Brendan Gregg

MARCH 16, 2024

I've seen it where the random data ends up pointing to itself, so the profiler gets stuck in a loop and you get a tower of junk frames until perf hits its max frame limit. From my flame graphs page: CPU flame graph (partly broken) (Click for original SVG.) These partial stacks get grouped together on the left.

Java 145

Java Cache Google Hardware 145

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. What about short-lived processes, like a service restarting in a loop? How long does it take to read the time? apparmor?).

Speed 126

Speed Java AWS Virtualization 126

SQL Server According to Bob

DECEMBER 18, 2018

Durability is a cornerstone of any database system and starting with SQL Server 2017 on Linux Cumulative Update 6 (CU6), SQL Server on Linux enables “Forced Flush” behavior as described in this article , improving durability on non-Fua optimized systems. “Be Starting with the Linux 4.18 4 Socket, TPCC. 9,108 – Old kernel.

Servers 90

Servers Media Cache Storage 90

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. What about short-lived processes, like a service restarting in a loop? How long does it take to read the time? apparmor?).

Speed 52

Speed Java AWS Virtualization 52

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. What about short-lived processes, like a service restarting in a loop? How long does it take to read the time? apparmor?).

Speed 40

Speed Java AWS Virtualization 40

Smashing Magazine

JULY 2, 2021

In this article, we’ll explain how a proper email testing workflow can help you improve email sending efficiency. With this article, you will enhance your testing workflows by covering all the important aspects, and saving time and stress with suitable email testing methods and tools. Let’s talk email testing! More after jump!

Testing 109

Testing Servers Social Media Automotive 109

Brendan Gregg

AUGUST 8, 2017

Load averages are an industry-critical metric – my company spends millions auto-scaling cloud instances based on them and other metrics – but on Linux there's some mystery around them. Linux load averages track not just runnable tasks, but also tasks in the uninterruptible sleep state. I've never seen an explanation.

Latency 111

Latency Metrics C++ Systems 111