Klaus Thorn writes:
Dear Arnt, thanks!Is this trial and error or is it known to work?
A mixture. Mostly the latter in this case, but in other cases it could be more trial and error.
I suggest to clarify on http://archiveopteryx.org/conf/memory-limit that memory-limit does not only switch towards conserving/freeing RAM but can run in serious trouble when too low.
Will do. Arnt