[Users] Problem with CarpetRegrid2/AMR

[Hal Finkel]

On Tue, 2011-08-30 at 21:06 -0400, Erik Schnetter wrote:
> On Tue, Aug 30, 2011 at 5:28 PM, Hal Finkel <hfinkel at anl.gov> wrote:
> > Could I also decrease the block size? I currently have
> > CarpetRegrid2::adaptive_block_size = 4, could it be smaller than that?
> > Is there a restriction based on the number of ghost points?
> 
> Yes, you can reduce the block size. I assume that both the regridding
> operation and the time evolution will become slower if you do that,
> because more blocks will have to be handled. This will also require
> more memory, since each block carries its own ghost zone overhead.

When I try reducing the block size from 4 to 3, it exits with:

build/CarpetLib/th.cc:107: void th::regrid(): Assertion
`times.at(ml).at(rl).at(tl) < times.at(ml).at(rl).at(tl-1)' failed.
p0_31544:  p4_error: interrupt SIGx: 6

A block size of 2 is either really slow or it hangs.

I'll try a larger box for now.

Thanks again,
Hal

> 
> No, there is no such restriction.
> 
> -erik
> 

-- 
Hal Finkel
Postdoctoral Appointee
Leadership Computing Facility
Argonne National Laboratory
1-630-252-0023
hfinkel at anl.gov