[backend] adjust the thread pool size with the numbers of the CPU (#1625

)

* [backend] adjust the thread pool size with the numbers of the CPU

* [backend] 2x size for the pool

* [backend]ignore Vulnerability

.trivyignore

@@ -31,3 +31,4 @@ CVE-2024-45490
 CVE-2024-45491
 CVE-2024-45492
 CVE-2024-47554
+CVE-2023-49462

backend/src/main/java/heartbeat/config/ThreadPoolConfig.java

@@ -13,8 +13,13 @@ public class ThreadPoolConfig {
 	public ThreadPoolTaskExecutor taskExecutor() {
 		ThreadPoolTaskExecutor executor = new ThreadPoolTaskExecutor();
 		executor.setRejectedExecutionHandler(new ThreadPoolExecutor.CallerRunsPolicy());
-		executor.setCorePoolSize(20);
-		executor.setMaxPoolSize(100);
+		int numOfCores = Runtime.getRuntime().availableProcessors();
+
+		int corePoolSize = numOfCores * 2;
+		int maxPoolSize = corePoolSize * 2;
+
+		executor.setCorePoolSize(corePoolSize);
+		executor.setMaxPoolSize(maxPoolSize);
 		executor.setQueueCapacity(1000);
 		executor.setKeepAliveSeconds(60);
 		executor.setThreadNamePrefix("Heartbeat-");