[Developers] help

hughwang at cct.lsu.edu hughwang at cct.lsu.edu
Thu Sep 28 08:38:31 CDT 2006

Thanks, Jian,
    This is a great help.
    May I talk to you sometime?


Quoting jtao at cct.lsu.edu:

> Hi Hugh,
> I did something very similar long time ago. I made some changes to meet
> your needs just for fun. I hope it can help you in some way.
> The basic idea is to define two grid functions seq1 and seq2.
> As Erik pointed out in his email, each processor will read its own data and
> output its own result. I don't think there is anyway to go around this on the
> user's level. Just to get things started, I output the chunk for each
> processor
> labeled by result_Procxxx.dat.
> I attached my thorn together with a dat file (under VectorReader/par) used
> for testing purpose. You can easily manipulate the input function
> (VectorReader_Read) to fit your needs. Some modifications are necessary if
> you want to use it in production on huge files.
> Also, if you want to check the output from other processors you can try
> ./cactus_yourexe -r vector.par to redirect the output to the main processor
> to check things out.
> ThornList to Compile:
> ---------------------
> GeneSeq/VectorReader
> Parameter File to Run:
> ----------------------
> ActiveThorns="PUGH VectorReader"
> # clean up the screen
> cactus::cctk_show_schedule= "no"
> # no evolution
> cactus::cctk_itlast       = 0
> # input and output files
> VectorReader::vector_file = "vector.dat"
> VectorReader::resultfile_prefix = "result"
> VectorReader::resultfile_postfix = ".dat"
> #this should be equal to the number of rows in vector.dat
> driver::global_nx         = 42
> driver::ghost_size        = 0
> Good luck,
> Jian
> Quoting hughwang at cct.lsu.edu:
>> Hi all,
>>    Just wonder if anybody can provide me (or tell me where to get) an
>> application example of Cactuscode. I have checked through
>> cactuscode.org, but could not get much help.
>>    Something like this would be ideal for me: a master processor
>> reads in a 2D array (like 2X3) of characters, splices the array into
>> three vectors (2X1), send each vector to a slave processor, then, the
>> slave processors compare the two characters in their received vectors
>> and send either 0 or 1 (the two characters equal or not) back to the
>> master. Codes in C are highly appreciated.
>>    This type of examples might be very helpful for people from other
>> fields to use cactuscode.
>> Regards,
>> Hugh
>> Quoting Erik Schnetter <schnetter at cct.lsu.edu>:
>>> On Sep 26, 2006, at 09:48:17, Michael Koppitz wrote:
>>>> Hi all,
>>>> it seems a common task for many applications to have some
>>>> reduction of some value on a sphere (integral, max, min).
>>>> Would it be useful to implement a general reduction operator
>>>> or (probably even better) to give existing reduction operators a mask
>>>> they are confined to work on?
>>> Thorn SphericalSurface has a way to store spheres.  We recently
>>> developed a thorn SphericalHarmonics, which performs various
>>> integrations and reductions over such spheres, among other things.
>>> Maybe this thorn could help in the short term?
>>> -erik
>>> --
>>> Erik Schnetter <schnetter at cct.lsu.edu>
>>> My email is as private as my paper mail.  I therefore support encrypting
>>> and signing email messages.  Get my PGP key from www.keyserver.net.
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