Visualizing with VTK
The official source code release of VTK is available from the VTK home page at http://www.kitware.com/vtk.html. For the more daring, almost-daily beta releases are available from http://www.kitware.com/vtkData/Nightly.html. On the average Linux system, software required to compile and run VTK includes the following: C++, OpenGL (or Mesa), tkUnixPort.h (from the Tk source distribution), Tcl 7.4 or higher, Tk 4.0 or higher. If you plan to use the Python or Java bindings to VTK, you will need those packages as well.
The VTK source code is written entirely in C++, and as of version 2.0 with Linux 2.0.31 and either libc5 or libc6, it compiles successfully without error with Mesa 2.5 and Tcl/Tk 8.0. In the README file at the top of the distribution, the user will find all the instructions necessary to do the build. Here's what I did:
Obtained and compiled Mesa (easy).
Retrieved tkUnixPort.h from the Tk source distribution and placed it in the (vtk_top_dir)/unix/directory (I used Tcl/Tk 8.0).
Ran ./configure --with-mesa --with-tcl --with-shared --with-tkwidget --with-patented
Edited user.make to find all the necessary support files.
Ran make install (optional; run only if you have the disk space).
Many more configuration options are available and can be seen by typing ./configure --help. I had trouble with the Python and Java bindings. The build, as configured above, takes about an hour on a Pentium-Pro 200MHz machine.
Many examples are available to test the installation in the (vtk_top_dir)/[graphics|imaging|patented|contrib]/examples[Cxx|tcl|Python] directories. Most imaging examples require the vtkdata archive to also be located at the VTK home site. Graphics examples will, for the most part, run as is. For the C++ examples, compile with make and run. Tcl examples can be run by typing the following from the Tcl examples directory: ../../tcl/vtk example_file.tcl, or, if vtk has been installed, vtk example_file.tcl. Examples employing the TkRenderWidget object cause a segmentation fault when using the XFree SVGA server, but work with the S3 server. (I haven't tested others.) Fortunately, TkRenderWidget is not required for any visualization pipeline; you can't embed the render window in a Tk window. However, this problem will likely be solved by the time you read this article.
Practical Task Scheduling Deployment
July 20, 2016 12:00 pm CDT
One of the best things about the UNIX environment (aside from being stable and efficient) is the vast array of software tools available to help you do your job. Traditionally, a UNIX tool does only one thing, but does that one thing very well. For example, grep is very easy to use and can search vast amounts of data quickly. The find tool can find a particular file or files based on all kinds of criteria. It's pretty easy to string these tools together to build even more powerful tools, such as a tool that finds all of the .log files in the /home directory and searches each one for a particular entry. This erector-set mentality allows UNIX system administrators to seem to always have the right tool for the job.
Cron traditionally has been considered another such a tool for job scheduling, but is it enough? This webinar considers that very question. The first part builds on a previous Geek Guide, Beyond Cron, and briefly describes how to know when it might be time to consider upgrading your job scheduling infrastructure. The second part presents an actual planning and implementation framework.
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With all the industry talk about the benefits of Linux on Power and all the performance advantages offered by its open architecture, you may be considering a move in that direction. If you are thinking about analytics, big data and cloud computing, you would be right to evaluate Power. The idea of using commodity x86 hardware and replacing it every three years is an outdated cost model. It doesn’t consider the total cost of ownership, and it doesn’t consider the advantage of real processing power, high-availability and multithreading like a demon.
This ebook takes a look at some of the practical applications of the Linux on Power platform and ways you might bring all the performance power of this open architecture to bear for your organization. There are no smoke and mirrors here—just hard, cold, empirical evidence provided by independent sources. I also consider some innovative ways Linux on Power will be used in the future.Get the Guide