src/share/vm/runtime/arguments.cpp

rev 8615 : CMSParallelFullGC: Parallel version of CMS Full GC.

*** 1399,1408 ****
--- 1399,1414 ----
    if (PrintGCDetails && Verbose) {
      tty->print_cr("MarkStackSize: %uk  MarkStackSizeMax: %uk",
        (unsigned int) (MarkStackSize / K), (uint) (MarkStackSizeMax / K));
      tty->print_cr("ConcGCThreads: %u", ConcGCThreads);
    }
+ 
+   if (CMSParallelFullGC && ParallelGCThreads <= 1) {
+     // Disable CMSParallelFullGC if there is only one parallel
+     // GC thread.
+     CMSParallelFullGC = false;
+   }
  }
  #endif // INCLUDE_ALL_GCS
  
  void set_object_alignment() {
    // Object alignment.
*** 2086,2095 ****
--- 2092,2116 ----
      FLAG_SET_DEFAULT(UseGCOverheadLimit, false);
    }
  
    status = status && check_gc_consistency();
  
+   if (CMSParallelFullGC) {
+     if (!UseConcMarkSweepGC) {
+       // The CMS collector (-XX:+UseConcMarkSweepGC) must be
+       // selected in order to use CMSParallelFullGC.
+       if (FLAG_IS_CMDLINE(CMSParallelFullGC)) {
+         jio_fprintf(defaultStream::error_stream(),
+                     "error:  invalid argument combination.\n"
+                     "The CMS collector (-XX:+UseConcMarkSweepGC) must be "
+                     "selected in order\nto use CMSParallelFullGC.\n");
+         status = false;
+       }
+       FLAG_SET_DEFAULT(CMSParallelFullGC, false);
+     }
+   }
+ 
    // CMS space iteration, which FLSVerifyAllHeapreferences entails,
    // insists that we hold the requisite locks so that the iteration is
    // MT-safe. For the verification at start-up and shut-down, we don't
    // yet have a good way of acquiring and releasing these locks,
    // which are not visible at the CollectedHeap level. We want to