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Re: Memory management when concatenating arrays [message #92192 is a reply to message #92189]

Wed, 28 October 2015 07:54

Yngvar Larsen
Messages: 134
Registered: January 2010

Senior Member

On Wednesday, 28 October 2015 15:44:05 UTC+1, Yngvar Larsen wrote:
> I ran the following script:

Bug fix for the last two cases follows. Still same conclusion, but

print, '**************'
print, 'Preallocation with zero initialization:'
tic
all_data = fltarr(nx,ny,nt*10)
for ii=0, N-1 do all_data[0,0,ii*nt] = data
toc

print, '**************'
print, 'Preallocation without zero initialization'
tic
all_data = fltarr(nx,ny,nt*10, /NOZERO)
for ii=0, N-1 do all_data[0,0,ii*nt] = data
toc

Concatenation:
Process took 6.524 seconds
**************
Preallocation with zero initialization:
Process took 1.506 seconds
**************
Preallocation without zero initialization
Process took 1.244 seconds

I also ran with double precision arrays, and got this:

Concatenation:
Process took 21.428 seconds
**************
Preallocation with zero initialization:
Process took 5.366 seconds
**************
Preallocation without zero initialization
Process took 2.953 seconds

--
Yngvar

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[Message index]

		Memory management when concatenating arrays By: rjp23 on Wed, 28 October 2015 06:49
		Re: Memory management when concatenating arrays By: Alain Kattnig on Wed, 28 October 2015 06:58
		Re: Memory management when concatenating arrays By: greg.addr on Wed, 28 October 2015 07:16
		Re: Memory management when concatenating arrays By: Phillip Bitzer on Wed, 28 October 2015 07:41
		Re: Memory management when concatenating arrays By: Yngvar Larsen on Wed, 28 October 2015 07:44
		Re: Memory management when concatenating arrays By: Yngvar Larsen on Wed, 28 October 2015 07:54

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