Hello,<div><br></div><div>I have seen a lot peaks on the CPU LOAD of my nagios machine (See pnp4nagios graphs on pdf document attached).</div><div><br></div><div>I don´t know which process/processes are the ones that use too much CPU on that periods because the PC is only used for Nagios (And plugins used with it) and all the plugins defined have a check_period of 1 minute and there is a lot of periods where the load is near to 0 (so what happens every 2 hours more or less that use so much CPU???)</div> <div><br></div><div>I have tried to find the process that causes this behavior with the "top" command but %Cpu idle is always (also on the peaks of the CPU LOAD) more han 70% and no process uses more than 4% of CPU (See three examples of TOP command where %CPU idle is always high but Load vary a lot on each case)</div> <div><div><br></div><div>******************************************************************</div><div><div>top - 11:52:27 up 9:51, 1 user, <b>load average: 0.09, 0.56, 0.62</b></div><div>Tasks: 102 total, 1 running, 101 sleeping, 0 stopped, 0 zombie</div> <div><b>Cpu(s):</b> 7.9%us, 1.5%sy, 0.0%ni, <b>88.4%id</b>, 1.0%wa, 0.3%hi, 0.8%si, 0.0%st</div><div>Mem: 2050176k total, 675704k used, 1374472k free, 132628k buffers</div><div>Swap: 2096472k total, 0k used, 2096472k free, 333384k cached</div> </div><div><br></div><div>top - 13:30:05 up 11:29, 2 users, <b>load average: 1.53, 1.27, 0.83</b></div></div><div><div>Tasks: 110 total, 3 running, 107 sleeping, 0 stopped, 0 zombie</div><div><b>Cpu(s):</b> 9.2%us, 1.5%sy, 0.0%ni,<b> 88.6%id</b>, 0.0%wa, 0.0%hi, 0.7%si, 0.0%st</div> <div>Mem: 2050176k total, 708540k used, 1341636k free, 139020k buffers</div><div>Swap: 2096472k total, 0k used, 2096472k free, 334668k cached</div></div><div><br></div><div><div>top - 13:16:39 up 1 day, 11:15, 2 users, <b>load average: 2.45, 2.03, 1.96</b></div> <div>Tasks: 106 total, 1 running, 105 sleeping, 0 stopped, 0 zombie</div><div><b>Cpu(s)</b>: 7.8%us, 1.4%sy, 0.0%ni, <b>89.1%id</b>, 1.0%wa, 0.2%hi, 0.5%si, 0.0%st</div><div>Mem: 2050176k total, 845668k used, 1204508k free, 167244k buffers</div> <div>Swap: 2096472k total, 0k used, 2096472k free, 351224k cached</div></div><div><br></div><div><br></div><div><br></div><div><br></div><div>********************************************************************</div> <div><br></div><div><br></div><div>Is there some way to find wich process cause this high CPU LOAD ? (Which proccess use sometimes a lot of the CPU time so queuing other processes). Why sometimes the CPU Load is near to 0 and other times Load_1_min is near to 4 (On the example 2,45 but there are higher values) if the processes are always the same ???</div> <div><br></div><div>Thank you very much</div><div><br></div><div>*****************************************************************************</div><div><br></div><div>Environment Description.</div><div><br></div><div>Intel Core 2 DUO E7500 / 2,93GHz</div> <div>DDR2 2GB / 667MHz</div><div>Centos 5.5</div><div>Nagios 3.2.3</div><div>nagios-plugins-1.4.11</div><div>net-snmp-5.6</div><div>snmptt-1.3</div><div>mklivestatus-1.1.8</div><div>nagvis-1.5.6</div><div>pnp4nagios-0.6.10</div>