Refactoring of the GC in preparation for parallel GC

[ghc-hetmet.git] / rts / RtsFlags.c

diff --git a/rts/RtsFlags.c b/rts/RtsFlags.c
index f8c8403..69064ea 100644 (file)
--- a/rts/RtsFlags.c
+++ b/rts/RtsFlags.c
@@ -212,6 +212,7 @@ void initRtsFlagsDefaults(void)
     RtsFlags.ParFlags.nNodes           = 1;
     RtsFlags.ParFlags.migrate           = rtsTrue;
     RtsFlags.ParFlags.wakeupMigrate     = rtsFalse;
+    RtsFlags.ParFlags.gcThreads         = 1;
 #endif
 
 #ifdef PAR
@@ -445,6 +446,7 @@ usage_text[] = {
 #endif /* DEBUG */
 #if defined(THREADED_RTS) && !defined(NOSMP)
 "  -N<n>     Use <n> OS threads (default: 1)",
+"  -g<n>     Use <n> OS threads for GC (default: 1)",
 "  -qm       Don't automatically migrate threads between CPUs",
 "  -qw       Migrate a thread to the current CPU when it is woken up",
 #endif
@@ -1117,6 +1119,18 @@ error = rtsTrue;
                      errorBelch("bad value for -N");
                      error = rtsTrue;
                    }
+               }
+               ) break;
+
+             case 'g':
+               THREADED_BUILD_ONLY(
+               if (rts_argv[arg][2] != '\0') {
+                   RtsFlags.ParFlags.gcThreads
+                     = strtol(rts_argv[arg]+2, (char **) NULL, 10);
+                   if (RtsFlags.ParFlags.nNodes <= 0) {
+                     errorBelch("bad value for -g");
+                     error = rtsTrue;
+                   }
 #if defined(PROFILING)
                     if (RtsFlags.ParFlags.nNodes > 1) {
                         errorBelch("bad option %s: only -N1 is supported with profiling", rts_argv[arg]);