Dear GHC team, I withdraw my last bug report. It was about processing a long list on a 64 bit machine оn GHC-6.10.2. First, I cannot reproduce (?) this bug report invitation from GHC on using +RTS -M4000m Second, I have found that the process interruption only occurs when this test program runs out of RAM. And personally, I would rather use "+RTS -M15000m -RTS" and not to consider at all the system effects after the RAM overflow. Third, I apply now a more clear example, whith [Int] instead of [Integer]: --------------------------------------------------------- import List (genericReplicate) main = putStr (shows res "\n") where e = -- 22, 23 ... list = genericReplicate (2^e) 1 :: [Int] rList = reverse list res = myMin $ zipWith (+) list rList myMin [] = error "\nmyMin []\n" myMin [x] = x myMin (x: y: xs) = if x > y then myMin (y: xs) else myMin (x: xs) ------------------------------------------------------ ghc -O --make Test64 ./Test64 +RTS -M800m -RTS -- for 1 Gb 32 bit machine ./Test64 +RTS -M12000m -RTS -- for 16 Gb 64 bit machine The last possible e for the small machine (800 Mb) occurs 24, for the big machine (12000 Mb) occurs 27 -- which looks reasonable. The timing also looks reasonable. Regards, ----------------- Serge Mechveliani mechvel@botik.ru