DB Restart

Hi,

We are facing issue with the RES memory. Below is the o/p of top command. It shows that writer process reserved 3.8g. We have observed that if it increased to 3.9g we need to restart the db. Otherwise it hangs.  Kindly suggest us the good way to figure it out this issue.   shared_buffer is 3 GB.   

PID       USER      PR  NI  VIRT   RES  SHR S %CPU %MEM    TIME+  COMMAND

 4822 postgres  15   0 4045m 3.8g 3.8g S  0.7 12.1   2:09.63 postgres: writer process

18860 postgres  15   0 12868 1276  816 R  0.7  0.0   0:00.43 top

 4825 postgres  15   0 86904 2648  660 S  0.3  0.0   0:25.32 postgres: stats collector process

 3992 postgres  15   0 88220 1848 1104 S  0.0  0.0   0:00.09 sshd: postgres@pts/11

 3993 postgres  15   0 66060 1628 1200 S  0.0  0.0   0:00.02 -bash

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Thanks

Sam Jas