Brendan Gregg

SEPTEMBER 25, 2021

A Cassandra database cluster had switched to Ubuntu and noticed write latency increased by over 30%. Was there some other program consuming CPU, like a misbehaving Ubuntu service that wasn't in CentOS? I've shared many posts about superpower observability tools, but often humble hacking is just as effective. include <sys/time.h>

Speed 126

Speed Java AWS Virtualization 126

Brendan Gregg

SEPTEMBER 25, 2021

A Cassandra database cluster had switched to Ubuntu and noticed write latency increased by over 30%. Was there some other program consuming CPU, like a misbehaving Ubuntu service that wasn't in CentOS? I've shared many posts about superpower observability tools, but often humble hacking is just as effective. include <sys/time.h>

Speed 40

Speed Java AWS Virtualization 40

Alex Russell

JANUARY 30, 2024

If you or your company are able to generate a credible worldwide latency estimate in the higher percentiles for next year's update, please get in touch. So what did $650, give or take, buy in late 2017 or early 2018? Front-end developers are cursed to program the Devil's computer. but which blessedly sports 8GB of RAM.

Performance 90

Performance Network Mobile Speed 90

SQL Performance

APRIL 8, 2019

Back on December 5, 2017, Microsoft announced that they were using AMD EPYC 7551 processors in their storage-optimized Lv2-Series virtual machines. I wrote about using CPU-Z to benchmark the Intel Xeon E5-2673 v3 processor in an Azure VM in this article. Figure 1: CPU-Z Benchmark Results for LS16v2. Memory (GiB).

Azure 42

Azure Virtualization Storage Benchmarking 42

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. WebGL 2 launched for other platforms on Chrome and Firefox in 2017.

Media 145

Media Games Education Engineering 145

John McCalpin

JANUARY 22, 2018

Introduction: In December 2017, my colleague Damon McDougall (now at AMD) asked for help in porting the fused multiply-add example code from a Colfax report ( [link] ) to the Xeon Phi x200 (Knights Landing) processors here at TACC. simple addition instead of FMA) or with fewer registers and shorter pipeline latency (e.g,

Latency 40

Latency Hardware Code Testing 40