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Using New Relic to Monitor WordPress Performance

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This post is part of a series called Performance Monitoring With New Relic.
Front-End Monitoring with New Relic Browser
Using New Relic to Monitor Your Servers
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What You'll Be Creating

If you arrived here from the Optimizing WordPress with Varnish and W3 Total Cache tutorial, you already have a pretty well optimized WordPress installation. If not, you may want to go back and review our guide to Varnish and W3TC. 

We're going to show you how to use New Relic's free server monitoring to see within your WordPress and PHP stack.

What's New Relic?

New Relic is a performance monitoring service which runs with a variety of server and language technologies, including PHP, which makes it great for optimizing WordPress.

W3TC provides built-in integration with New Relic's PHP monitoring daemon - so you can track performance on your WordPress stack at a deeper level. This can help monitor and diagnose unexpected slowdowns that might be related to your server performance, a slow theme, plugin, database query, third-party API or more.

If you're curious about what goes into a high performing WordPress site, read this guide to WordPress optimization written by the creator of W3TC, Frederick Townes.  

When you run New Relic on your server, you can get detailed performance monitoring graphs and statistics about your server and PHP including: response time, Apdex score (the ratio of satisfactory response times to unsatisfactory response times), throughput (requests per minute), web transactions e.g. third-party API requests, error rate, recent events and server information.

How to Install New Relic

For WordPress, I recommend signing up for a free trial account at the New Relic W3TC partnership page. However, you can also sign up at NewRelic.com:

Sign up for New Relic

Depending on where you sign up and what you install, you will have different features exposed by default in New Relic.

Once you've completed registration, follow the installation instructions on the Debian Ubuntu-based systems page appropriate for your registration (by the way, I'm running WordPress at DigitalOcean on Ubuntu 14.04).

Follow the instructions for your particular platform

1. Add the New Relic apt repository:

Trust the New Relic GPG key:

Update and local package list and install New Relic:

2. Install the New Relic System Monitor:

If you're using the W3TC New Relic setup, it will be:

If you're using the standard New Relic setup, it will be:

3. Configure and Launch the New Relic System Monitor:

If you're using the W3TC setup, it will have asked you for your license key. If you're using the generic New Relic setup, do this:

Start the New Relic daemon:

Whichever approach you use, restart your web server:

After a few minutes, you should see the red message on the setup page indicating that data is flowing into New Relic from your server. Cool, huh?

Data is arriving WooT

If you run into any problems, review the detailed PHP installation instructions or visit the New Relic troubleshooting page.

You'll see something likes this once data starts coming in:

Initial New Relic Server insights

Activate New Relic within W3 Total Cache

If you're using the W3TC integration, you'll need to visit your New Relic Account Settings to get your license key again and also create an API key. Click the Integrations -> Data Sharing tabs to enable the API and get your key.

Activate the API key and get your key

Then, from your WordPress Administration Console, click Performance -> Monitoring. Click sign up for a free account. Copy the details for your API and license key.

Enter your New Relic API and license key in W3TC settings

Enabling New Relic on your server provides for monitoring from the W3TC dashboard, such as shown below:

The W3TC New Relic Dashboard

Monitoring Your WordPress Performance

New Relic is useful for evaluating WordPress performance in three key ways:

  1. Monitoring MySQL performance. Poorly written themes or plugins can definitely harm performance. Or, as your site grows, native WordPress queries may slow it down. 
  2. Apdex gives you a quantitative measurement of the usability experiences of your site based on response time.
  3. Monitoring the performance of third party plugins and APIs. WordPress offers a powerful array of plugins and services to add to your blog, but some can kill performance. New Relic can help you identify problem areas.

Again, depending on your configuration in New Relic, you'll see the W3TC partnership dashboard for monitoring a PHP application:

NewRelic W3TC Dashboard Panel

Or, you'll see the four tabs that summarize your server's performance:

First, the Overview tab offers insights into CPU, memory usage, disk and network I/O, and load as well as information about your hardware and most active processes: 

Overview

Next, the Process tab shows you the memory and CPU utilization of each process:

Look at Memory and CPU utilization by process

Thirdly, the Network tab

Then there is the Disk tab

With the W3TC installation, you can monitor transactions showing the most requested PHP scripts:

Top transactions

You'll also be able to monitor your MySQL database:

Monitor performance of database queries

You can also install plugins for any service you want to monitor:

Add plugins for the services you wish to monitor

Diving deeper into New Relic requires an investment of time, but the results are well worth it. With this tool, can you see inside your WordPress stack to quickly pick out problem areas that need addressing.

Looking Ahead

While you can use New Relic Lite forever, once your two week trial expires, you might want to upgrade to the Pro plan ($149/month) to keep the same levels of service.

It's also important to occasionally update New Relic and check on its log files. Review the New Relic maintenance guide.

If you have any questions or corrections, please post them in the comments. If you'd like to keep up on my future Tuts+ tutorials and other series, please visit my author page or follow @reifman.

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