Brendan Gregg

SEPTEMBER 25, 2021

These strange questions came to the fore back in 2014 when Netflix was switching services from CentOS Linux to Ubuntu, and I helped debug several weird performance issues including one I'll describe here. A Cassandra database cluster had switched to Ubuntu and noticed write latency increased by over 30%. How would you _time_ time?

Speed 40

Speed Java AWS Virtualization 40

SQL Performance

APRIL 8, 2019

These VMs are not available in all regions, so you will want to check the availability in the Azure region that you are interested in using. As 128GB DDR4 DIMMs become more widely available that total capacity will double. They feature low latency, local NVMe storage that can directly leverage the 128 PCIe 3.0

Azure 42

Azure Virtualization Storage Benchmarking 42

Alex Russell

APRIL 29, 2021

This post mines publicly available data on the pace of compatibility fixes and feature additions to assess the claim. After 20 years of neck-in-neck competition, often starting from common code lineages, there just isn't that much left to wring out of the system. Count of APIs available from JavaScript by Web Confluence.

Media 145

Media Games Education Engineering 145

Brendan Gregg

JULY 2, 2021

This is also applicable for people adding it to their own in-house monitoring systems. You likely already have agents running on all your customer systems. There are so many options it's really your own preference based on your existing system and customer environments. biolatency Disk I/O latency histogram heat map 5.

Open Source 40

Open Source Latency Cache Energy 40

The Morning Paper

JANUARY 23, 2020

Today we’ll be digging into the analysis of an incident that took place at Etsy on December 4th, 2014. 1:18pm a key observation was made that an API call to populate the homepage sidebar saw a huge jump in latency. The shop had been closed so no data was available.

Internet 53

Internet Internet Cache Engineering 53

Brendan Gregg

AUGUST 8, 2017

Linux load averages are "system load averages" that show the running thread (task) demand on the system as an average number of running plus waiting threads. This measures demand, which can be greater than what the system is currently processing. then your system is idle. - cat /proc/loadavg. 42/3411 43603. 42/3411 43603.

Latency 111

Latency Metrics C++ Systems 111

Brendan Gregg

AUGUST 29, 2021

1072-aws (xxx) 12/18/2018 _x86_64_ (16 CPU) avg-cpu: %user %nice %system %iowait %steal %idle 5.03 avg-cpu: %user %nice %system %iowait %steal %idle 14.81 avg-cpu: %user %nice %system %iowait %steal %idle 14.86 avg-cpu: %user %nice %system %iowait %steal %idle 14.95 avg-cpu: %user %nice %system %iowait %steal %idle 14.54

Cache 40

Cache C++ AWS Systems 40

Alex Russell

MARCH 6, 2021

Devices and networks have evolved too: Alex Russell @slightlylate An update on mobile CPUs and the Performance Inequality Gap: Mid-tier Android devices (~$300) now get the single-core performance of a 2014 iPhone and the multi-core perf of a 2015 iPhone. Modern network performance and availability. Here begins our 2021 adventure.

Performance 124

Performance Network Cache Metrics 124

Brendan Gregg

SEPTEMBER 5, 2017

What follows are topics that may be of interest to anyone looking to migrate their systems and skillset: scan these to find topics that interest you. ## ZFS ZFS is available for Linux via the [zfsonlinux] and [OpenZFS] projects, and more recently was included in Canonical's Ubuntu Linux distribution: Ubuntu Xenial 16.04

Virtualization 76

Virtualization AWS Engineering Hardware 76

The Netflix TechBlog

FEBRUARY 20, 2019

by Jason Koch , with Martin Spier , Brendan Gregg , Ed Hunter Improving the tools available to our engineers to help them diagnose, triage, and work through software performance challenges in the cloud is a key goal for the cloud performance engineering team at Netflix. 10–20 MB/sec (it is, unsurprisingly, receiving lots of data).

Performance 211

Performance Latency Open Source Metrics 211

All Things Distributed

APRIL 4, 2017

The new AWS EU (Stockholm) Region will have three Availability Zones and will be ready for customers to use in 2018. As a result, we have opened 42 Availability Zones across 16 AWS Regions worldwide. This enables customers to serve content to their end users with low latency, giving them the best application experience.

AWS 116

AWS Airlines Latency Games 116

All Things Distributed

OCTOBER 25, 2018

The new AWS Africa (Cape Town) Region will have three Availability Zones and provide lower latency to end users across Sub-Saharan Africa. We already have 55 Availability Zones across 19 infrastructure regions that customers can use today. With the AWS based system, Exatype can do this at a fraction of the cost.

AWS 167

AWS Cloud Education Programming 167

Abhishek Tiwari

NOVEMBER 3, 2018

Recently I was asked about content management systems (CMS) of the future - more specifically how they are evolving in the era of microservices, APIs, and serverless computing. They often get blindsided by vendor’s pitch and end-up making decision based on some fancy demos (see my post from 2014 on Adobe AEM ).

Systems 63

Systems Cache Website Network 63

All Things Distributed

JULY 20, 2015

A cluster is just a pool of compute resources available to a customer’s applications. The agent is written in Go, has a minimal footprint, and is available on GitHub under an Apache license. This architecture affords Amazon ECS high availability, low latency, and high throughput because the data store is never pessimistically locked.

Latency 166

Latency Architecture AWS Open Source 166

All Things Distributed

DECEMBER 12, 2018

Today, I'm happy to announce that the AWS Europe (Stockholm) Region, our 20th Region globally, is now generally available for use by customers. With this launch, AWS now provides 60 Availability Zones, with another 12 zones and four Regions expected to come online by 2020 in Bahrain, Cape Town, Hong Kong, and Milan.

AWS 124

AWS Cloud Games Serverless 124