On 11/06/15 19:02, Nikos Alexandris wrote:
* Moritz Lennert <[email protected]> [2015-06-11 18:37:36 +0200]:
Hello,
In a python script I have the following call:
grass.run_command('r.series',
input = rate_maps,
output = sum_rates,
method = 'sum',
overwrite = True,
quiet=True)
rate_maps is a list which in one instance contains 8559 map names,
leading to an "OSError: [Errno 7] Argument list too long".
I know that in the shell I could use xargs to work around such a
problem. But how to do this in python ?
What it the OS limit for it?
I suppose this is ARG_MAX ?
getconf ARG_MAX
2097152
A text file with all file names only uses 144551 bytes.
Or is there another limit I should look at ?
I could obviously loop through all maps and thus sum them individually,
but this just seems horribly inefficient.
Does anyone have a better solution ?
- Maybe split in two or three sessions (instead of looping over all)?
Yes, thanks, I can do that. I'll also try the file option mentioned by
Anna (r.series actually has one). Didn't think of that.
Thanks to both of you !
Moritz
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