Brendan Gregg

AUGUST 29, 2021

A service team was debugging a performance issue and noticed it coincided with a high rate of paging. I was asked to help, and used a variety of performance tools to solve this including those that use eBPF and Ftrace. Reads usually have apps waiting on them; writes may not (write-back caching). Hit Ctrl-C to end. ^C

Cache 105

Cache C++ AWS Latency 105

Brendan Gregg

JULY 2, 2021

cachestat File system cache statistics line charts. I chose these to find the most performance wins with the fewest tools. Then, having discovered everything is C or Python, some rewrite it all in a different language. execsnoop New processes (via exec(2)) table. opensnoop Files opened table. BPF up and running! at the time.

Latency 145

Latency Cache Energy Systems 145

Brendan Gregg

AUGUST 29, 2021

A service team was debugging a performance issue and noticed it coincided with a high rate of paging. I was asked to help, and used a variety of Linux performance tools to solve this including those that use eBPF and Ftrace. 100.00 ^C I'm looking at the r_await column in particular: the average wait time for reads in milliseconds.

Cache 40

Cache C++ AWS Systems 40

Nick Desaulniers

JUNE 2, 2018

ccache , the compiler cache, is a fantastic way to speed up build times for C and C++ code that I previously recommended. Usually when this happens with ccache, there’s something non-deterministic about the builds that prevents cache hits. Cold Cache. kB max cache size 5.0 kB max cache size 5.0

Speed 46

Speed Cache C++ Systems 46

ACM Sigarch

MARCH 18, 2019

Existing systems can be studied with measurement, while prospective systems are most often studied by extrapolating from measurements of prior systems or via simulation software that mimics target system function and provides performance metrics. Can one both minimize latency and maximize throughput for unscheduled work? Answered in Part 2.).

Systems 60

Systems Latency Performance Analytics 60

ACM Sigarch

MARCH 25, 2019

The M/M/1 queue will show us a required trade-off among (a) allowing unscheduled task arrivals, (b) minimizing latency, and (c) maximizing throughput. For the previous cache miss buffer example, the 32-buffer answer is minimal for 100-ns average miss latency. While Little’s Law provides a black-box result, it does not expose tradeoffs.

Systems 53

Systems Latency Performance C++ 53

Percona

JUNE 4, 2023

Critical features of MariaDB include robust security features like encryption at rest and in transit, user authentication, and role-based access control (RBAC), as well as high-performance query execution, advanced indexing techniques, and replication, clustering, and sharding, ensuring scalability and high availability. What is MySQL?

Open Source 52

Open Source Servers Storage Scalability 52