Are there any tools that can be used to check memory utilization?

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环境

• Red Hat Enterprise Linux 4
• Red Hat Enterprise Linux 5
• Red Hat Enterprise Linux 6

问题

• System is facing high memory utilization, what are the tools that can be used to view it?

决议

Following commands can be used to see the memory utilization:

• Report usage of each prosess's VIRT (virtual memory size) and RSS (resident set size.) Raw
  # ps aux
  
• Report short summary of memory utilization statistics. Raw
  # free
  
• Report details of memory utilization statistics. Raw
  # cat /proc/meminfo
  
• Report details of slab utilization statistics. Raw
  # cat /proc/slabinfo
  
• Report virtual memory statistics. Raw
  # vmstat
  
• Report virtual memory statistics iteratively (the example's sampling is 5 seconds.) Raw
  # vmstat 5
  
• Report memory and swap space utilization statistics iteratively (the example's sampling is 5 seconds and, count is 10.) Raw
  # sar -r 5 10
  

Comments

Refer man pages for more information.

​​Raw​​

*   PS(1) (\`man ps\`)
*   FREE(1) (\`man free\`)
*   PROC(5) (\`man proc\`)
*   SLABINFO(5) (\`man slabinfo\`)
*   VMSTAT(8) (\`man vmstat\`)
*   SAR(1) (\`man sar\`)