Adrian Cockcroft

JANUARY 29, 2023

The mean and percentile measurements hide this structure, but the rest of this post will show how the structure can be measured and analyzed so that you can figure out a useful model of your system, understand what is driving the long tail of latencies and come up with better SLAs and measures of capacity.

Lambda 98

Lambda Latency Cache C++ 98

Alex Russell

DECEMBER 18, 2022

Add to this the fact that desktop devices have a lifespan between five and eight years, on average, and that the P75 device was sold in 2016. That is, what was the average device in 2016? These devices feature: Eight slow, big.LITTLE ARM cores (A75+A55, or A73+A53) built on last-generation processes with very little cache.

Performance 113

Performance Network Mobile Latency 113

Brendan Gregg

OCTOBER 8, 2018

Screenshot: tracing read latency for PID 181: # bpftrace -e 'kprobe:vfs_read /pid == 30153/ { @start[tid] = nsecs; } kretprobe:vfs_read /@start[tid]/ { @ns = hist(nsecs - @start[tid]); delete(@start[tid]); }'. ^C Some one-liners: # New processes with arguments bpftrace -e 'tracepoint:syscalls:sys_enter_execve { join(args->argv); }'.

C++ 110

C++ Virtualization Programming Latency 110

Percona

JANUARY 24, 2023

Some of the built-in features ( wal_compression ) have been there since 2016, and almost all backup tools do the WAL compression before taking it to the backup repository. Individual processes generate WAL records, and latency is very crucial for transactions.

Database 118

Database Benchmarking Open Source Latency 118

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. Who owns this code?

Performance 86

Performance Latency Metrics Engineering 86

John McCalpin

APRIL 2, 2020

This was a keynote presentation at the “2nd International Workshop on Performance Modeling: Methods and Applications” (PMMA16), June 23, 2016, Frankfurt, Germany (in conjunction with ISC16 ). In the 2007 SPECfp_rate tests, a similar phenomenon was seen, and required the addition of a third component to the model: memory latency.

Benchmarking 59

Benchmarking Performance Latency Architecture 59

CSS - Tricks

APRIL 1, 2021

The code for the site is available on GitHub for reference. Redirects are often pretty light in terms of the latency that they add to a website, but they are an easy first thing to check, and they can generally be removed with little effort. This process can be “blocked” if it has to wait for resources to load before it runs.

Cache 92

Cache Social Media Media Network 92