BFQ is a proportional-share storage-I/O scheduler that also supports cgroups. Available in Linux since 4.12, BFQ features the following performance (benchmark results here), on any type of storage medium (embedded flash storage, HDDs, SATA or NVMe SSDs, ...) and on systems ranging from minimal embedded systems to high-end servers: Low latency for interactive tasks Under load, BFQ loads application
If all these new DBMS technologies are so scalable, why are Oracle and DB2 still on top of TPC-C? A roadmap to end their dominance.
(This post is coauthored by Alexander Thomson and Daniel Abadi) In the last decade, database technology has arguably progressed furthest along the scalability dimension. There have been hundreds of research papers, dozens of open-source projects, and numerous startups attempting to improve the scalability of database technology. Many of these new technologies have been extremely influential---some
The USE Method provides a strategy for performing a complete check of system health, identifying common bottlenecks and errors. For each system resource, metrics for utilization, saturation and errors are identified and checked. Any issues discovered are then investigated using further strategies. This is an example USE-based metric list for Linux operating systems (eg, Ubuntu, CentOS, Fedora). Th
Likewise the current belief that, in the case of artificial machines the very large and the very small are equally feasible and lasting is a manifest error. Thus, for example, a small obelisk or column or other solid figure can certainly be laid down or set up without danger of breaking, while the large ones will go to pieces under the slightest provocation, and that purely on account of their own
TIP1 - Overview of C/C++ Debugging/Tracing/Profiling ToolsAI-enhanced description This document provides an overview and comparison of various tools for debugging, profiling, and tracing C/C++ programs on Linux. It discusses concepts and implementations of debugging tools like gdb and Valgrind, profiling tools like gprof and perf, and tracing tools like strace, SystemTap, and LTTng. For each tool,
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Fast Julia was designed for high performance. Julia programs automatically compile to efficient native code via LLVM, and support multiple platforms. Dynamic Julia is dynamically typed, feels like a scripting language, and has good support for interactive use, but can also optionally be separately compiled. Reproducible Reproducible environments make it possible to recreate the same Julia environm
Valgrind's Tool Suite The Valgrind distribution includes the following debugging and profiling tools: Memcheck Cachegrind Callgrind Massif Helgrind DRD DHAT Experimental Tools Other Tools Memcheck Memcheck detects memory-management problems, and is aimed primarily at C and C++ programs. When a program is run under Memcheck's supervision, all reads and writes of memory are checked, and calls to mal
概要 Linuxのパフォーマンス解析ツールであるperfの使いかたの紹介 背景 個人的にperfよくできてると思うので紹介したいというのと、 パフォーマンスカウンタの読み方ってあんまり知られてないみたいなので、 それの解説を書きたい。 構成 perf について説明したあと、パフォーマンスカウンタの読みかた、見かた、を説明する。 perfとは何か Linuxに付いてくるプロファイラ。 man perf によると、 NAME ---- perf - Performance analysis tools for Linux と、書いてある。名前がひどいのでなんとかしてほしい。 perf の特徴 個人的には、手軽に使えるのが素晴らしいと思う。 2.6.31以降カーネルに標準で付いてる。(Ubuntuだとlinux-tools-common(TODO:あとで確認)で入るはず) 特殊な設定が必要無く、
Queue networks are systems in which single queues are connected by a routing network. In this image, servers are represented by circles, queues by a series of rectangles and the routing network by arrows. In the study of queue networks one typically tries to obtain the equilibrium distribution of the network, although in many applications the study of the transient state is fundamental. Queueing t
Contributors (in historical order) Roman Dementiev, Thomas Willhalm, Otto Bruggeman, Patrick Fay, Patrick Ungerer, Austen Ott, Patrick Lu, James Harris, Phil Kerly, Patrick Konsor,Andrey Semin, Michael Kanaly, Ryan Brazones, Rahul Shah, Jacob Dobkins Introduction to Intel® PCM (Performance Counter Monitor) The complexity of computing systems has tremendously increased over the last decades. Hierar
Energy efficiency is the new fundamental limiter of processor performance, way beyond numbers of processors. Microprocessors—single-chip computers—are the building blocks of the information world. Their performance has grown 1,000-fold over the past 20 years, driven by transistor speed and energy scaling, as well as by microarchitecture advances that exploited the transistor density gains from Moo
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