Check out my new course Learn you some Lambda best practice for great good! and learn the best practices for performance, cost, security, resilience, observability and scalability.
Quite some time ago I was asked to cover a C# developer interview for one of my neighbouring teams, and on the sheet of questions the original interviewer wanted me to ask was this question:
Q. Why should you NEVER use delegates?
I thought: “Well, at least I can rule myself out for the role!”
To my mind, if using delegates complicates your code or make it less readable/maintainable then you shouldn’t use it, but to say NEVER to using delegates? It just doesn’t make sense…
Puzzled, I asked: “Why not?”
“Because it’s an order of magnitude slower than using methods”
Sounds like he’s had his fingers burnt in the past, but still, it goes against everything I have experienced with using delegates..
“At least it is in the case of .Net 1.1”
Ahh, a little more context makes it that much more believable! But mind you, this was 2009 and .Net 3.5 had been out and surely whatever performance issue with delegates would have been fixed long along…
So, some two years later, I decided to put together a quick test to see if there is any difference in performance between invoking a delegate and a method in C# 4. The test is simple, given an empty delegate and method (see below), invoking each 10000 times in a row, which would take longer?
It’s worth noting that the test code is run in a debug, non-optimized (so no compiler in-lining) build.
Somewhat surprisingly, invoking delegates proved to be faster, averaging 269 ticks over 5 runs, where as invoking methods took an average of 365 ticks!
I specialise in rapidly transitioning teams to serverless and building production-ready services on AWS.
Are you struggling with serverless or need guidance on best practices? Do you want someone to review your architecture and help you avoid costly mistakes down the line? Whatever the case, I’m here to help.
Check out my new course, Learn you some Lambda best practice for great good! In this course, you will learn best practices for working with AWS Lambda in terms of performance, cost, security, scalability, resilience and observability. Enrol now and enjoy a special preorder price of £9.99 (~$13).
Are you working with Serverless and looking for expert training to level-up your skills? Or are you looking for a solid foundation to start from? Look no further, register for my Production-Ready Serverless workshop to learn how to build production-grade Serverless applications!
Here is a complete list of all my posts on serverless and AWS Lambda. In the meantime, here are a few of my most popular blog posts.
- Lambda optimization tip – enable HTTP keep-alive
- You are thinking about serverless costs all wrong
- Many faced threats to Serverless security
- We can do better than percentile latencies
- I’m afraid you’re thinking about AWS Lambda cold starts all wrong
- Yubl’s road to Serverless
- AWS Lambda – should you have few monolithic functions or many single-purposed functions?
- AWS Lambda – compare coldstart time with different languages, memory and code sizes
- Guys, we’re doing pagination wrong