On Thu, Jun 11, 2015 at 1:46 PM, Moritz Lennert < [email protected]> wrote:
> 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. > Oh, I didn't know that it already has it. Good to know! > > Thanks to both of you ! > > Moritz > > >
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