求教一个jvm优化的问题

jvm生成的gc.log日志部分如下：
系统正常运行的时候以下日志：
188934.293: [GC (Allocation Failure) [PSYoungGen: 162811K->22501K(174592K)] 1893545K->1753267K(2066944K), 0.0242581 secs] [Times: user=0.05 sys=0.00, real=0.03 secs]
188934.663: [GC (Allocation Failure) [PSYoungGen: 166373K->20315K(174080K)] 1897139K->1751958K(2066432K), 0.0240071 secs] [Times: user=0.04 sys=0.00, real=0.02 secs]
188935.024: [GC (Allocation Failure) [PSYoungGen: 164187K->19269K(175104K)] 1895830K->1750952K(2067456K), 0.0231600 secs] [Times: user=0.05 sys=0.00, real=0.03 secs]
188935.384: [GC (GCLocker Initiated GC) [PSYoungGen: 164677K->19503K(175104K)] 1896758K->1751624K(2067456K), 0.3015056 secs] [Times: user=0.05 sys=0.00, real=0.30 secs]
188935.985: [GC (Allocation Failure) [PSYoungGen: 164911K->22427K(176128K)] 1897249K->1754788K(2068480K), 0.0237001 secs] [Times: user=0.04 sys=0.00, real=0.03 secs]
188936.317: [GC (Allocation Failure) [PSYoungGen: 169371K->20251K(175616K)] 1901732K->1752644K(2067968K), 0.0238539 secs] [Times: user=0.04 sys=0.00, real=0.03 secs]
188936.623: [GC (Allocation Failure) [PSYoungGen: 167195K->21157K(177152K)] 1899588K->1754567K(2069504K), 0.0252904 secs] [Times: user=0.04 sys=0.00, real=0.03 secs]
系统崩溃时候的日志：
240231.356: [GC (Allocation Failure) [PSYoungGen: 137056K->25792K(151552K)] 2003814K->1909806K(2043904K), 0.0336642 secs] [Times: user=0.06 sys=0.01, real=0.03 secs]
240231.390: [Full GC (Ergonomics) [PSYoungGen: 25792K->0K(151552K)] [ParOldGen: 1884013K->1838445K(1892352K)] 1909806K->1838445K(2043904K), [Metaspace: 69010K->68999K(1114112K)], 2.6492174 secs] [Times: user=4.98 sys=0.03, real=2.65 secs]
240234.376: [GC (Allocation Failure) [PSYoungGen: 97237K->28849K(150528K)] 1935682K->1867294K(2042880K), 0.0311394 secs] [Times: user=0.06 sys=0.00, real=0.03 secs]
240234.724: [GC (Allocation Failure) [PSYoungGen: 126129K->29436K(154624K)] 1964574K->1867881K(2046976K), 0.0341698 secs] [Times: user=0.06 sys=0.00, real=0.04 secs]
240235.071: [GC (Allocation Failure) [PSYoungGen: 132348K->28918K(153088K)] 1970793K->1867363K(2045440K), 0.0328635 secs] [Times: user=0.06 sys=0.00, real=0.04 secs]
240235.592: [GC (Allocation Failure) [PSYoungGen: 131830K->29876K(157696K)] 1970275K->1868321K(2050048K), 0.0314764 secs] [Times: user=0.06 sys=0.00, real=0.03 secs]
240235.867: [GC (Allocation Failure) [PSYoungGen: 138932K->29868K(156160K)] 1977377K->1868313K(2048512K), 0.0304961 secs] [Times: user=0.06 sys=0.01, real=0.03 secs]
240235.991: [GC (Allocation Failure) [PSYoungGen: 138924K->29984K(160768K)] 1977369K->1868429K(2053120K), 0.0267918 secs] [Times: user=0.05 sys=0.00, real=0.03 secs]
240236.392: [GC (Allocation Failure) [PSYoungGen: 145184K->30410K(159232K)] 1983629K->1868855K(2051584K), 0.0324369 secs] [Times: user=0.07 sys=0.00, real=0.03 secs]
240236.768: [GC (Allocation Failure) [PSYoungGen: 145600K->31879K(162816K)] 1984045K->1870324K(2055168K), 0.0321725 secs] [Times: user=0.06 sys=0.00, real=0.03 secs]
240237.154: [GC (GCLocker Initiated GC) [PSYoungGen: 151687K->31508K(161792K)] 1990178K->1870000K(2054144K), 0.0327585 secs] [Times: user=0.07 sys=0.00, real=0.04 secs]
240237.565: [GC (Allocation Failure) [PSYoungGen: 151316K->41468K(155136K)] 1990017K->1884117K(2047488K), 0.0535050 secs] [Times: user=0.10 sys=0.00, real=0.05 secs]
240237.881: [GC (Allocation Failure) [PSYoungGen: 155132K->45568K(159232K)] 1997781K->1920879K(2051584K), 0.0963625 secs] [Times: user=0.19 sys=0.00, real=0.10 secs]
240237.978: [Full GC (Ergonomics) [PSYoungGen: 45568K->0K(159232K)] [ParOldGen: 1875311K->1879211K(1892352K)] 1920879K->1879211K(2051584K), [Metaspace: 68999K->68999K(1114112K)], 2.9301065 secs] [Times: user=5.57 sys=0.03, real=2.93 secs]
240241.284: [Full GC (Ergonomics) [PSYoungGen: 113664K->0K(159232K)] [ParOldGen: 1879211K->1884633K(1892352K)] 1992875K->1884633K(2051584K), [Metaspace: 68999K->68999K(1114112K)], 2.8250989 secs] [Times: user=5.38 sys=0.03, real=2.83 secs]
240244.281: [Full GC (Ergonomics) [PSYoungGen: 113633K->0K(159232K)] [ParOldGen: 1884633K->1885318K(1892352K)] 1998266K->1885318K(2051584K), [Metaspace: 68999K->68999K(1114112K)], 2.6993627 secs] [Times: user=5.13 sys=0.02, real=2.70 secs]
240247.258: [Full GC (Ergonomics) [PSYoungGen: 113664K->0K(159232K)] [ParOldGen: 1885318K->1884853K(1892352K)] 1998982K->1884853K(2051584K), [Metaspace: 68999K->68999K(1114112K)], 3.0225106 secs] [Times: user=5.77 sys=0.03, real=3.02 secs]
240250.707: [Full GC (Ergonomics) [PSYoungGen: 113664K->0K(159232K)] [ParOldGen: 1884853K->1884195K(1892352K)] 1998517K->1884195K(2051584K), [Metaspace: 68999K->68995K(1114112K)], 2.8711543 secs] [Times: user=5.42 sys=0.02, real=2.87 secs]
240254.008: [Full GC (Ergonomics) [PSYoungGen: 113664K->0K(159232K)] [ParOldGen: 1885876K->1884390K(1892352K)] 1999540K->1884390K(2051584K), [Metaspace: 68995K->68995K(1114112K)], 2.7715919 secs] [Times: user=5.26 sys=0.03, real=2.77 secs]
240257.077: [Full GC (Ergonomics) [PSYoungGen: 113606K->0K(159232K)] [ParOldGen: 1887564K->1883865K(1892352K)] 2001170K->1883865K(2051584K), [Metaspace: 68995K->68995K(1114112K)], 2.7348059 secs] [Times: user=5.21 sys=0.01, real=2.74 secs]
240259.842: [Full GC (Ergonomics) [PSYoungGen: 113664K->0K(159232K)] [ParOldGen: 1883865K->1883405K(1892352K)] 1997529K->1883405K(2051584K), [Metaspace: 68995K->68995K(1114112K)], 2.8967241 secs] [Times: user=5.53 sys=0.02, real=2.90 secs]
240263.284: [Full GC (Ergonomics) [PSYoungGen: 113664K->0K(159232K)] [ParOldGen: 1883405K->1885915K(1892352K)] 1997069K->1885915K(2051584K), [Metaspace: 68995K->68995K(1114112K)], 2.9344210 secs] [Times: user=5.59 sys=0.03, real=2.93 secs]
240266.638: [Full GC (Ergonomics) [PSYoungGen: 113590K->0K(159232K)] [ParOldGen: 1885915K->1884195K(1892352K)] 1999506K->1884195K(2051584K), [Metaspace: 68995K->68995K(1114112K)], 2.5923498 secs] [Times: user=4.92 sys=0.03, real=2.60 secs]
240269.616: [Full GC (Ergonomics) [PSYoungGen: 113664K->0K(159232K)] [ParOldGen: 1884837K->1885386K(1892352K)] 1998501K->1885386K(2051584K), [Metaspace: 68995K->68995K(1114112K)], 3.0897188 secs] [Times: user=5.90 sys=0.03, real=3.09 secs]

