APP crashed during master bias calibration

[KeesScherer]

I had 157 lights (Canon 6D CR2), 30 flats and 150 bias frames. During the calibration step i checked the size of the bias.dat file by looking at the APP folder. The size of the bias.app grew to a pretty big file and a minute right after i made this screenprint APP crashed.  (Linux Mint KDE 64bit/ Intel Core i7/ 8GB RAM/ SSD)

[Haverkamp]

Hi Kees, APP uses filemapping for stacking (which on a SSD is really fast), you need to work on a partition with enough space. For 100 bias of your Canon 6D I suspect you need only 10GB of free space, which shouldn’t be a problem I think?

Also try to work on your fastest drive, this will speed things up.

I’ll check if I can prevent the crashing of APP if there is no more free space.

[Haverkamp]

For stacking of your lights you’ll need about 3x more free space, since the RGB data after registration is 3-channel data, whereas the calibration is done only with the one-channel CFA data.

[KeesScherer]

My SSD has 40 GB free space, i have my lights, flats and bias files on an external USB3 (1.5 TB) hard drive, so i can not stack 157 lights, 30 flats and 150 bias frames with this setup.  I think you should clearly indicate the system requirements, to compare things, i can stack any number of lights, flats and bias in DeepSkyStacker with 4 GB RAM when there is enough external hard drive space. Maybe i should set the APP working directory pointing to the external drive?

[Haverkamp]

“Maybe i should set the APP working directory pointing to the external drive?”

Indeed, that would be the solution if you have enoug room there to let APP work.

[Haverkamp]

I often use a 3TB external USB 3.0 drive to let APP do it’s thing. No problem. But make sure your OS can write in the external drive.

For instance, Mac OS has a problem natively to write on a external NTFS drive…

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