因为系统隔三岔五地出现问题，每次都重启服务器就能解决了，所以我想是不是系统里面存在内存泄漏，但是对操作系统这方面一窍不通，百度了一下，用了jmap -heap pid输出了以下参数，本人只能看到From Space的使用率特别高，其他的几个使用率也不低，但是具体有没有毛病就不太清楚了，恳求各位大佬帮忙看一下哪些参数有异常。谢谢。

zsdx@HXTEST01:/etc/tomcat8/logs$ sudo jmap -heap 948
Attaching to process ID 948, please wait...
Debugger attached successfully.
Server compiler detected.
JVM version is 25.131-b11

using thread-local object allocation.
Parallel GC with 4 thread(s)

Heap Configuration:
   MinHeapFreeRatio         = 0
   MaxHeapFreeRatio         = 100
   MaxHeapSize              = 1038090240 (990.0MB)
   NewSize                  = 21495808 (20.5MB)
   MaxNewSize               = 346030080 (330.0MB)
   OldSize                  = 43515904 (41.5MB)
   NewRatio                 = 2
   SurvivorRatio            = 8
   MetaspaceSize            = 21807104 (20.796875MB)
   CompressedClassSpaceSize = 1073741824 (1024.0MB)
   MaxMetaspaceSize         = 17592186044415 MB
   G1HeapRegionSize         = 0 (0.0MB)

Heap Usage:
PS Young Generation
Eden Space:
   capacity = 161480704 (154.0MB)
   used     = 96519472 (92.04814147949219MB)
   free     = 64961232 (61.95185852050781MB)
   59.771520441228695% used
From Space:
   capacity = 24641536 (23.5MB)
   used     = 24184032 (23.063690185546875MB)
   free     = 457504 (0.436309814453125MB)
   98.14336249168883% used
To Space:
   capacity = 40370176 (38.5MB)
   used     = 0 (0.0MB)
   free     = 40370176 (38.5MB)
   0.0% used
PS Old Generation
   capacity = 159907840 (152.5MB)
   used     = 82973360 (79.12956237792969MB)
   free     = 76934480 (73.37043762207031MB)
   51.88823762487193% used