Add Log4j2 benchmark tool

- Configurable thread count, duration, message size
- Multiple logging configurations: sync-immediate, sync-buffered
- AsyncLogger variants: 1k, 4k, 10k, 1m ring buffer sizes
- AsyncAppender variants: 1k, 4k, 10k, 1m buffer sizes
- Subprocess isolation for proper async logger initialization
- Cache dropping between tests for accurate benchmarks
- CSV output support

1 files changed, 48 insertions, 0 deletions

diff --git a/src/main/java/bench/BenchConfig.java b/src/main/java/bench/BenchConfig.java
new file mode 100644
index 0000000..cc73444
--- /dev/null
+++ b/src/main/java/bench/BenchConfig.java
@@ -0,0 +1,48 @@
+package bench;
+
+import java.util.List;
+
+public class BenchConfig {
+    public enum Mode { DURATION, EVENTS }
+
+    private int threads = 10;
+    private Mode mode = Mode.DURATION;
+    private long durationSeconds = 10;
+    private long totalEvents = 1_000_000;
+    private long warmupSeconds = 3;
+    private int messageSize = 100;
+    private List<String> configs = List.of(
+        "sync-immediate", "sync-buffered",
+        "async-1k", "async-4k", "async-10k",
+        "asyncapp-1k", "asyncapp-4k", "asyncapp-10k"
+    );
+    private String outputFile = null;
+
+    public int getThreads() { return threads; }
+    public void setThreads(int threads) { this.threads = threads; }
+
+    public Mode getMode() { return mode; }
+    public void setMode(Mode mode) { this.mode = mode; }
+
+    public long getDurationSeconds() { return durationSeconds; }
+    public void setDurationSeconds(long durationSeconds) { this.durationSeconds = durationSeconds; }
+
+    public long getTotalEvents() { return totalEvents; }
+    public void setTotalEvents(long totalEvents) { this.totalEvents = totalEvents; }
+
+    public long getWarmupSeconds() { return warmupSeconds; }
+    public void setWarmupSeconds(long warmupSeconds) { this.warmupSeconds = warmupSeconds; }
+
+    public int getMessageSize() { return messageSize; }
+    public void setMessageSize(int messageSize) { this.messageSize = messageSize; }
+
+    public List<String> getConfigs() { return configs; }
+    public void setConfigs(List<String> configs) { this.configs = configs; }
+
+    public String getOutputFile() { return outputFile; }
+    public void setOutputFile(String outputFile) { this.outputFile = outputFile; }
+
+    public String generateMessage() {
+        return "X".repeat(messageSize);
+    }
+}