Brendan Gregg

AUGUST 26, 2021

A quick internet search revealed nothing. Redirecting them to the file system so I can then do core dump analysis using gdb(1) , as root: # cat /proc/sys/kernel/core_pattern |/usr/share/apport/apport %p %s %c %d %P # mkdir /var/cores # echo "/var/cores/core.%e.%p.%h.%t" Hit Ctrl-C to end. ^C signals.bt The signals.bt

Storage 40

Storage C++ Processing Database 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. Colleagues/Internet I love using [Linux performance tools]. As (C) looked like a kernel rebuild, I started with (D) and (E). ## 5. us on Centos and 0.68

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%. top(1) showed that only the Cassandra database was consuming CPU. Colleagues/Internet I love using [Linux performance tools]. As (C) looked like a kernel rebuild, I started with (D) and (E). ## 6. us on Centos and 0.68

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. Colleagues/Internet I love using Linux performance tools. As (C) looked like a kernel rebuild, I started with (D) and (E). These can be invisible to top(8).

Speed 52

Speed Java AWS Virtualization 52

Smashing Magazine

JANUARY 6, 2020

In real-life world, most products aren’t even close: an median bundle size today is around 417KB , which is up 42% compared to early 2015. In 2015, Google introduced Brotli , a new open-source lossless data format, which is now supported in all modern browsers. Assets Optimizations. Use Brotli for plain text compression.

Performance 145

Performance Cache Network Metrics 145

Smashing Magazine

JANUARY 7, 2019

In real-life world, most products aren’t even close: an average bundle size today is around 400KB , which is up 35% compared to late 2015. In 2015, Google introduced Brotli , a new open-source lossless data format, which is now supported in all modern browsers. We could also go beyond the bundle size budget though.

Performance 103

Performance Cache Metrics Network 103