如何优化 tomcat？需要加内存？

[snopy]

tomcat 的 manager 页面显示如下：

JVM

Free memory: 1612.34 MB Total memory: 1961.87 MB Max memory: 3640.93 MB

Memory Pool Type Initial Total Maximum Used

PS Eden Space Heap memory 512.00 MB 594.75 MB 1247.87 MB 116.28 MB (9%)

PS Old Gen Heap memory 1365.37 MB 1365.37 MB 2730.68 MB 231.50 MB (8%)

PS Survivor Space Heap memory 85.31 MB 1.75 MB 1.75 MB 1.73 MB (99%)

Code Cache Non-heap memory 2.43 MB 12.25 MB 48.00 MB 12.00 MB (25%)

PS Perm Gen Non-heap memory 256.00 MB 256.00 MB 512.00 MB 130.38 MB (25%)

这种情况需要优化 tomcat 内存配置吗？请大神讲讲怎么优化，谢谢