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  1. ZABBIX BUGS AND ISSUES
  2. ZBX-17917

"vm.memory.size[available]" on Solaris shows supposedly wrong values

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    • Team:
      Team A
    • Sprint:
      Sprint 65 (Jun 2020), Sprint 66 (Jul 2020)
    • Story Points:
      2

      Description

      On Solaris OS, key "vm.memory.size[available]" shows very different numbers (much less) if compare with "top" or "vmstat" command line tool.

      :/opt/zabbix/sbin# ./zabbix_agentd -t 'vm.memory.size[available]'
      vm.memory.size[available] [u|1418600448]
      
      :/opt/zabbix/sbin# ./zabbix_agentd -t 'vm.memory.size[free]'
      vm.memory.size[free] [u|1418600448]
      
      :/opt/zabbix/sbin# ./zabbix_agentd -t 'vm.memory.size[used]'
      vm.memory.size[used] [u|20056236032]
      
      
      load averages: 3.46, 3.84, 3.98; up 35+02:34:54 11:46:05
      110 processes: 109 sleeping, 1 on cpu
      CPU states: 93.6% idle, 5.6% user, 0.9% kernel, 0.0% iowait, 0.0% swap
      Memory: 20G phys mem, 7381M free mem, 40G total swap, 10G free swap
      

      If I understand correctly,  in code of zabbix agent, "free" and "available" actually should return identical values.

      static int	VM_MEMORY_AVAILABLE(AGENT_RESULT *result)
      {
      	SET_UI64_RESULT(result, (zbx_uint64_t)sysconf(_SC_AVPHYS_PAGES) * sysconf(_SC_PAGESIZE));
      

      So, we perform syscall to "sysconf" function, providing _SC_AVPHYS_PAGES as parameter.
      It's described here
      https://docs.oracle.com/cd/E26502_01/html/E29034/sysconf-3c.html

      This is one more data collection on the same host:


      Not sure who is wrong - zabbix agent or top, vmstat tools.

      SunOS XXXXXXXXXX 5.10 Generic_150400-61 sun4v sparc sun4v
      We tried agent version 5.0.1

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        1. TOP-1.png
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        2. VMSTAT.png
          VMSTAT.png
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        3. ZABBIX.png
          ZABBIX.png
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              Assignee:
              wiper Andris Zeila
              Reporter:
              zalex_ua Oleksii Zagorskyi
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                Created:
                Updated:
                Resolved: