Re: NCL 64-bit build with Snow Leopard?

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 08:11:03 2010