diff options
| author | Simon Peyton Jones <simonpj@microsoft.com> | 2017-04-03 08:48:28 +0100 |
|---|---|---|
| committer | Simon Peyton Jones <simonpj@microsoft.com> | 2017-04-06 12:29:57 +0100 |
| commit | dd228b6eae18a05675b698fa309403d2310a269b (patch) | |
| tree | 76948380c516850ff61e1d804094277ef52c9be3 /compiler/stranal | |
| parent | c600f3cee57a31c0ac9e3d88e0519f6bf056f55d (diff) | |
| download | haskell-dd228b6eae18a05675b698fa309403d2310a269b.tar.gz | |
Add comments on DmdAnal space leak fix
Diffstat (limited to 'compiler/stranal')
| -rw-r--r-- | compiler/stranal/DmdAnal.hs | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/compiler/stranal/DmdAnal.hs b/compiler/stranal/DmdAnal.hs index 2fc33a48b8..304a2becb3 100644 --- a/compiler/stranal/DmdAnal.hs +++ b/compiler/stranal/DmdAnal.hs @@ -90,6 +90,9 @@ evaluated everywhere that we produce it, so we just run a single seqBinds over the output before returning it, to ensure that there are no references holding on to the input Core program. +This makes a ~30% reduction in peak memory usage when compiling +DynFlags (cf Trac #9675 and #13426). + This is particularly important when we are doing late demand analysis, since we don't do a seqBinds at any point thereafter. Hence code generation would hold on to an extra copy of the Core program, via |