My server has 62 GB RAM but now i can see only 716 MB RAM is free. Below is the output of free -lh command
total used free shared buffers cached
Mem: 62G 62G 716M 277M 415M 52G
Low: 62G 62G 716M
High: 0B 0B 0B
-/+ buffers/cache: 9.8G 53G
Swap: 15G 16M 15G
From the above output i can see that only 716 MB is free out of 62GB but when i see the process using top -o RES command as shown below(sorted in descending order of RES) only glassfish is consuming 5 GB ram and rest of the other processes are in MB's. if we add up the memory of all this processes then it will not reach to 62GB. My question is then now which processes are consuming more memory and why the top command is not showing theses processes??
top - 04:20:33 up 5 days, 15:46, 2 users, load average: 0.00, 0.00, 0.02
Tasks: 272 total, 1 running, 271 sleeping, 0 stopped, 0 zombie
%Cpu(s): 0.1 us, 0.1 sy, 0.0 ni, 99.8 id, 0.0 wa, 0.0 hi, 0.0 si, 0.0 st
MiB Mem: 64431.17+total, 63715.67+used, 715.496 free, 415.574 buffers
MiB Swap: 16380.99+total, 16.984 used, 16364.01+free. 53273.82+cached Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
18640 glassfish+20 0 20.284g 5.399g 59.9m S 0.0 8.6 48:56.94 java
2750 h+ 20 0 20.294g 954.7m 19.8m S 0.0 1.5 3:06.16 java
7837 h+ 20 0 20.294g 899.9m 20.0m S 0.0 1.4 0:20.89 java
2088 tomcat6 20 0 5641.2m 493.9m 20.7m S 0.0 0.8 3:59.54 java
2166 mirth 20 0 6572.8m 375.2m 21.7m S 0.0 0.6 7:26.73 java
1307 oj 20 0 20.670g 308.1m 19.5m S 0.3 0.5 10:28.15 java
31903 postgres 20 0 384.2m 77.4m 76.0m S 0.0 0.1 0:00.25 postgres
1799 rabbitmq 20 0 2167.9m 69.2m 4.0m S 0.7 0.1 47:14.13 beam.smp
6622 postgres 20 0 386.0m 36.8m 34.0m S 0.0 0.1 0:00.50 postgres
1668 postgres 20 0 384.2m 32.7m 31.4m S 0.0 0.1 0:19.87 postgres
2234 h+ 20 0 318.3m 23.8m 3.8m S 0.0 0.0 0:17.42 beam.smp
7857 postgres 20 0 385.3m 15.5m 13.2m S 0.0 0.0 0:00.33 postgres
31904 postgres 20 0 384.2m 12.1m 10.7m S 0.0 0.0 0:00.49 postgres
8089 postgres 20 0 385.2m 10.9m 8.9m S 0.0 0.0 0:00.00 postgres
8090 postgres 20 0 385.2m 10.9m 8.9m S 0.0 0.0 0:00.00 postgres
8091 postgres 20 0 385.2m 10.9m 8.9m S 0.0 0.0 0:00.00 postgres
8092 postgres 20 0 385.2m 10.9m 8.9m S 0.0 0.0 0:00.00 postgres
7919 postgres 20 0 385.2m 10.8m 8.8m S 0.0 0.0 0:00.00 postgres
8088 postgres 20 0 385.2m 10.8m 8.8m S 0.0 0.0 0:00.00 postgres
7920 postgres 20 0 385.2m 10.8m 8.8m S 0.0 0.0 0:00.00 postgres
8093 postgres 20 0 385.2m 10.8m 8.8m S 0.0 0.0 0:00.00 postgres
8094 postgres 20 0 385.2m 10.8m 8.8m S 0.0 0.0 0:00.00 postgres
573 syslog 20 0 250.0m 10.3m 2.3m S 0.0 0.0 0:01.98 rsyslogd
31902 postgres 20 0 384.7m 8.0m 6.3m S 0.0 0.0 0:01.63 postgres
31905 postgres 20 0 384.8m 7.3m 5.6m S 0.0 0.0 0:00.23 postgres
16662 root 20 0 103.2m 6.6m 5.5m S 0.0 0.0 0:00.06 sshd
5064 root 20 0 103.2m 6.5m 5.5m S 0.0 0.0 0:00.03 sshd
5301 root 20 0 103.2m 6.5m 5.5m S 0.0 0.0 0:00.01 sshd
20529 root 20 0 103.2m 6.4m 5.4m S 0.0 0.0 0:00.05 sshd
16813 b+ 20 0 21.9m 6.4m 3.3m S 0.0 0.0 0:00.19 bash
5380 b+ 20 0 21.0m 5.4m 3.2m S 0.0 0.0 0:00.05 bash
1190 root 20 0 59.9m 4.8m 4.7m S 0.0 0.0 0:00.02 sshd
16812 b+ 20 0 103.2m 4.7m 3.7m S 0.0 0.0 0:00.29 sshd
20618 b+ 20 0 103.2m 4.7m 3.6m S 0.0 0.0 0:00.12 sshd
31906 postgres 20 0 103.5m 4.6m 2.3m S 0.0 0.0 0:00.42 postgres
2340 ntp 20 0 30.7m 4.3m 3.7m S 0.0 0.0 0:23.77 ntpd