请教以下这大概是什么原因导致的呢。
jvm版本：
java version "1.8.0_25"
Java(TM) SE Runtime Environment (build 1.8.0_25-b17)
Java HotSpot(TM) 64-Bit Server VM (build 25.25-b02, mixed mode)
服务器配置：2核4G内存

另外请教以下下面两行日志的参数分别指的是什么，以及怎么分析这些日志，度娘上面找了很多资料都看不懂这个。。。
240237.565: [GC (Allocation Failure) [PSYoungGen: 151316K->41468K(155136K)] 1990017K->1884117K(2047488K), 0.0535050 secs] [Times: user=0.10 sys=0.00, real=0.05 secs]
240269.616: [Full GC (Ergonomics) [PSYoungGen: 113664K->0K(159232K)] [ParOldGen: 1884837K->1885386K(1892352K)] 1998501K->1885386K(2051584K), [Metaspace: 68995K->68995K(1114112K)], 3.0897188 secs] [Times: user=5.90 sys=0.03, real=3.09 secs]
问题补充：应用启动参数：
java -server -Xmx2g -Xms2g -Xmn200m -verbose:gc -Xloggc:gc.log -XX:+PrintGCDetails -XX:+PrintGCTimeStamps -jar spigot-1.7.9-R0.3-SNAPSHOT.jar
jvm优化 jvm gc.log gc日志
2014年12月10日 15:02 stevenkang
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2个答案 按时间排序 按投票排序

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fullGC回收old区几乎不变，目测内存泄露了，JVM加个参数HeapDumpOutOfMemoryError 然后用MAT工具分析

2014年12月11日 11:04木木_三
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输出的格式解释见
http://www.herongyang.com/JVM/Memory-PrintGCDetails-Garbage-Collection-Logging.html

FullGC没办法回收对象，Old区基本满了，现象应该是程序卡死吧。

学习用jvisualVM检查下内存泄露