Re: [ferret_users] Mac memory limit problem?

[Andy Jacobson <andy.jacobson@xxxxxxxx>]

Hi Ryo,

I can't confirm; my Mac doesn't manifest this problem:


	NOAA/PMEL TMAP
 	FERRET v6.82  
 	Darwin 9.8.0 - 08/06/12
 	 6-Aug-14 09:40     

yes? set memory/size=269
 Cached data cleared from memory
yes? set memory/size=5000
 Cached data cleared from memory
Internal overflow expressing 5000.0 Mwords as words (705032704) 
Unable to allocate the requested 5000.0 Mwords of memory.
Memory remaining at 269.0 Mwords.
yes? 


-Andy

On Tue 05 Aug 2014, at 21:49 , Ryo Furue <furue@xxxxxxxxxx> wrote:

> Ferret users (on Mac in particular),
> 
> It seems that memory that Ferret can use is limited to about 1 GiB
> (giga bytes) and I thought this can be a bug.
> 
> yes? set memory/size=269
> ferret_v6.82(33692) malloc: *** mmap(size=2152001536) failed (error code=12)
> *** error: can't allocate region
> *** set a breakpoint in malloc_error_break to debug
> Unable to allocate 269.0 Mwords of memory.
> Restoring previous memory of 268.0 Mwords.
> 
> I can't allocate 269 Mwords, which is about 1.00 GiB if one "word" is
> 4 bytes.  Because of this problem, I can't read a variable which is a
> little over 1 GiB.  Ferret says "request exceeds memory setting: 292
> Mwords were requested."
> 
> I thought 2 GiB is the actual maximum.  The error message contains
> some hints that corroborate:
> 
> 1) size=2152001536 is 2.00 GiB (if it's in bytes).
> 
> 2) error code = 12 is "Cannot allocate memory" (from /usr/include/sys/errno.h).
> 
> From this, I guess that at some point in the Ferret code, one "word"
> is interpreted as 8 bytes.
> 
> Ferret v6.82 for Mac.
> 
> Best regards,
> 
> Ryo
> ----
> P.S.  I use this convention: "M" == 10^6, "Mi" = 2^20, "G" == 10^9,
> "Gi" == 2^30.

-- 
Andy Jacobson
andy.jacobson@xxxxxxxx

NOAA Earth System Research Lab
Global Monitoring Division
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