Re: Memory constraints?

Even a 32-bit version of NCL can handle 1.79GB variables.

How much memory is available on the machine you are using?
-----------------------------------------------------------
  dimx = 449l ; l means 64 bit signed integers
  dimy = 399l
  ens_size = 50l
  dimz = 50l
  vsize = dimx*dimy*dimz*ens_size ; variable size
  bytes = 4*vsize ; bytes per variable
  tsize = 3*bytes ; total size (3 variable)

print("vsize="+vsize) ; 447,877,500
print("bytes="+bytes) ; 1,791,510,000
print("tsize="+tsize) ; 5,374,530,000

On 6/4/13 5:02 PM, Adam Phillips wrote:
> Hi Gerry,
> I do not believe NCL has a memory limit. I've recently run a NCL script
> that took 75GB of memory at its' peak. This sounds like a machine
> running out of memory, although your 3 arrays combined take just short
> of 6GB which isn't that much. You can run "top" in another window on
> that machine to see what memory your job is taking (and what memory is
> available on that machine at that time).
> Hope that helps.
> Adam
>
> On 6/4/13 4:26 PM, Gerry Creager - NOAA Affiliate wrote:
>> We're playing with a script that has the following snippet of code:
>>
>> dimx = 449
>> dimy = 399
>> ens_size = 50
>> over_id = new((/10/),"graphic")
>>
>> x_start = 1
>> x_end = dimx-1
>> y_start = 1
>> y_end = dimy-1
>>
>> height = 1000.
>> dimz = 50
>>
>> Uwind_a = new((/dimz,dimy,dimx,ens_size/),"float")
>> Vwind_a = new((/dimz,dimy,dimx,ens_size/),"float")
>> dbz_a = new((/dimz,dimy,dimx,ens_size/),"float")
>>
>> We're seeing an NclMalloc error after the last 'new'. Is there a limit
>> in NCL I need to look at or do you think this is simple memory
>> exhaustion on the machine?
>>
>> Thanks, Gerry
>> --
>> Gerry Creager
>> NSSL/CIMMS
>> 405.325.6371
>> ++++++++++++++++++++++
>> "Big whorls have little whorls,
>> That feed on their velocity;
>> And little whorls have lesser whorls,
>> And so on to viscosity."
>> Lewis Fry Richardson (1881-1953)
>>
>>
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>
>
>
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Received on Tue Jun 4 17:16:41 2013