On 10 August 2005 09:04, Frederik Eaton wrote:

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Compiling a module which imports the 14 smaller modules takes much less time than compiling the monolithic module - it's almost 5 times faster (see below).

We've found the cause of this, and committed a fix. The full HTMLMonda98.hs now compiles in 27 seconds for me, without optimisation (with 6.4 it is several minutes). Let's hope the same issue is affecting other compilations too :-)

Wow! That's great.

Have you looked at how compile time varies with module size in the fixed version?

Not in any detail; but I expect it to be worse than linear but not as bad as quadratic. There are several reasons it might be worse than linear: GC is linear in the residency, for one. And the compiler makes a lot of use of FiniteMap, which will add a (log n) factor to a traversal of the tree. We try to fix instances of quadratic behaviour as we find them. Cheers, Simon