Re: [Haskell-cafe] How can I improve the pipes's performance with a huge file?

On 14.11.2014 10:43, zhangjun.julian wrote:

emptyMap = DM.empty::(DM.Map (String,String) Int)

Laziness makes your data swell. 1) Try using ByteString or Text instead of String. 2) Try the UNPACK pragma, AFAIR it requires -O2. data Key = Key {-# UNPACK #-} !ByteString {-# UNPACK #-} !ByteString https://hackage.haskell.org/package/ghc-datasize - this package will help you to determine the actual data size -- Wojtek