| Index: src/flag-definitions.h | 
| diff --git a/src/flag-definitions.h b/src/flag-definitions.h | 
| index 7018cf8d4ac897194aae4891aa226cfef44c0fd4..1136daa4e9dacfe16b0543eccfd2f69c4d143e41 100644 | 
| --- a/src/flag-definitions.h | 
| +++ b/src/flag-definitions.h | 
| @@ -529,8 +529,8 @@ 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(concurrent_sweeping, true, "enable concurrent sweeping") | 
| +DEFINE_bool(parallel_sweeping, true, "enable parallel sweeping") | 
| +DEFINE_bool(concurrent_sweeping, false, "enable concurrent sweeping") | 
| DEFINE_int(sweeper_threads, 0, | 
| "number of parallel and concurrent sweeping threads") | 
| #ifdef VERIFY_HEAP | 
|  |