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| author | Simon Marlow <marlowsd@gmail.com> | 2009-03-13 13:51:16 +0000 |
|---|---|---|
| committer | Simon Marlow <marlowsd@gmail.com> | 2009-03-13 13:51:16 +0000 |
| commit | 4e3542263207ae49963811aeb84927027e7bb61d (patch) | |
| tree | 90814c02010977694748704fc96bf4347bf2104f /rts/sm/GC.h | |
| parent | 8fda9784f1eff82aa243073fd31b181080be3109 (diff) | |
| download | haskell-4e3542263207ae49963811aeb84927027e7bb61d.tar.gz | |
Use work-stealing for load-balancing in the GC
New flag: "+RTS -qb" disables load-balancing in the parallel GC
(though this is subject to change, I think we will probably want to do
something more automatic before releasing this).
To get the "PARGC3" configuration described in the "Runtime support
for Multicore Haskell" paper, use "+RTS -qg0 -qb -RTS".
The main advantage of this is that it allows us to easily disable
load-balancing altogether, which turns out to be important in parallel
programs. Maintaining locality is sometimes more important that
spreading the work out in parallel GC. There is a side benefit in
that the parallel GC should have improved locality even when
load-balancing, because each processor prefers to take work from its
own queue before stealing from others.
Diffstat (limited to 'rts/sm/GC.h')
| -rw-r--r-- | rts/sm/GC.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/rts/sm/GC.h b/rts/sm/GC.h index 366125d159..fb6e385979 100644 --- a/rts/sm/GC.h +++ b/rts/sm/GC.h @@ -28,6 +28,8 @@ extern StgPtr oldgen_scan; extern long copied; +extern rtsBool work_stealing; + #ifdef DEBUG extern nat mutlist_MUTVARS, mutlist_MUTARRS, mutlist_MVARS, mutlist_OTHERS; #endif |