What’s New With Kernl – February 2019

February was a pretty busy month for Kernl! We had a lot of great tweaks to load testing, a few customer feature improvements, and some infrastructure work. Lets get started!

Features & Bugs

  • Multi-Region Load Tests – You can now select multiple regions for your WordPress load tests! Instead of having all traffic come from a single region you can have it evenly distributed across all the available regions. This is useful for testing if you have a global audience.
  • Load Testing Enters General Availability – Kernl’s WordPress load testing is now available for all customers.
  • Delete Load Tests – You are now able to delete your load tests.
  • License Max Version Bug – A customer brought to our attention that the “max_version” field behavior wasn’t quite right. This has been resolved.
  • Customer Card Expiration Cron Job Bug – We recently discovered that the cron job that checks to see if a customer has paid their invoice was broken. This was going on for about 5 months, so some of you may have received you Kernl subscription for free during that time period. 😉
  • Multiple License Domains – If you use our license management system and restrict via domains, you can now enter multiple domains on a per-license basis. This is useful if you want to use the same license for local, staging, and production.
  • License Management UI Updates – We’ve simplified the list view in license management by removing some columns that were cluttering the screen. We’ve also lined up the action buttons better and will now notify you in the plugin/theme detail pages if you have license management enabled but no licenses associated with your product.

Infrastructure

  • The Kernl Analytics server was re-sized to be smaller. It was way over allocated.
  • Load testing was moved to a Kernl sub-domain. Prior to this it had a top-level domain.
  • Load testing servers that don’t come up after 3 minutes are removed from the load testing pool.
  • Session handling (for OAuth) has been moved to cookies. Prior to this we stored sessions in Redis.
  • We have removed our dependency on the ‘Q’ promise package on the Node.js app servers.

Blog Posts

Thats it for this month!

Measuring the Performance of WordPress on DigitalOcean Droplets

Earlier this year Kernl launched our WordPress Load Testing offering. Prior to the launch we had been doing a series of blog posts testing the performance of “managed” WordPress providers. In this blog post I’ll test the performance of Digital Ocean’s VPS solutions with a standard LEMP (Linux Nginx MySQL PHP-FPM) installation by scaling it vertically.

Want to measure your own WordPress performance under heavy load? Sign up for Kernl.

Server & WordPress Configuration

The Digital Ocean 1-click LEMP install is already configured to take full advantage of as many cores and as much RAM as is available. During the course of these tests I never needed to tweak any server settings. That doesn’t mean that more performance couldn’t have been extracted through configuration tweaks, but even with these settings we were able to gain useful information about WordPress performance on the different Digital Ocean droplet levels.

With regards to WordPress configuration… there isn’t any. No caching, CDNs, or compression. Just raw WordPress. Its easy to get high performance out of WordPress if you cache everything, but seeing what performance looks like in the worst-case scenario is far more interesting.

The Test

For this series of tests I imported the contents of my personal blog (Re-cycledair) to the target and then used Kernl to run the load tests. Due to the nature of my blog this test is very read heavy. While this isn’t realistic for everyone, for my personal blog the test is representative of the actual traffic that it receives.

The test itself looked like:

  • Concurrent users – 500
  • Ramp up – 2 users per second
  • Duration – 30 minutes
  • Request Rate – Each user makes 1 request every second
  • Droplet location – New York City
  • Load test generator location – Amsterdam

Results

As expected the amount of traffic that we could handle scaled linearly with the amount of hardware we were using (and cost).

Cost -vs- Performance

One interesting thing you’ll see in the graph is that in two places the requests per second actually trend down.

Data

Looking at the data above you can see that I tried Digital Ocean’s standard droplets as well as their CPU optimized droplets. The difference between them is cost and dedicated hyper-threads. From a cost perspective, you’re better off going with the standard droplet in the same price category. Personally I expected the CPU optimized droplet to perform better, but this might not be the best type of workload for it.

What About Caching?

Just for fun I tried out the one-click install of WordPress with LiteSpeed configured on a $5 / month droplet.

Things went really really really well.

🔥🔥🔥🔥🔥

Thats right. By the time the test was completed my little $5 / month droplet was receiving 1800 requests / second WITH NO ERRORS. For perspective, thats 4.6 billion requests per month.

Conclusions

The data does a good job speaking for itself here, but in general you should definitely stick to Digital Ocean’s standard droplets when running WordPress. Even without caching you can get really good performance out of the $40/month droplet.

Want to measure your own WordPress performance under heavy load? Sign up for Kernl.

Introducing WordPress Load Testing

In November 2018 Kernl launched the closed beta of our new WordPress load testing service. After a lot of changes based on the feedback we received we’re finally bringing WordPress Load Testing out of beta and into general availability.

Why Load Test?

There are a lot of different reasons to load test.

  • Infrastructure and Hosting – Kernl WordPress load testing gives you confidence that you are making the right decisions with your infrastructure and hosting. Looking to change hosts but aren’t sure how big or expensive of a plan you need? Run a load test.
  • Performance Testing – Load testing gives you confidence that the SQL query you just wrote isn’t going to collapse your website under load.
  • Confidence with your clients – Load testing lets you tell your clients with confidence that their new website can handle 100,000 visitors a day without any degradation in response time.
WordPress Load Testing graph
Load Test of Kernl Blog (horizontally scaled)

How Does It Work?

Kernl’s WordPress Load Testing solution makes load testing your WordPress site a breeze. You only need verify your ownership of the site with an easy to use WordPress plugin and then start testing. No coding or infrastructure management needed.

Start a load test in 1 minute

How Much Does it Cost?

Kernl’s WordPress Load Testing is included with your Kernl subscription. Usage per plan is as follows:

Plan TypeLoad TestsMax DurationMachine HoursRetention
Old Plans215 min55 days
Solo1060 min530 days
Agency30120 min3090 days
Enterprise &
Above
100300 min100365 days

If your needs don’t fit neatly into one of these categories feel free to reach out. We’d be happy to create a custom plan to suit your needs.

Sign Up Now

To get started with easy WordPress load testing, sign up for Kernl .