FlameGraph Htop — Benchmarking CPU— Linux
< MEDIUM: https://raaki-88.medium.com/flamegraph-htop-benchmarking-cpu-linux-e0b8a8bb6a94 >
I have written a small post on what happens at a Process-Level, now let’s throw some flame into it with flame-graphs
Am a fan of Brendan Gregg’s work and his writings and flame graph tool are his contribution to the open-source community —
https://www.brendangregg.com/flamegraphs.html
Before moving into Flamegraph, let’s understand some Benchmarking concepts.
Benchmarking in general is a methodology to test resource limits and regressions in a controlled environment. Now there are two types of benchmarking
- Micro-Benchmarking — Uses small and artificial workloads
- Macro-Benchmarking — Simulates client in part or total client workloads
Most Benchmarking scenario results boil down to the price/performance ratio. It can slowly start with an intention to provide proof-of-concept testing to test application/system load to identify bottlenecks in the system for troubleshooting or enhancing the system or to know about the maximum stress system simply is capable of taking.
Enterprise / On-premises Benchmarking: let’s take a simple scenario to build out a data centre which has huge racks of networking and computing equipment. As Data-centre builds are mostly identical and mirrored, benchmarking before going for Purchase-order is critical.
Cloud-based Benchmarking: This is a really in-expensive setup. While Continue reading
BGP Unnumbered Duct Tape
Every time I mention unnumbered BGP sessions in a webinar, someone inevitably asks “and how exactly does that work?” I always replied “gee, that’s a blog post I should write one of these days,” and although some readers might find it long overdue, here it is ;)
We’ll work with a simple two-router lab with two parallel unnumbered links between them. Both devices will be running Cumulus VX 4.4.0 (FRR 8.4.0 container generates almost identical printouts).
BGP Unnumbered Duct Tape
Every time I mention unnumbered BGP sessions in a webinar, someone inevitably asks “and how exactly does that work?” I always replied “gee, that’s a blog post I should write one of these days,” and although some readers might find it long overdue, here it is ;)
We’ll work with a simple two-router lab with two parallel unnumbered links between them. Both devices will be running Cumulus VX 4.4.0 (FRR 8.4.0 container generates almost identical printouts).
Terminator 1 is the best Terminator movie
And now for something completely different.
I’ve off and on thought about this for years, so it needed to be written down.
Terminator 1 is the best Terminator movie
Obviously SPOILERS, for basically all Terminator movies.
Summary of reasons
- The robot is really not human.
- It’s a proper time loop, with a bonus that none of the players in the movie know it.
I’m aware of The Terminator Wiki, but I don’t care about it. My opinions are on the movies as movies.
The behavior of the terminator
In Terminator 1 (T1) Arnold is clearly a robot in human skin. At no point do you believe it’s a human. The only reason people don’t stop and scream and point, is that “I’m being silly, that’s clearly impossible”. But Arnold spends the whole movie in the uncanny valley, the kind in 2022 reserved for realistically generated CGI characters.
It’s very nearly a perfect movie. Just take his first dialog. “Nice night for a walk”, the punks say. They are saying this to a machine that has never talked to a human before, so its response is complete nonsense. It just repeats the words back to them.
It’s a Continue reading
Network Break 407: VMware Buys Startup For SD-WAN Client; Zoom Meetings At The Movies?
This week's Network Break covers several announces from VMware Explore including a new SD-WAN client. ASIC-maker Marvell goes after industrial networks with new silicon, Cisco announces the curtain falling on several ISR router models, and SolarWinds settles with the SEC. Zoom and the AMC movie theater chain partner on an offering to hold big meetings at the movies, and Starlink announces it will slow customer speeds if they cross a 1TB cap.
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Network Break 407: VMware Buys Startup For SD-WAN Client; Zoom Meetings At The Movies?
This week's Network Break covers several announces from VMware Explore including a new SD-WAN client. ASIC-maker Marvell goes after industrial networks with new silicon, Cisco announces the curtain falling on several ISR router models, and SolarWinds settles with the SEC. Zoom and the AMC movie theater chain partner on an offering to hold big meetings at the movies, and Starlink announces it will slow customer speeds if they cross a 1TB cap.Mean Time to Innocence is not Enough
A long time ago, I supported a wind speed detection system consisting of an impeller, a small electric generator, a 12 gauge cable running a few miles, and a voltmeter. The entire thing was calibrated through a resistive bridge–attach an electric motor to the generator, run it at a series of fixed speed, and adjust the resistive bridge until the voltmeter, marked in knots of wind speed, read correctly.
The primary problem in this system was the several miles of 12 gauge cable. It was often damaged, requiring us to dig the cable up (shovel ready jobs!), strip the cable back, splice the correct pairs together, seal it all in a plastic container filled with goo, and bury it all again. There was one instance, however, when we could not get the wind speed system adjusted correctly, no matter how we tried to tune the resistive bridge. We pulled things apart and determined there must be a problem in one of the (many) splices in the several miles of cable.
At first, we ran a Time Domain Reflectometer (TDR) across the cable to see if we could find the problem. The TDR turned up a couple of hot spots, Continue reading
Play To Your Team Strengths
This past weekend I went to a training course for an event that I’m participating in next year. One of the quotes that came up during the course was about picking the team that will help you during the event. The quote sounded something like this:
Get the right people on the right bus in the right seats and figure out where you want to go.
Sounds simple, right? Right people, right bus, right seats. Not everyone is going to be a good fit for your team and even if they are they may not be in the right position to do their best work. But how do you know what they’re good at?
