why a java proccess's resident memory and virtual memory usage is very different between jre 1.6.43 and jre 1.7.25 -

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when java proccess run in jre 1.6.43,i use top command monitor memory usage,show fellow:

top - 09:14:05 13 days, 23:04,  2 users,  load average: 1.78, 1.35, 1.25 tasks:   1 total,   0 running,   1 sleeping,   0 stopped,   0 zombie cpu(s):  1.5%us,  1.3%sy,  0.0%ni, 95.7%id,  1.5%wa,  0.0%hi,  0.0%si,  0.0%st mem:     23651m total,    23466m used,      184m free,      402m buffers swap:    40962m total,        0m used,    40962m free,    17427m cached    pid user      pr  ni  virt  res  shr s %cpu %mem    time+  command                                                                                                  23764 sysomc    20   0  695m 467m  12m s   16  2.0  58:53.41 java

then, run java proccess in jre 1.7.25,the top command show memory usage like:

top - 10:40:26 15 days, 31 min,  1 user,  load average: 0.77, 0.89, 0.87 tasks:   1 total,   0 running,   1 sleeping,   0 stopped,   0 zombie cpu(s):  1.5%us,  1.3%sy,  0.0%ni, 95.5%id,  1.6%wa,  0.0%hi,  0.0%si,  0.0%st mem:     23651m total,    19892m used,     3758m free,     1651m buffers swap:    40962m total,        0m used,    40962m free,    12055m cached    pid user      pr  ni  virt  res  shr s %cpu %mem    time+  command                                                                                                  27282 sysomc    20   0 1100m 896m  13m s    2  3.8   1:34.51 java

the problem that,why java proccess's resident memory , virtual memory usage different between jre 1.6.43 , jre 1.7.25


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