Increased memory usage with GHC 7.10.1

[Michal Terepeta]

On Mon, Apr 13, 2015 at 12:20 PM, Christiaan Baaij
<christiaan.baaij at gmail.com> wrote:
>
> Hi,
>
> I wonder if this might be in any way related to the HUGE amount of new terms/types/coercions created by the specialiser as documented in:
> https://ghc.haskell.org/trac/ghc/ticket/9630#comment:10
>
> I don’t have a profiled version of GHC, so I was wondering if you could run your tests with a ‘-fno-specialise’, and see how everything performs then?
>
> Cheers,
>
> Christiaan

Unfortunately trac is timing out for me, so I'll have a look at the
issues later...

As for compiling haskell-src-exts with both -fno-specialise and -fno-call-arity,
we're pretty much at the same level as GHC 7.8.4.



Mon Apr 13 20:25 2015 Time and Allocation Profiling Report  (Final)

  ghc +RTS -p -RTS  [...] -fno-specialise -fno-call-arity

total time  =       89.93 secs   (89928 ticks @ 1000 us, 1 processor)
total alloc = 93,495,685,792 bytes  (excludes profiling overheads)

COST CENTRE       MODULE          %time %alloc

SimplTopBinds     SimplCore        38.7   38.6
pprNativeCode     AsmCodeGen        5.1    5.9
StgCmm            HscMain           3.7    3.3
occAnalBind.assoc OccurAnal         3.2    3.6
OccAnal           SimplCore         3.2    3.6
tc_rn_src_decls   TcRnDriver        3.1    2.5
RegAlloc          AsmCodeGen        3.1    4.2
regLiveness       AsmCodeGen        3.0    3.5
FloatOutwards     SimplCore         2.7    2.4
sink              CmmPipeline       2.6    2.7
Simplify          SimplCore         2.5    0.1
NewStranal        SimplCore         1.9    2.3
genMachCode       AsmCodeGen        1.8    1.7
layoutStack       CmmPipeline       1.6    1.7
NativeCodeGen     CodeOutput        1.4    1.5
FloatInwards      SimplCore         1.2    1.6
CoreTidy          HscMain           1.2    1.2
deSugar           HscMain           1.2    1.2
do_block          Hoopl.Dataflow    1.1    0.7
CorePrep          HscMain           1.0    1.1
versioninfo       MkIface           0.9    1.0
Parser            HscMain           0.9    1.2
Digraph.scc       Digraph           0.9    1.5
canEvVar          TcCanonical       0.7    1.0