Not-So-Well Rounded
Last night, I listened to this excellent Art of Network Engineering episode. The guest was a friend of mine in the industry, Mike Bushong (@MBushong). He’s a very talented person and he knows how to lead people. He’s one of the people that would love to work for given the opportunity. He’s also very astute and he has learned a lot of lessons about enabling people on a team.
One of the things he discussed in the episode was about people’s strengths. Continue reading
Technology Management is the Foundation for Successful Digital Transformation
Proper IT asset management is the secret to overcoming the complexity and scaling pitfalls of a digital transformation.Welcome to the Supercloud (and Developer Week 2022)
In Cloudflare’s S-1 document there’s a section that begins: “The Internet was not built for what it has become”.
That sentence expresses the idea that the Internet, which started as an experiment, has blossomed into something we all need to rely upon for our daily lives and work. And that more is needed than just the Internet as was designed; it needed security and performance and privacy.
Something similar can be said about the cloud: the cloud was not designed for what it must become.
The introduction of services like Amazon EC2 was undoubtedly a huge improvement on the old way of buying and installing racks and racks of servers and storage systems, and then maintaining them.
But by its nature the cloud was a virtualization of the older real world infrastructure and not a radical rethink of what computing should look like to meet the demands of Internet-scale businesses. It’s as if steam locomotives were replaced with efficient electric engines but still required a chimney on top and stopped to take on water every two hundred miles.
The cloud replaced the rituals of buying servers and installing operating systems with new and now familiar rituals of choosing regions, and Continue reading
The road to a more standards-compliant Workers API
Earlier this year, we announced our participation in a new W3C Community Group for the advancement of Web-interoperable API standards. Since then, this new WinterCG has been hard at work identifying the common API standards around which all JavaScript runtimes can build. Today I just want to give a peek at some work the WinterCG has been doing; and show off some of the improvements we have been making in the Workers runtime to increase alignment with Web Platform standards around event handling, task cancellation using AbortController, text encoding and decoding, URL parsing and pattern matching, and streams support.
The WinterCG Minimum Common Web Platform API
Right at the start of the WinterCG activity, the group took some time to evaluate and compare the various non-browser JavaScript runtimes such as Node.js, Deno, Bun, and Workers with the purpose of identifying the Web Platform APIs they all had in common. Following a very simple criteria, we looked at the standard APIs that were already implemented and supported by at least two of these runtimes and compiled those into a list that the WinterCG calls the "Minimum Common Web Platform API". This list will serve as Continue reading
Build applications of any size on Cloudflare with the Queues open beta
Message queues are a fundamental building block of cloud applications—and today the Cloudflare Queues open beta brings queues to every developer building for Region: Earth. Cloudflare Queues follows Cloudflare Workers and Cloudflare R2 in a long line of innovative services built for the Workers Developer Platform, enabling developers to build more complex applications without configuring networks, choosing regions, or estimating capacity. Best of all, like many other Cloudflare services, there are no egregious egress charges!
If you’ve ever purchased something online and seen a message like “you will receive confirmation of your order shortly,” you’ve interacted with a queue. When you completed your order, your shopping cart and information were stored and the order was placed into a queue. At some later point, the order fulfillment service picks and packs your items and hands it off to the shipping service—again, via a queue. Your order may sit for only a minute, or much longer if an item is out of stock or a warehouse is busy, and queues enable all of this functionality.
Message queues are great at decoupling components of applications, like the checkout and order fulfillment services for an ecommerce site. Decoupled services are easier to reason about, Continue reading
Cloudflare Workers scale too well and broke our infrastructure, so we are rebuilding it on Workers
While scaling our new Feature Flagging product DevCycle, we’ve encountered an interesting challenge: our Cloudflare Workers-based infrastructure can handle way more instantaneous load than our traditional AWS infrastructure. This led us to rethink how we design our infrastructure to always use Cloudflare Workers for everything.
The origin of DevCycle
For almost 10 years, Taplytics has been a leading provider of no-code A/B testing and feature flagging solutions for product and marketing teams across a wide range of use cases for some of the largest consumer-facing companies in the world. So when we applied ourselves to build a new engineering-focused feature management product, DevCycle, we built upon our experience using Workers which have served over 140 billion requests for Taplytics customers.
The inspiration behind DevCycle is to build a focused feature management tool for engineering teams, empowering them to build their software more efficiently and deploy it faster. Helping engineering teams reach their goals, whether it be continuous deployment, lower change failure rate, or a faster recovery time. DevCycle is the culmination of our vision of how teams should use Feature Management to build high-quality software faster. We've used DevCycle to build DevCycle, enabling us to implement continuous deployment successfully.
DevCycle Continue reading
Introduction to Cloud Development Kit for Terraform
Cloud Development Kit for Terrafrom or CDKTF as it is commonly referred to is a tool kit that allows you to leverage the advantages of Terrafrom from within a high-level programming language such as TypeScript, Python, Java, C#, or Go. CDKTF automatically extracts the schema from Terraform providers and modules to generate the necessary classes for your application. We can use CDKTF with every provider that is avaiable on the Terrafrom registry.
In this post, we will look at an example of using CDKTF with Python to provision resources on a Palo Alto Networks Panorama. I chose a Palo Alto Networks Panorama as the target here because I am from a network engineering background.
Installation
Hashicorp have well documented steps on how you can install CDKTF and can be found here.
Getting Started
Initialise a new Project
Once we have successfully installed CDKTF and verified our installation, we begin by initialising a cdktf project with an appropriate template. Here, we are using Python as our template.
cdktf init --template=python --local --project-name cdktf-post --project-description A-simple-projectInitialise a new CDKTF project
Once the initialiation has been completed, you will notice that several new files and folders are created. The main.py file Continue reading