[Carpet] PsiKadelia and Carpet

[Hee Il Kim]

Thanks Erik,

- I think the problem was caused by memory excess. I took grid sizes too
large. I thought it is safe because the run lasted more than 100 timesteps
but suddenly it used up a node memory. I'm not sure whether this is a memory
leak. But I don't see any drastic memory increase for smaller grid sizes
even though it is not observed for a long time. I will ask you about more
details if the problem turns out to be a serious one.

- I didn't try to make an account for LSU HPC yet. If I make the account,
then can I get 10,000 SUs as other users or .. ? Which machines can I use
for Cactus run?

- It's not related to Carpet code but I'd like to hear your advice. I will
make( or buy) a new cluster for Cactus/Whisky run. It will be used for
debugging and small size problems. There are many options but I'm going to
take one of the two options;

Option1: ( 2 x Quadcore Intel Xeon 2.33 GHz CPUs, 16 giga memory) x 4
computing nodes with a good server system + scsi hardware raid, commercial
compilers and softwares, Gigabit ethernet  = Total 32 CPU cores & 64 Giga
RAM

Option2: ( 2 x Quadcore Intel Xeon 2.00 GHz Cpus,  16 giga memory) x 8
computing nodes with normal server system + SATA hardware/fake raid,
non-commercial compilers and softwares, Gigabit ethernet = Total 64 CPU
cores & 128 Giga RAM

I prefer the second option but I don't know which one is better for the
purpose. The machine will be shared with several other members, especailly
for n-body simulations.

I'd like to hear any of your experience and advice.

Hee Il

2007/11/14, Erik Schnetter <schnetter at cct.lsu.edu>:
>
>
> Hee Il,
>
> PsiKadelia contains approximately the same MPI complexity as one
> right hand side evaluation of BSSN.  It's not particularly more complex.
>
> What kind of error messages do you get?  Are these errors where MPI
> complains that there is an error in the programme, e.g. a deadlock,
> or is it an error where something within MPI has become inconsistent,
> e.g. a lost message?  Does the problem also appear when you run on a
> single node?
>
> If you suspect a hardware problem, you can go to <http://
> www.hpc.lsu.edu/accounts/> and apply for an account at the LSU HPC
> machines, naming me as sponsor.  You can then run the same code and
> parameter file on one of the LSU machines and see whether the error
> persists.
>
> -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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-- 
Dr. Kim, Hee Il
Astronomy Program
Dept. of Physics and Astronomy
Seoul National University, Seoul, 151-747, Korea
emails: khi at astro.snu.ac.kr, heeilkim at gmail.com
tel +82-2-880-1429, fax 887-1435, mobile 018-222-4385
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