| Index: src/flag-definitions.h | 
| diff --git a/src/flag-definitions.h b/src/flag-definitions.h | 
| index c83d4e29f7558905d260e2002ae0d92b87a0e25d..fa38773bb07cf0b3dc46c8dd5404df38db5cdf36 100644 | 
| --- a/src/flag-definitions.h | 
| +++ b/src/flag-definitions.h | 
| @@ -430,7 +430,7 @@ DEFINE_bool(trace_incremental_marking, false, | 
| "trace progress of the incremental marking") | 
| DEFINE_bool(track_gc_object_stats, false, | 
| "track object counts and memory usage") | 
| -DEFINE_bool(parallel_sweeping, false, "enable parallel sweeping") | 
| +DEFINE_bool(parallel_sweeping, true, "enable parallel sweeping") | 
| DEFINE_bool(concurrent_sweeping, false, "enable concurrent sweeping") | 
| DEFINE_int(sweeper_threads, 1, | 
| "number of parallel and concurrent sweeping threads") | 
|  |