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| linuxperf [2024/11/30 09:42] – [CPU] dani | linuxperf [2024/11/30 12:27] (current) – [Get on Top of it] admin |
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| Linux's top command provides a wealth of troubleshooting information, but you have to know what you're looking for. Reference this diagram as you go through the steps below: | Linux's top command provides a wealth of troubleshooting information, but you have to know what you're looking for. Reference this diagram as you go through the steps below: |
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| {{:images:top.png?direct&400|Top output}} | {{:images:top.png?direct&600|Top output}} |
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| ==== Step 1: Check I/O wait and CPU idletime ==== | ==== Step 1: Check I/O wait and CPU idletime ==== |
| Low swap means you have a "real" IO wait problem. The next step is to see what's hogging your IO. | Low swap means you have a "real" IO wait problem. The next step is to see what's hogging your IO. |
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| {{:images:iotop.png?direct&400|}} | {{:images:iotop.png?direct&600|}} |
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| ''%%iotop%%'' is an awesome tool for identifying io offenders. | ''%%iotop%%'' is an awesome tool for identifying io offenders. |
| ==== CPU ==== | ==== CPU ==== |
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| {{:images:cpuusage.png?direct&400|Icinga CPU usage}} | {{:images:cpuusage.png?direct&600|Icinga CPU usage}} |
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| {{:images:iowaits.png?direct&400|Icinga I/O waits}} | {{:images:iowaits.png?direct&600|Icinga I/O waits}} |
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| {{:images:blockedpocesses.png?direct&400|Icinga blocked processes}} | {{:images:blockedpocesses.png?direct&600|Icinga blocked processes}} |
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| ==== Network ==== | ==== Network ==== |
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| {{:images/netusage.png| Icinga network usage}} | {{:images:netusage.png?direct&600| Icinga network usage}} |
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