Brendan Gregg

SEPTEMBER 25, 2021

A Cassandra database cluster had switched to Ubuntu and noticed write latency increased by over 30%. top(1) showed that only the Cassandra database was consuming CPU. Amazon even provides an official [recommendation] (2021): "For EC2 instances launched on the AWS Xen Hypervisor, it's a best practice to use the tsc clock source.

Speed 126

Speed Java AWS Virtualization 126

Alex Russell

MARCH 6, 2021

Here begins our 2021 adventure. If there's a bright spot in our construction of a 2021 baseline for performance, this is it. Using a global ASP as a benchmark can further mislead thanks to the distorting effect of ultra-high-end prices rising while shipment volumes stagnate. A 2021 Global Baseline. Hard Reset.

Performance 124

Performance Network Cache Metrics 124

Brendan Gregg

SEPTEMBER 25, 2021

A Cassandra database cluster had switched to Ubuntu and noticed write latency increased by over 30%. top(1) showed that only the Cassandra database was consuming CPU. Amazon even provides an official [recommendation] (2021): "For EC2 instances launched on the AWS Xen Hypervisor, it's a best practice to use the tsc clock source.

Speed 40

Speed Java AWS Virtualization 40

Brendan Gregg

SEPTEMBER 25, 2021

A Cassandra database cluster had switched to Ubuntu and noticed write latency increased by over 30%. top(1) showed that only the Cassandra database was consuming CPU. Amazon even provides an official recommendation (2021): "For EC2 instances launched on the AWS Xen Hypervisor, it's a best practice to use the tsc clock source.

Speed 52

Speed Java AWS Virtualization 52

Alex Russell

APRIL 29, 2021

As an engineer on a browser team, I'm privy to the blow-by-blow of various performance projects, benchmark fire drills, and the ways performance marketing (deeply) impacts engineering priorities. With each team, benchmarks lost are understood as bugs. WebGPU is likely to ship in Chrome in late 2021. This is as it should be.

Media 145

Media Games Education Engineering 145

Alex Russell

MAY 9, 2022

This is a complex topic, but to borrow from a recent post , web performance expands access to information and services by reducing latency and variance across interactions in a session, with a particular focus on the tail of the distribution (P75+). Consistent performance matters just as much as low average latency.

Performance 86

Performance Latency Metrics Engineering 86