What is normal iowait?

iowait is simply a form of idle time when nothing could be scheduled. The value may or may not be useful in indicating a performance problem, but it does tell the user that the system is idle and could have taken more work. Comments: A CPU can be in one of four states: user, sys, idle, or iowait.

What causes iowait?

iowait is time that the processor/processors are waiting (i.e. is in an idle state and does nothing), during which there in fact was outstanding disk I/O requests. This usually means that the block devices (i.e. physical disks, not memory) is too slow, or simply saturated.

What does CPU iowait mean?

I/O wait (iowait) is the percentage of time that the CPU (or CPUs) were idle during which the system had pending disk I/O requests.

What is IOPS mysql?

The innodb_io_capacity variable defines the overall I/O capacity available to InnoDB . It should be set to approximately the number of I/O operations that the system can perform per second (IOPS).

How do you troubleshoot iowait?

Troubleshoot high iowait issue on Linux

  1. Check Disk IO Performance on Linux.
  2. Check NFS IO performance issue on Linux.
  3. High iowaits on specific CPU cores.

How do I get iowait issues?

Quick Guide to Fix Linux IOWait Issue

  1. What is Linux IO wait?
  2. Determine if an IO problem is causing the system to slow.
  3. Find which disk is being written.
  4. Find processes that cause high IO wait.
  5. Find which file caused the iowait.

How do I monitor MySQL performance?

Top 6 Tools to Monitor MySQL Databases

  1. Sematext MySQL Monitoring. Sematext is a full-stack observability solution MySQL monitoring capabilities.
  2. Percona Monitoring and Management Tool (PMM)
  3. VividCortex MySQL Analyzer.
  4. MySQL Enterprise Monitor.
  5. Datadog MySQL.
  6. Prometheus and MySQLD Exporter.

How do I restrict my CPU usage?

The easiest solution I found is to limit Processor power.

  1. Go to Control Panel.
  2. Hardware and sound.
  3. Power options.
  4. Edit plan settings.
  5. Change advanced power settings.
  6. Processor power management.
  7. Maximum processor state and lower it to 80% or whatever you want.

How do you control CPU usage?

Let’s go over the steps on how to fix high CPU usage in Windows* 10.

  1. Reboot. First step: save your work and restart your PC.
  2. End or Restart Processes. Open the Task Manager (CTRL+SHIFT+ESCAPE).
  3. Update Drivers.
  4. Scan for Malware.
  5. Power Options.
  6. Find Specific Guidance Online.
  7. Reinstalling Windows.