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

Brendan Gregg

AUGUST 29, 2021

biolatency From [bcc], this eBPF tool shows a latency histogram of disk I/O. Smaller File Test For further confirmation, I collected the same outputs for a 32 Gbyte file upload. cachestat]: /blog/2014-12-31/linux-page-cache-hit-ratio.html [60-second performance checklist]: Articles/Netflix_Linux_Perf_Analysis_60s.pdf [bcc]: [link]

Cache 105

Cache C++ AWS Latency 105

Brendan Gregg

MAY 16, 2017

When I joined Netflix in April 2014, we had over 40 million subscribers in 41 countries. A latency outlier issue that happened every 15 minutes. In the last three years I developed the ftrace-based [perf-tools] and used them to solve many problems, which I wrote about in [lwn.net] and spoke about at [LISA 2014].

Java 75

Java Entertainment Engineering Scalability 75

All Things Distributed

DECEMBER 12, 2018

They can run applications in Sweden, serve end users across the Nordics with lower latency, and leverage advanced technologies such as containers, serverless computing, and more. After the move to the AWS Cloud, the company now has a way to develop and test solutions quickly and at a low cost. Telenor Connexion.

AWS 124

AWS Cloud Games Serverless 124

Speed Curve

MARCH 31, 2014

To keep inline with browser trends and average connection speeds SpeedCurve will begin updating the test setting every quarter. The 9.8Mbps download speed is based on the latest State of the Internet report from Akamai.

Speed 40

Speed Latency Internet Internet 40

Tim Kadlec

SEPTEMBER 25, 2014

For this test, I decided to profile just jQuery 2.1.1, The results above are based on the median times taken from 20 tests per browser/device combination. The results above are based on the median times taken from 20 tests per browser/device combination. Macbook Air (2014). Macbook Air (2014). Macbook Air (2014).

Latency 41

Latency Google Hardware Servers 41

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. This is part 2 of our look at Allspaw’s 2015 master thesis (here’s part 1 ). " – wikipedia.

Internet 53

Internet Internet Cache Engineering 53

SQL Server According to Bob

SEPTEMBER 26, 2016

As we moved towards SQL Server 2014, the pace of hardware accelerated. Our customers who deployed Availability Groups were now using servers for primary and secondary replicas with 12+ core sockets and flash storage SSD arrays providing microsecond to low millisecond latencies.

Availability 40

Availability Servers Hardware Benchmarking 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. mid-priced Androids were slightly faster than 2014's iPhone 6.

Performance 124

Performance Network Cache Metrics 124

Alex Russell

APRIL 29, 2021

Thanks to the Web Platform Tests project and wpt.fyi , we have the makings of an answer for the first: Tests that fail only in a given browser. wpt.fyi 's new Compat 2021 dashboard narrows this full range of tests to a subset chosen to represent the most painful compatibility bugs : Stable-channel Compat 2021 results over time.

Media 145

Media Games Education Engineering 145

KeyCDN

JUNE 20, 2019

Online users are becoming less and less patient meaning you as an eCommerce store owner need to implement methods for reducing latency and speeding up your website. This reduces latency and speeds up your website. As of 2014, the number of mobile users surpassed that of desktop users and shows no signs of slowing down.

Ecommerce 41

Ecommerce Speed Website Mobile 41

Abhishek Tiwari

NOVEMBER 3, 2018

Using CDN for the whole website, you can offload most of the website traffic to your CDN which will handle not only large traffic spikes but also reduce the latency of content delivery. 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

Brendan Gregg

AUGUST 29, 2021

biolatency From [bcc], this eBPF tool shows a latency histogram of disk I/O. Smaller File Test For further confirmation, I collected the same outputs for a 32 Gbyte file upload. cachestat]: /blog/2014-12-31/linux-page-cache-hit-ratio.html [60-second performance checklist]: /Articles/Netflix_Linux_Perf_Analysis_60s.pdf [bcc]: [link]

Cache 40

Cache C++ AWS Systems 40

Brendan Gregg

SEPTEMBER 5, 2017

We're now testing container hosts in production on btrfs, instead of ZFS. Here's some output from my zfsdist tool, in bcc/BPF, which measures ZFS latency as a histogram on Linux: # zfsdist. Tracing ZFS operation latency. In a test environment, I've seen several more Linux panics in the past three years.

Virtualization 76

Virtualization AWS Engineering Hardware 76