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| author | Simon Marlow <marlowsd@gmail.com> | 2008-11-18 14:24:42 +0000 |
|---|---|---|
| committer | Simon Marlow <marlowsd@gmail.com> | 2008-11-18 14:24:42 +0000 |
| commit | d600bf7a6afdbfc4a22f9379406a9c6f789a4c2d (patch) | |
| tree | fc86da89b8891374298c441d14d2333b33e29d53 /compiler/cmm/CmmExpr.hs | |
| parent | 0fa59deb44b8a1a0b44ee2b4cc4ae0db31dec038 (diff) | |
| download | haskell-d600bf7a6afdbfc4a22f9379406a9c6f789a4c2d.tar.gz | |
Add optional eager black-holing, with new flag -feager-blackholing
Eager blackholing can improve parallel performance by reducing the
chances that two threads perform the same computation. However, it
has a cost: one extra memory write per thunk entry.
To get the best results, any code which may be executed in parallel
should be compiled with eager blackholing turned on. But since
there's a cost for sequential code, we make it optional and turn it on
for the parallel package only. It might be a good idea to compile
applications (or modules) with parallel code in with
-feager-blackholing.
ToDo: document -feager-blackholing.
Diffstat (limited to 'compiler/cmm/CmmExpr.hs')
| -rw-r--r-- | compiler/cmm/CmmExpr.hs | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/compiler/cmm/CmmExpr.hs b/compiler/cmm/CmmExpr.hs index 06149b490d..69a4952ed6 100644 --- a/compiler/cmm/CmmExpr.hs +++ b/compiler/cmm/CmmExpr.hs @@ -267,6 +267,7 @@ data GlobalReg -- We keep the address of some commonly-called -- functions in the register table, to keep code -- size down: + | EagerBlackholeInfo -- stg_EAGER_BLACKHOLE_info | GCEnter1 -- stg_gc_enter_1 | GCFun -- stg_gc_fun |