# HG changeset patch
# User Thomas Wuerthinger <thomas.wuerthinger@oracle.com>
# Date 1424133804 -3600
# Node ID ac5b08ea9a6aa4a07ccc4628f9a988be5c6336c2
# Parent  a5c9756f9649f090c87d0dcf30b5aabbad6c12fe
Make Truffle compilations multi-threaded on multi-core systems. Introduce TruffleCompilerThreads option for a manual override.

diff -r a5c9756f9649 -r ac5b08ea9a6a graal/com.oracle.graal.truffle.hotspot/src/com/oracle/graal/truffle/hotspot/HotSpotTruffleRuntime.java
--- a/graal/com.oracle.graal.truffle.hotspot/src/com/oracle/graal/truffle/hotspot/HotSpotTruffleRuntime.java	Tue Feb 17 01:26:27 2015 +0100
+++ b/graal/com.oracle.graal.truffle.hotspot/src/com/oracle/graal/truffle/hotspot/HotSpotTruffleRuntime.java	Tue Feb 17 01:43:24 2015 +0100
@@ -98,7 +98,18 @@
                 }
             }
         });
-        compileQueue = new ThreadPoolExecutor(1, 1, 0L, TimeUnit.MILLISECONDS, new LinkedBlockingQueue<Runnable>(), factory);
+        int selectedProcessors = TruffleCompilerOptions.TruffleCompilerThreads.getValue();
+        if (selectedProcessors == 0) {
+            // No manual selection made, check how many processors are available.
+            int availableProcessors = Runtime.getRuntime().availableProcessors();
+            if (availableProcessors >= 4) {
+                selectedProcessors = 2;
+            } else if (availableProcessors >= 12) {
+                selectedProcessors = 4;
+            }
+        }
+        selectedProcessors = Math.max(1, selectedProcessors);
+        compileQueue = new ThreadPoolExecutor(2, 2, 0L, TimeUnit.MILLISECONDS, new LinkedBlockingQueue<Runnable>(), factory);
 
     }
 
diff -r a5c9756f9649 -r ac5b08ea9a6a graal/com.oracle.graal.truffle/src/com/oracle/graal/truffle/TruffleCompilerOptions.java
--- a/graal/com.oracle.graal.truffle/src/com/oracle/graal/truffle/TruffleCompilerOptions.java	Tue Feb 17 01:26:27 2015 +0100
+++ b/graal/com.oracle.graal.truffle/src/com/oracle/graal/truffle/TruffleCompilerOptions.java	Tue Feb 17 01:43:24 2015 +0100
@@ -104,6 +104,9 @@
     @Option(help = "Enable asynchronous truffle compilation in background thread", type = OptionType.Expert)
     public static final OptionValue<Boolean> TruffleBackgroundCompilation = new OptionValue<>(true);
 
+    @Option(help = "Manually set the number of compiler threads", type = OptionType.Expert)
+    public static final StableOptionValue<Integer> TruffleCompilerThreads = new StableOptionValue<>(0);
+
     @Option(help = "Enable inlining across Truffle boundary", type = OptionType.Expert)
     public static final OptionValue<Boolean> TruffleInlineAcrossTruffleBoundary = new OptionValue<>(false);