Randon ASCII

FEBRUARY 25, 2018

See the end of the post for an October 2018 bug fix update, or read the whole story: Flaky failures are the worst. This was starting to look like a Windows file cache bug. Maybe something to do with multi-socket coherency of the disk and cache or ??? Update, October 2018. failure rate.

Programming 79

Programming Hardware Cache Code 79

Brendan Gregg

AUGUST 18, 2019

C @ns: [256, 512) 10900 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@ | [512, 1k) 18291 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@| [1k, 2k) 4998 |@@@@@@@@@@@@@@ | [2k, 4k) 57 | | [4k, 8k) 117 | | [8k, 16k) 48 | | [16k, 32k) 109 | | [32k, 64k) 3 | |. . ### Source Here's the code to biolatency.bt: tools# cat -n biolatency.bt. Attaching 3 probes.

Latency 57

Latency C++ Cache Programming 57

Sutter's Mill

JANUARY 25, 2021

Not only is the integer comparison operation cheap, but min and max are already being accessed by this function and so they’re already “hot” in registers or cache. P0542: Support for contract based programming in C++” (WG21 paper, June 2018). b) arbitrarily expensive “A condition that’s expensive? Dos Reis, J. Meredith, N.

C++ 63

C++ Programming Cache Testing 63

Brendan Gregg

AUGUST 29, 2021

1072-aws (xxx) 12/18/2018 _x86_64_ (16 CPU) avg-cpu: %user %nice %system %iowait %steal %idle 5.03 100.00 ^C I'm looking at the r_await column in particular: the average wait time for reads in milliseconds. . ## 2. 1072-aws (xxx) 12/18/2018 _x86_64_ (16 CPU) avg-cpu: %user %nice %system %iowait %steal %idle 5.03 17 48011 [.]

Cache 40

Cache C++ AWS Systems 40

Smashing Magazine

JUNE 30, 2021

First and foremost, this allows you to implement arbitrarily complex caching behavior, but it has also been extended to let you tap into long-running background fetches, push notifications, and other functionality that requires code to run without an associated page. The DOM actor now updates the DOM according to the new state object.

Games 145

Games Architecture Code C++ 145

Percona

DECEMBER 5, 2022

ProxySQL is a very useful tool for gaining high availability, load balancing, query routing, query caching, query rewriting, multiplexing, and data masking. Your MySQL connection id is 1 Server version: 5.5.30 (ProxySQL Admin Module) Copyright (c) 2000, 2018, Oracle, MariaDB Corporation Ab and others. Commands end with ; or g.

Servers 60

Servers Cache C++ Metrics 60

The Morning Paper

DECEMBER 1, 2019

Memory might be durable, but… …it is expected that caches and registers will remain volatile. Plus ça change, plus c’est la même chose. So, we’re going to need to take care that everything we say is committed is truly durable, and that we can recover to a consistent state following a crash.

Efficiency 60

Efficiency Cache C++ Performance 60

Brendan Gregg

FEBRUARY 9, 2018

This overhead can be reduced by A) pcid, fully available in Linux 4.14, and B) Huge pages. - **Cache access pattern**: the overheads are exacerbated by certain access patterns that switch from caching well to caching a little less well. virtual (bgregg-c5.9xl-i-xxx) 02/09/2018 _x86_64_ (36 CPU) 05:24:51 PM proc/s cswch/s.

Performance 72

Performance Benchmarking Cache Tuning 72

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. Upon receipt of a valid Alt-Svc header indicating HTTP/3 support, the browser will cache this and try to set up a QUIC connection from then on.

Network 120

Network Servers Cache Traffic 120

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

ACM Sigarch

MARCH 18, 2019

For example, how many buffers must a cache have to record outstanding misses if it receives 2 memory references per cycle at 2.5 In our second blog post , we will present the M/M/1 queue that confronts us with a stark, required trade-off among (a) allowing unscheduled task arrivals, (b) minimizing latency, and (c) maximizing throughput.

Systems 60

Systems Latency Performance Analytics 60

Percona

MAY 1, 2023

This blog was originally published in August 2018 and was updated in May 2023. Connection pooling: Minimizing connection overhead and improving response times for frequently accessed data by implementing mechanisms for connection pooling and caching strategies. It is just a guideline, not the exact allocated memory or cache size.

Tuning 52

Tuning Database Efficiency Performance 52

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

This overhead can be reduced by A) pcid, fully available in Linux 4.14, and B) Huge pages. - **Cache access pattern**: the overheads are exacerbated by certain access patterns that switch from caching well to caching a little less well. virtual (bgregg-c5.9xl-i-xxx) 02/09/2018 _x86_64_ (36 CPU) 05:24:51 PM proc/s cswch/s.

Performance 40

Performance Benchmarking Cache Tuning 40

SQL Server According to Bob

DECEMBER 18, 2018

Device level flushing may have an impact on your I/O caching, read ahead or other behaviors of the storage system. FILE_FLAG_NO_BUFFERING is the Win32, CreateFile API flags and attributes setting to bypass file system cache. FILE_FLAG_NO_BUFFERING is the Win32, CreateFile API flags and attributes setting to bypass file system cache.

Servers 90

Servers Media Cache Storage 90

Smashing Magazine

OCTOBER 26, 2018

2018-10-26T13:45:46+02:00. When it comes down to how WordPress is programmed, one thing is certain: it doesn’t follow the M odel- V iew- C ontroller (MVC) design pattern that many developers are familiar with. Headless WordPress: The Ups And Downs Of Creating A Decoupled WordPress. Denis Žoljom. 2019-04-29T18:34:58+00:00.

Cache 88

Cache Website Speed Testing 88

Smashing Magazine

JANUARY 11, 2021

Build Optimizations JavaScript modules, module/nomodule pattern, tree-shaking, code-splitting, scope-hoisting, Webpack, differential serving, web worker, WebAssembly, JavaScript bundles, React, SPA, partial hydration, import on interaction, 3rd-parties, cache. This improves page load time and caching during navigations.

Performance 145

Performance Cache Metrics Media 145

Smashing Magazine

JANUARY 6, 2020

Globally in 2018–2019, according to the IDC, 87% of all shipped mobile phones are Android devices. PRPL stands for Pushing critical resource, Rendering initial route, Pre-caching remaining routes and Lazy-loading remaining routes on demand. In 2018, the Alliance of Open Media has released a new promising video format called AV1.

Performance 112

Performance Cache Servers Network 112

Smashing Magazine

JANUARY 7, 2019

The idea is quite straightforward: Push the minimal code needed to get interactive for the initial route to render quickly, then use service worker for caching and pre-caching resources and then lazy-load routes that you need, asynchronously. In 2018, the Alliance of Open Media has released a new promising video format called AV1.

Performance 111

Performance Cache Network Metrics 111