Click Draw
VisIt
Create isosurfaces• Click Plots ->
Pseudocolor -> scalars
• Click Operators -> Isosurface
• Click OpAtts -> Isosurface…
• Keep defaults, click Dismiss
• Click Draw
VisIt
Create isosurfaces• Click Plots ->
Pseudocolor -> scalars
• Click Operators -> Isosurface
• Click OpAtts -> Isosurface…
• Keep defaults, click Dismiss
• Click Draw
VisItClip isosurfaces• Rotate view to +Y axis• Click Operators ->
Clip• Click OpAtts ->
Clip…• Change Normal to
0 -1 0• Click Apply• Click Dismiss
VisItClip isosurfaces• Rotate view to +Y axis• Click Operators ->
Clip• Click OpAtts ->
Clip…• Change Normal to
0 -1 0• Click Apply• Click Dismiss
VisItClip isosurfaces• Rotate view to +Y axis• Click Operators ->
Clip• Click OpAtts ->
Clip…• Change Normal to
0 -1 0• Click Apply• Click Dismiss
VisItClip isosurfaces• Rotate view to +Y axis• Click Operators ->
Clip• Click OpAtts ->
Clip…• Change Normal to
0 -1 0• Click Apply• Click Dismiss
VisItClip isosurfaces• Rotate view to +Y axis• Click Operators ->
Clip• Click OpAtts ->
Clip…• Change Normal to
0 -1 0• Click Apply• Click Dismiss
VisItClip isosurfaces• Rotate view to +Y axis• Click Operators ->
Clip• Click OpAtts ->
Clip…• Change Normal to
0 -1 0• Click Apply• Click Dismiss