Re: NCL 64-bit build with Snow Leopard?

Hi Harry,

There could be a number of factors here. For one, your two sets of
binaries may have been compiled with different options that can make
a world of difference in speed.

Can you give more information about what kind of files you're
opening, how big the variables are that you are reading, and on what
type of call does it die on?

Even better, if you can provide the script and data, let me know, and
I'll send you information offline about where to put the files.

Thanks,

--Mary

On Jan 12, 2010, at 8:10 AM, Ian Harris wrote:

> Hi All,
>
> With a lot of patient help from Mary, I now have NCL installed on a
> 64-bit Snow Leopard Mac (with 8GB of memory). Hurrah!
>
> And then I tried out my complicated regridding program. It worked
> as before, until it got to a particularly large model data file,
> and died with a malloc error:
>
> ncl(92301) malloc: *** mmap(size=933122048) failed (error code=12)
> *** error: can't allocate region
> *** set a breakpoint in malloc_error_break to debug
> fatal:NclMalloc Failed:[errno=12]
> Bus error
>
> This may be over 2gb in total as it's a reshaping: size in =
> 233280000 cells, size out = 233280000 cells, floats are 4 bytes
> each so we're close to 2gb but should be under? The malloc() call
> is failing with 933122048 which is pretty much 233280000 * 4 bytes.
> Now I really have deleted everything else prior to the reshape, but
> in any case, as no one variable is over 2GB should it not work?
>
> I am also puzzled that:
>
> 1. Memory usage at the time of the crash is 1.15GB real, 1.33
> virtual. But there's plenty of free 'real' memory so why use
> virtual? I guess that may be the OS's decision.
>
> 2. In the Activity Monitor, ncl appears to have a 'kind' of
> 'PowerPC', instead of 'Intel (64 bit)'. Hopefully that's not
> important.
>
> Cheers for any helpful observations. And do we have a date for
> version 5.2.0 yet?
>
> Harry
>
> Ian "Harry" Harris
> Climatic Research Unit
> School of Environmental Sciences
> University of East Anglia
> Norwich NR4 7TJ
> United Kingdom
>
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Received on Tue Jan 12 14:31:48 2010