[readme] Clarify --enable-parallel-mark description

It's Boehm only and not enabled by default on some platforms (e.g. it's disabled on OSX).

diff --git a/README.md b/README.md
index f8f05423a34b47d191f090f7dc41724ff8197657..8305cb08b3f21e081b2f22c5be539246d941753c 100644 (file)
--- a/README.md
+++ b/README.md
@@ -426,8 +426,10 @@ cycle.
 multiple CPUs to do its work.  This helps performance
 on multi-CPU machines as the work is divided across CPUS.
 
-  * This option is not currently the default as we have
-not done much testing with Mono.
+  * This option is not currently the default on OSX
+as it runs into issues there.
+
+  * This option only applies to the Boehm GC.
 
 * `--enable-dtrace`
 

diff --git a/configure.ac b/configure.ac
index da4c798818d193a4b209575ad15978db82305de5..bf6208e5dd7c381f327f974e0c79009ce4f5efcf 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -976,7 +976,7 @@ AC_ARG_WITH(libgc,   [  --with-gc=included,none  Controls the Boehm GC config, d
 AC_ARG_ENABLE(boehm, [  --disable-boehm            Disable the Boehm GC.], support_boehm=$enableval,support_boehm=${support_boehm:-yes})
 AM_CONDITIONAL(SUPPORT_BOEHM, test x$support_boehm = xyes)
 
-AC_ARG_ENABLE(parallel-mark, [  --enable-parallel-mark     Enables GC Parallel Marking], enable_parallel_mark=$enableval, enable_parallel_mark=$parallel_mark)
+AC_ARG_ENABLE(parallel-mark, [  --enable-parallel-mark     Enables Boehm GC Parallel Marking], enable_parallel_mark=$enableval, enable_parallel_mark=$parallel_mark)
 if test x$enable_parallel_mark = xyes; then
        libgc_configure_args="$libgc_configure_args --enable-parallel-mark"
 fi