Brendan Gregg

SEPTEMBER 5, 2021

They claimed that the ZFS file system was consuming 30% of CPU capacity. These included a breakdown of CPU time into percentages for "usr" (user: applications) and "sys" (system: the kernel). The other colors are yellow for C++, and red for other user-level code.) cd to the file system and ls(1) to see what's there.

Cache 40

Cache Cloud Java Tuning 40

Brendan Gregg

FEBRUARY 9, 2018

In this post I'll look at the Linux kernel page table isolation (KPTI) patches that workaround Meltdown: what overheads to expect, and ways to tune them. Also microbenchmarks, which often stress-test the system, will suffer the largest losses. This shows the system-wide syscall rate. Much of my testing was on Linux 4.14.11

Performance 75

Performance Benchmarking Cache Tuning 75

The Netflix TechBlog

OCTOBER 18, 2019

These signals include member activity data (login, search, playback), intent-to-treat (what title/assets the system wants to impress to the member) and the treatment (impressions of images, trailers) that actually made it to the member’s device. dxblearn also allows them to fire off training jobs for hyperparameter tuning.

Infrastructure 126

Infrastructure Metrics Architecture Efficiency 126

Smashing Magazine

SEPTEMBER 6, 2021

This approach was touted to be better for fine-grained caching because each subresource could be cached individually and the full bundle didn’t need to be redownloaded if one of them changed. As discussed in part 2 , in HTTP/2, this multiplexing is steered using its prioritization system. What Does It All Mean? Implementation.

Network 105

Network Servers Cache Traffic 105

High Scalability

NOVEMBER 25, 2019

He and his colleagues spend their productive hours scaling large distributed file systems. Our only option was to roll up our sleeves and build basic cloud file system components such as object store ourselves. Edge caching. Nginx for disk based caching. Java used to power core file system code. Introduction.

Architecture 52

Architecture Cache Azure Storage 52

The Netflix TechBlog

OCTOBER 18, 2019

These signals include member activity data (login, search, playback), intent-to-treat (what title/assets the system wants to impress to the member) and the treatment (impressions of images, trailers) that actually made it to the member’s device. dxblearn also allows them to fire off training jobs for hyperparameter tuning.

Infrastructure 100

Infrastructure Metrics Architecture Efficiency 100

HammerDB

NOVEMBER 5, 2018

If you are new to running Oracle, SQL Server, MySQL and PostgreSQL TPC-C workloads with HammerDB and have needed to investigate I/O performance the chances are that you have experienced waits on writing to the Redo, Transaction Log or WAL depending on the database you are testing. SQL> alter system flush buffer_cache; System altered.

Benchmarking 40

Benchmarking Database C++ Virtualization 40

Brendan Gregg

FEBRUARY 8, 2018

In this post I'll look at the Linux kernel page table isolation (KPTI) patches that workaround Meltdown: what overheads to expect, and ways to tune them. Also microbenchmarks, which often stress-test the system, will suffer the largest losses. This shows the system-wide syscall rate. Much of my testing was on Linux 4.14.11

Performance 40

Performance Benchmarking Cache Tuning 40

Smashing Magazine

AUGUST 22, 2021

However, TCP is typically implemented in the operating system’s (OS’) kernel, a secure and more restricted environment, which for most OSes isn’t even open source. As such, tuning congestion logic is usually only done by a select few developers, and evolution is slow. This multiplexing can happen in many different ways.

Performance 106

Performance Network Latency Servers 106

Smashing Magazine

JUNE 26, 2020

Since operating system dark modes have become more prevalent, I also subtly alter the lightness and saturation of colors in my palettes, so they appear more vibrant against dark backgrounds. CSS transforms are ideal tools for fine-tuning the size and position of elements within grids’ constraints. Left: My color palette.

Design 95

Design Media C++ Energy 95

SQL Server According to Bob

JANUARY 11, 2020

​​ Without limiting the rights under copyright, no part of this document may be reproduced, stored in or introduced into a retrieval system, or transmitted in any form or by any means (electronic, mechanical, photocopying, recording, or otherwise), or for any purpose, without the express written permission of Microsoft Corporation.

Servers 40

Servers Cache Database Media 40