New Release: Memory Bloat Detection

By Derek Bullet_white Posted in Features Bullet_white Comments Comments

When your app is experiencing memory bloat - a sharp increase in memory usage due to the allocation of many objects - it's a particularly stressful firefight.

Slow performance is one thing. Exhausting all of the memory on your host? That can bring your application down.

Memory bloat is a scary problem: our 2.0 release of the Scout agent aims to track down memory hotspots as easy as performance bottlenecks.

Read on: I'll share what's hard about memory bloat detection, Scout's approach, and some further reading.

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Faster PostgreSQL Searches with Trigrams

By Greg Bullet_white Comments Comments

There's nothing quite like having a "tool-belt" full of tricks for getting the most performance out of your Rails app. This week, Rails Postgres Guru Greg Navis shares another powerful tip.

A few months ago, I was working on a project that had about 100,000 users. Each user could have multiple names, emails, phone numbers and addresses associated with his account. All these objects totaled to about 500,000 database rows. Customer support staff would search this dataset multiple times a day. One day, they started seeing timeouts.

In this article, I'll show you how I sped things up with the PostgreSQL trigram extension.

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A Six-Pronged Rails Performance Philosophy

By Sudara Bullet_white Posted in Plugins Bullet_white Comments Comments

"An ounce of prevention is worth a pound of cure.” ― Benjamin Franklin

Application performance problems can be annoying. With luck, you'll spend an hour or two resolving the problem and get back to your real job: building things.

But what happens when the issues start piling up? What happens when "poor performance" becomes the norm?

When looking at performance issues in aggregate and cross-application, a deeper root cause can appear. This can be tough for a team to identify and even tougher to act upon.

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Product Update: enhanced zoom, 95th percentiles, trace diffs, and more.

By Derek Bullet_white Comments Comments

Today we're excited to announce the release of our latest Ruby on Rails monitoring agent and a major UI update. This release continues our focus on quickly revealing your path to a faster, more reliable Rails app.

Enhanced zoom

Determining how to make your Rails app faster often involves investigating the opposite: inspecting your app's worst performing controller-actions and their requests. We're working to make this investigation effortless. Just follow your intuition when you see a problem area on a chart:


Click-and-drag on the chart to reveal a list of endpoints we've collected detailed transactions traces for during that period. For context, you'll see a sparkline of each endpoint's response time. Sort by slowest response time or largest memory increase.

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3 pleasantly surprising PostgreSQL Indexing tricks

By Greg Bullet_white Comments Comments

Most Rails engineers know the basics of database performance. They know that if a query is slow, an index may be the solution. Some know the trade-offs between having and not having an index. Or why an index on a low-cardinality column might not help. But everyone is surprised when I show them a few more advanced indexing techniques. The only response I get is Wow, I didn't know that's possible! In this article, I'll show you 3 techniques that render this kind of response.

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Rails Performance and the root of all evil

By Sudara Bullet_white Comments Comments

Donald Knuth wrote an often quoted paper in the 70s which is still referenced when talking about performance in web apps today.

Premature optimization is the root of all evil.

In my line of work, it is sometimes invoked as a sort of apology; an excuse for why more time wasn't spent on performance: "This sucks, but at least we didn't.....prematurely optimize!"

My job is to fix performance issues and help other developers write well-performing code, so I'm not a huge fan of this quote. We shouldn't let an out of context quote guide our development strategy, no matter the source!

When things bother me, I like to stop to take a closer look. Here's the full quote:

We should forget about small efficiencies, say about 97% of the time: premature optimization is the root of all evil.

I translate this to: "When optimizing, don't get distracted by things that don't matter."

I would never translate this to: "Hold off on optimizing things until it really hurts."

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