Adding --mmap option to use memory-mapped file input, which provides a marginal improvement (<5%) on big benchmarks.

1 files changed, 6 insertions, 0 deletions

diff --git a/src/main/getopt.cpp b/src/main/getopt.cpp
index 7ca889592..baad6fe31 100644
--- a/src/main/getopt.cpp
+++ b/src/main/getopt.cpp
@@ -67,6 +67,7 @@ enum OptionValue {
   SEGV_NOSPIN,
   PARSE_ONLY,
   NO_CHECKING,
+  USE_MMAP,
   SHOW_CONFIG
 };/* enum OptionValue */
 
@@ -103,6 +104,7 @@ static struct option cmdlineOptions[] = {
   { "segv-nospin", no_argument      , NULL, SEGV_NOSPIN },
   { "parse-only" , no_argument      , NULL, PARSE_ONLY  },
   { "no-checking", no_argument      , NULL, NO_CHECKING },
+  { "mmap",        no_argument      , NULL, USE_MMAP    },
   { "show-config", no_argument      , NULL, SHOW_CONFIG }
 };/* if you add things to the above, please remember to update usage.h! */
 
@@ -219,6 +221,10 @@ throw(OptionException) {
       opts->semanticChecks = false;
       break;
 
+    case USE_MMAP:
+      opts->memoryMap = true;
+      break;
+
     case SHOW_CONFIG:
       fputs(Configuration::about().c_str(), stdout);
       printf("\n");