[Yt-dev] new branch with lower overhead

[Matthew Turk]

Can you check the masses of the halos?  If we assume that an hdf5 is
composed of:

sizeof(metadata) * n_arrays
sizeof(particle) * n_particles

then the only real datapoint we have here is that it's the same number
of arrays and same number of *total* particles.  I'm not sure this
assumption is valid, but I'd like to ensure we aren't seeing particles
moving between halos.

But, it's great to hear that HOP doesn't need anything changed.


On Fri, Jan 16, 2009 at 12:53 PM, Stephen Skory <stephenskory at yahoo.com> wrote:
>> If you could give it a checkout and run some simple analysis with it,
>> that'd be awesome
>
> I ran parallel hop on Ranger with this an it was faster than the previous version. It gave identically sized HDF5 files for my halo data, which is good, but I'm guessing since things might have been computed and saved in a different order the md5 sums don't match. To be really sure, I'd have to do a group-by-group comparison, but the fact that the sizes are the same says that the same number of groups and particles in each group were found both times.
>
> login4% ll *hdf5
> -rw-r--r--  1 tg457850 G-80416 1611766912 Jan 15 19:41 HOPtables.hdf5
> -rw-r--r--  1 tg457850 G-80416 1611766912 Jan 16 14:42 HOPtables-new.hdf5
> login4% md5sum HOPtables*
> 179e3765c8220db3c8aa2b91752c400c  HOPtables.hdf5
> 8dd848895e7706043b081534f54de53d  HOPtables-new.hdf5
>
>
>  _______________________________________________________
> sskory at physics.ucsd.edu           o__  Stephen Skory
> http://physics.ucsd.edu/~sskory/ _.>/ _Graduate Student
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