allocate error

[fiona3668]

memory allocate error
when using antsRegistrationSyNQuick.sh, I found there is a error. It says "Failed to allocate memory for image"

Does it means I run out of RAM? How much I need for this?

• antsRegistrationSyNQuick.sh -d 3 -f ~/0502_VENOUS.nii -m ~/0500_PRECON.nii -o output

• Exception caught:
  itk::MemoryAllocationError (0x7f3a20000940)
  Location: "unknown"
  File: /home/fiona/bin/antsBuild/staging/include/ITK-5.1/itkImportImageContainer.hxx
  Line: 192
  Description: Failed to allocate memory for image.

• Ubtuntu 16.4

• Type of system: laptop

[cookpa]

It depends on the images. What size are they?

[fiona3668]

they are 512 512 80（80mb）,and my pc is 8G.

[cookpa]

By default the scripts use double precision (see usage to change to single), so that's 160 Mb, and you'll need several multiples of this for both the images, and all the warp fields.

You can try

free -m

to see how much RAM is available. The total installed on the machine is an upper limit, but it doesn't mean ANTs can allocate all of that, or even most of it.

[gdevenyi]

512x512x80 is large, and you get a x3 if you're doing a SyN registration. 8GB is definitely not enough.

[fiona3668]

ok thank you guys.