Java 在 Linux 虚拟机上占用过多内存
做了个top发现这个
top - 22:04:27 up 7:47, 3 users, load average: 0.02, 0.08, 0.26
Tasks: 1 total, 0 running, 1 sleeping, 0 stopped, 0 zombie
Cpu(s): 2.9% us, 0.9% sy, 0.0% ni, 95.9% id, 0.0% wa, 0.0% hi, 0.2% si
Mem: 7914188k total, 2750184k used, 5164004k free, 54392k buffers
Swap: 16383992k total, 0k used, 16383992k free, 415828k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
2970 xxxxxx 18 0 24.5g 258m 10m S 0 3.3 0:42.05 java
VIRT是24.5g，硬盘只有20g。
pmap -x 2970 显示 95 倍 262136k 作为 anon。
请问有什么问题吗？？
Doing a top shows this
top - 22:04:27 up 7:47, 3 users, load average: 0.02, 0.08, 0.26
Tasks: 1 total, 0 running, 1 sleeping, 0 stopped, 0 zombie
Cpu(s): 2.9% us, 0.9% sy, 0.0% ni, 95.9% id, 0.0% wa, 0.0% hi, 0.2% si
Mem: 7914188k total, 2750184k used, 5164004k free, 54392k buffers
Swap: 16383992k total, 0k used, 16383992k free, 415828k cached
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
2970 xxxxxx 18 0 24.5g 258m 10m S 0 3.3 0:42.05 java
VIRT is 24.5g and the hard disk is only 20g.
pmap -x 2970 reveals 95 times 262136k as anon.
Please advise as to is something wrong??
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从实用的角度来看（发现进程使用了多少内存）VIRT列几乎没有意义，不用担心。
Java 下的虚拟内存使用情况Linux，使用了太多内存
From a practical point of view (discover how much memory is used by the process) the VIRT column is almost meaningless, don't worry about it.
Virtual Memory Usage from Java under Linux, too much memory used