snuyanzin commented on code in PR #29418:
URL: https://github.com/apache/flink/pull/29418#discussion_r4208116015
##########
flink-table/flink-table-runtime/src/main/java/org/apache/flink/table/runtime/generated/CompileUtils.java:
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@@ -73,6 +75,37 @@ public static void cleanUp() {
COMPILED_EXPRESSION_CACHE.cleanUp();
}
+ static final String WARM_UP_CLASS = "JaninoWarmUp";
+ static final String WARM_UP_CODE =
+ "public class JaninoWarmUp { public long eval(long a, long b) {
return a + b; } }";
+
+ private static final AtomicBoolean WARMED_UP = new AtomicBoolean(false);
+
+ /**
+ * Compiles a throwaway class on a daemon thread so the Janino compiler is
loaded and JIT-warmed
Review Comment:
local results
| N (warm-ups) | cold compile (ms) | after N runs (ms) |
|---:|---:|---:|
| 1 | 146 | 34 |
| 5 | 142 | 20 |
| 10 | 142 | 14 |
| 20 | 143 | 14 |
| 30 | 143 | 13 |
| 40 | 141 | 13 |
| 50 | 145 | 14 |
| 60 | 143 | 17 |
| 70 | 143 | 12 |
| 80 | 140 | 13 |
| 90 | 146 | 12 |
| 100 | 145 | 13 |
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