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I came across this benchmark comparison ( http://compubench.com/compare.jsp?config_0=14470292&config_1=18133965 ) between GTX-Titan and Tesla K40c, and the results seems very odd.Can someone please explain any possible reason behind this. How much would Tesla differ in performance if only single precision operations are being performed?
I'd opt for the Titan because it has more up-to-date instruction set capabilities. The GK110 ASIC that it is based on has SM 3.5 capability (e.g. read-through-texture, funnel shift) and also supports dynamic parallelism.
Maxwell is coming soon, but it will support more capabilities, not fewer, so you should use the GK110 as a baseline.
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Is there any working tridiagonal solver for non base 2 matrix (for example matrix as such: 500X500)?
The algorithm at https://code.google.com/p/tridiagonalsolvers/source/browse/#svn%2Ftrunk%2Ftridiagonalsolvers deals only with base 2.
Is there any difficultly in implementing such solver for non base 2 matrices?
The cuSparse library can sovle tridiagonal systems of arbitrary length.
The two functions you want to look at are:
cusparsegtsv(): http://docs.nvidia.com/cuda/cusparse/#cusparse-lt-t-gt-gtsv
cusparsegtsv_nopivot(): http://docs.nvidia.com/cuda/cusparse/#cusparse-lt-t-gt-gtsv_nopivot
There is also a batched tridiagonal solver.
You'll get best performance when the matrix side-length is a power-of-two, but you may not lose a lot of performance for non power-of-two matrices, especially if they're slightly below a power of two.
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I am looking for a usable GPU based constraint solver for solving constrained timetables for schools. The constraint problem is course timetabling.
http://docs.jboss.org/drools/release/latestFinal/optaplanner-docs/html_single/#curriculumCourse
JaCoP is another constraint solver https://github.com/radsz/jacop
I am not aware of such already available solver.
But:
Satisfiability solvers can be used to solve timetable problems as discussed in this dissertation.
The CUD#SAT project demonstrates how to solve SAT problems using NVIDIA CUDA architecture.
It might be instructive to use the search facility of hpgu.org. It is fully devoted to such projects.
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Is there any opensource tools for monitoring MySQL performance.
It should be like
1) where exactly the server is loaded
2) what is the performance of each and every query that access DB.
3) Graphical View of the performance using piecharts, bardiagrams etc.
There are many tools which you can use, some of them are paid
MONyog MySQL Monitor
MySQL Enterprise Monitor
Percona Toolkit
There are also other tools and tips here.
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DES class is not support WP8, is there have some alternative solution or 3rd part libirary on windows phone 8 platform?
http://msdn.microsoft.com/en-us/library/vstudio/system.security.cryptography.des.aspx
Consider to our bussiness, we can't use other encryption algorithm, and that also we need a high performance DES algorithm to encrypting a 1M file quickly, Anybody know?
Many Thanks~
There is a C# version of Bouncy Castle that can be compiled for Windows Phone and supports DES.
Be aware of the limitations of DES encryption though and how its key size means it is no longer considered secure.
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Where can I download Source Code Of "OpenGL" ?
If you want to see how a rasterizer (the thing that displays polygons on the screen) is done in software, follow Eric's suggestion and check out mesa3d or google "rasterizer".
If you want to see how a rasterizer is done on hardware, I'm afraid the only thing you can have access to is a photo of a GPU die.
If you want to see how a 3D engine is done, take a look at Ogre, Irrlicht or any other.
If you want to know what happens under the hood when you call glDrawArray on a geForce, you can't. The drivers are proprietary. They more or less forward the call to the graphic card, but it's such a simplification... for instance, a typical DirectX call takes more than 10000 cpu instructions.