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by zeta
January 31st, 2012, 11:40 pm
Forum: Programming and Software Forum
Topic: FPGAs vs GPUs for high frequency?
Replies: 13
Views: 18444

FPGAs vs GPUs for high frequency?

<r>I think DrFPGA makes some excellent points. A cheap way to get some experience with fpga at roughly one tenth the price of a virtex board is <URL url="http://www.fpga4fun.com/">http://www.fpga4fun.com/</URL>. Also checkout ISE webpack, it's relatively easy to get some simple bit files together, t...
by zeta
January 31st, 2012, 11:17 pm
Forum: Programming and Software Forum
Topic: DF's usual dumb errors
Replies: 23
Views: 17471

DF's usual dumb errors

uninitialised variables are a common cause for this difference in behaviour, try valgrind or purify
by zeta
January 26th, 2012, 12:28 pm
Forum: Programming and Software Forum
Topic: How to monitor each thread behavior of a multithread (pthread) C++ program on Linux ?
Replies: 8
Views: 16066

How to monitor each thread behavior of a multithread (pthread) C++ program on Linux ?

<t>yeh what do you need to know? valgrind{ helgrind,cachegrind,callgrind} is excellent for identifying race conditions, monitoring cache usage and calls executed, respectively. The latter has almost excruciating detail, you may want to use callgrind_annotate to summarise the profile data. There's lo...
by zeta
September 30th, 2011, 9:47 am
Forum: Off Topic
Topic: Rising Damp in Holland
Replies: 22
Views: 17782

Rising Damp in Holland

we have an old federal home (~1860) in the US built over a cave system & subterranean creek; without a dehumidifier running there's a veritable swimming pool in the basement
by zeta
September 12th, 2011, 12:46 pm
Forum: Programming and Software Forum
Topic: how to do (non-blocking) communication among boost threads
Replies: 15
Views: 19277

how to do (non-blocking) communication among boost threads

I've used and would recommend reactor based patterns for this problem, eg., there's some solutions discussed here -> http://www.artima.com/articles/io_design_patterns2.html
by zeta
September 6th, 2011, 6:10 pm
Forum: Programming and Software Forum
Topic: Nan in release mode
Replies: 21
Views: 21224

Nan in release mode

can you set something like -fpe0 -traceback ala intel?
by zeta
September 2nd, 2011, 6:47 pm
Forum: Programming and Software Forum
Topic: extracting signed and unsigned numbers from byte arrays in java
Replies: 4
Views: 18878

extracting signed and unsigned numbers from byte arrays in java

save yourself the hassle of manipulating bits for lack of an unsigned type (therein lies much anguish for C developers) and use bytebuffer
by zeta
August 25th, 2011, 2:28 pm
Forum: Programming and Software Forum
Topic: Java books
Replies: 8
Views: 21088

Java books

+1 scala; you might also check out functionaljava.org, I've hacked with this. The Sun java langspec is also a good read.
by zeta
August 23rd, 2011, 12:50 pm
Forum: Programming and Software Forum
Topic: parallel sorting algos
Replies: 6
Views: 20360

parallel sorting algos

<r>what platform? Thrust (CUDA) has a merge sort, or you could check this out -> <URL url="https://wiki.cc.gatech.edu/multicore/index.php/Parallelizing_Sort_Algorithms"><LINK_TEXT text="https://wiki.cc.gatech.edu/multicore/in ... Algorithms">https://wiki.cc.gatech.edu/multicore/index.php/Parallelizi...
by zeta
August 18th, 2011, 11:54 pm
Forum: Programming and Software Forum
Topic: parallel sorting algos
Replies: 6
Views: 20360

parallel sorting algos

there's an example of a bitonic sort in gpu gems; thrust is an excellent STL-like CUDA template library with a few examples too
by zeta
June 10th, 2011, 10:45 am
Forum: Numerical Methods Forum
Topic: Tension Splines and Optimization
Replies: 11
Views: 25825

Tension Splines and Optimization

<t> acceleration==second derivative. After SplineUnderTension class instance foo is created with x/y data, a new point is simply foo.getInterpValue(x_new) etc. This method is robust w/ noise and large derivatives, very good for seismic data. a quick google reveals a few interesting talks on the subj...
by zeta
May 27th, 2011, 6:46 am
Forum: Numerical Methods Forum
Topic: Tension Splines and Optimization
Replies: 11
Views: 25825

Tension Splines and Optimization

<t>I dunno how helpful this-I'm in oil+gas- but I had to port some fortran to Java dealing with Cline's spline under tension; here's some untested C++, a quick'n'dirty port of the java. The method is particularly stable with regards to calculating the 2nd derivative, apologies in advance if I'm way ...
by zeta
August 23rd, 2010, 11:57 pm
Forum: Numerical Methods Forum
Topic: PCG discussions
Replies: 13
Views: 29575

PCG discussions

should be some references hereI highly recommend spike/pspike by Sameh, schenk et al for those who want something highly scalable and alternative to precon krylov type solutions (I don't know if pspike is in the public domain yet)
by zeta
August 23rd, 2010, 6:59 am
Forum: Numerical Methods Forum
Topic: PCG discussions
Replies: 13
Views: 29575

PCG discussions

I have no doubt -in fact the codebase is going to amg ultimately- when we get there I think the plan is saad et als miluot
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