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McIDAS-V Technical Issues

McIDAS-V Technical Issues. Memory use Java3D / Graphics drivers Remote display Background processing. McIDAS-V Memory Use. Data is normally represented as 32bits per data point (work is being done to represent ADDE imagery as 8bit) Ancillary information is propagated with data objects

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McIDAS-V Technical Issues

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  1. McIDAS-V Technical Issues • Memory use • Java3D / Graphics drivers • Remote display • Background processing

  2. McIDAS-V Memory Use • Data is normally represented as 32bits per data point (work is being done to represent ADDE imagery as 8bit) • Ancillary information is propagated with data objects • Units • Error estimates • Navigation • Java Virtual Machine controls memory garbage collection

  3. Java Memory Use • McIDAS-V will use 80% of available memory by default (heap size) • 32bit Java can address a maximum of 1536mb RAM • 64bit Java can address all available system RAM • Garbage collection is controlled by the Java Virtual Machine • Many factors affect garbage collection timing • Aggressive memory use is good for performance Total available (Heap size) Maximum Current

  4. Java3D / Graphics drivers • McIDAS-V uses cutting-edge 3D features • Java Runtime Environment version 5 and Java3D 1.5 are included as part of the installers • Many runtime errors can be fixed by updating your graphics card drivers • McIDAS-V fails to launch • Excessive CPU usage (100%) • “Torn” or gray images • Java3D error messages

  5. Setting the JRE on OS X • Core 2 Duo Macs running OS X 10.5 Leopard include Java 5 (32 and 64bit) and Java 6 (64bit) JREs • Apple does not provide Java 6 or Java 5 64bit for PowerPC or older Intel Macs • The “Java Preferences” utility is used to specify the current JRE

  6. Remote Display • “export DISPLAY” does not work with McIDAS-V • Java3D does not use the X11 window system • A local OpenGL graphics resource is required • Accelerated graphics card • 3D library (e.g., Mesa) • Java3D and OpenGL enable the powerful visualization capabilities of McIDAS-V

  7. Background Processing • Running McIDAS-V without creating a graphical user interface • Offscreen rendering with the “offscreen” option • Requires an active window manager • User must be logged in • Xvfb provides a virtual display resource for Java3D • Installed by default on newer Red Hat 5 systems • Freely available for most UNIX-like OSs • Binary packages • Source

  8. Running McIDAS-V using Xvfb • Create a virtual Xvfb display on screen :1.0 Xvfb :1 -screen 0 1024x768x24 & • Set your display for McIDAS-V to :1.0 export DISPLAY=:1.0 • Start McIDAS-V with a bundle or ISL file to process runMcV <bundle>

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