On 2007-07-19, at 09:14, Hamish wrote:
ideas so far:1) [Linux] create a 2GB ramdisk using ramfs. use g.mapset to swich intoit, do the heavy i/o. switch back to the original mapset, g.copy the results map back to the "real" mapset, then destroy the ramdisk. advantages: easy to do. disadvantages: it's more of a local hack than a general solution.
[...]
You can't. Well actually you could use sudo (preferably with nopasswd option) to chown+chmod the dir. Apart from that I'd suggest using something from BSD family, but that's not that important :)problem: how to set group ID and mode/umask for ramdrive without having to do chown+chmod as root?
You'll get a great speed boost - the problem with a lot of disk I/O operations isn't about caching (you could probably increase the cache size, but that's not it) but I/Os themselves. RAMdrive gets rid of this problem :) Tested and working great (not with GRASS though :) )
regards
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