有没有办法找出为特定进程分配了多少总虚拟内存?我有一个程序,我也在放置一个性能跟踪器,它将监视进程使用多少内存以及剩余多少内存供它使用。
要做到这一点,我需要知道为进程分配了多少内存。有没有办法在Java中这样做?我在Windows 7上运行。
另外,我目前一直在使用Sigar类来监视其他内存统计信息。 sigar是否有特定的类/功能可以找到我要找的东西?
答案 0 :(得分:1)
您可以使用Visualvm。
在您的代码中计算使用的内存: -
Runtime runtime = Runtime.getRuntime(); // Get the Java runtime
long memory = runtime.totalMemory() - runtime.freeMemory(); // Calculate the used memory
答案 1 :(得分:0)
要在@Mitesh提到的内容上添加更多内容,
int var=1; // for bytes. you can change here to print in MB or KB as you wish
log.info("************************* PRINTING MEMORY USAGE - BEGIN **************");
Runtime runtime = Runtime.getRuntime();
/* Total number of processors or cores available to the JVM */
log.info("Available processors (cores): "
+ runtime.availableProcessors());
/* This will return Long.MAX_VALUE if there is no preset limit */
long maxMemory = runtime.maxMemory();
/* Maximum amount of memory the JVM will attempt to use */
log.info("Maximum memory : "
+ (maxMemory == Long.MAX_VALUE ? "no limit" : maxMemory / var));
/* Total memory currently available to the JVM */
long totalMemory = runtime.totalMemory() / var;
log.info("Total memory available to JVM : "
+ totalMemory);
/* Total amount of free memory available to the JVM */
long freeMemory = runtime.freeMemory() / var;
log.info("Free memory : " + freeMemory);
// Calculate the used memory
long usedMemory = totalMemory - freeMemory;
log.info("Used memory : " + usedMemory);