On a big computation with many @parallel decorators I eventually get

[Errno 31] Too many links: '/home/vbraun/.sage//temp/hostname/26457/'

This is caused by trying to create >2^15 ~ 32k subdirectories, which is an 
ext2/ext3 limitation. Is there any reason why the @parallel forker creates 
its own temp directories but then does not clean them up? Each NNNN 
subdirectory contains a single empty interface/ subdirectory.

PS: This is on a NFS partition, just deleting 32k directories takes a 
loooong time.

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