Knowledge Base

Resource limit information

A2 Hosting's shared and reseller hosting servers run CloudLinux. CloudLinux monitors and regulates account resource usage to help improve server performance and stability.

For detailed information about which resources CloudLinux monitors and regulates, please see this article.

cPanel enables you to view detailed information about problematic processes and database queries running on your account. This information is very helpful for determining why a CloudLinux resource limit was triggered.

Viewing resource limit information

To view resource limit information for your account, follow these steps:

  1. Log in to cPanel.
    If you do not know how to log in to your cPanel account, please see this article.
  2. In the METRICS section of the cPanel home screen, click CPU and Concurrent Connection Usage:

    cPanel - Metrics - CPU usage

    This option is only available with the Paper Lantern theme in cPanel. For information about how to change the cPanel theme for your account, please see this article.
  3. On the Resource Usage Overview page, cPanel displays a summary for your account. Depending on your account's resource usage, you may see:

    • Your site had no issues in the past 24 hours: If you receive this message, your account did not trigger any limits within the past 24 hours.
    • Your site has been limited within the past 24 hours: If you receive this message, your account triggered at least one resource limit within the past 24 hours. cPanel displays additional information about which resource (or resources) triggered the limit.
    • Your site might hit resource limits soon: This message is a warning that your account may trigger resource limiting in the near future. cPanel displays additional information about which resource is at risk of triggering a limit.
  4. To view detailed resource usage information for your account, click [Details]. cPanel displays usage graphs and a usage table:

    • By default, cPanel displays resource usage information for the past 24 hours. To change the time interval displayed, in the Timeframe list box, select the interval you want, and then click Submit.
  5. To view resource usage snapshots, click [Snapshots]. Depending on your account's resource usage, cPanel may display a list of processes and a list of database queries:

    • In the calendar, select the date you want to view.
    • In the Choose snapshot list box, you can select the snapshot for the specific time you want to view:

      cPanel - CPU resource limit - Choose snapshot

    • To move to the previous snapshot, click Previous snapshot. To move to the next snapshot, click Next snapshot.
    For tips about how to interpret resource usage snapshots, please see the following section for an example.

Snapshot example

Let's look at an actual limiting scenario and see how snapshots help troubleshoot the problem. In this example, an account has had its CPU resources limited sometime within the past 24 hours:

cPanel - CPU resource limit overview

To view additional information about the resource limiting, as well as when it occurred, we click [Snapshots]. The following page appears:

cPanel - CPU resource limit snapshot

Under Process List, we see the following information:

  • PID: This is the process ID.
  • CMD: This is the actual command that the process ran.
  • CPU: This is the CPU usage for the process. In this case, bad_script.php exceeded CPU capacity twice (102% and 101%).
  • MEM: This is the amount of memory used by the process, in megabytes.

From this information, we can determine that the PHP script bad_script.php has some sort of problem that causes it to use a large amount of CPU capacity.

In this example, the Database Queries Snapshot section does not contain any data, but if an account triggers MySQL limits, cPanel displays the problematic query (or queries).

More Information

To view the official CloudLinux documentation for server process snapshots, please visit http://docs.cloudlinux.com/index.html?server_processes_snapshots_2.html.