実践的なパターン: テストの容易性を高める設計
Contents Introducing TPL Structured Parallelism Overexposing Parallelism A Ray Tracer Example Dynamic Work Distribution Aggregation Fork-Join Parallelism Tasks and Futures Replicable Tasks The Task Manager Multi-processor machines are now becoming standard while the speed increases of single processors have slowed down. The key to performance improvements is therefore to run a program on multiple
Azul Systems - Cliff Click Jr.âs Blog
And now some Hardware Transactional Memory comments... February 25, 2009 (sorry for the long gap between postings; work's gotten interesting and I got busy)I recently attended the Bay Area Workshop on Transactional Memory at Stanford generously hosted by HP. Slides are here; my slides are helpfully titled "2009_TMW.pdf". In this workshop I gave a brief overview of Azul Systems' Hardware Transac
Rainmaker | タグクラウド製造ソフト
In recent years, mobile apps have gained immense popularity due to their contribution to business growth. Do you find app development challenges? If yes, you are in the right place! We believe that building an app is not critical when you know nothing about coding. You might be wondering about app development without coding. Is it possible? The answer is yes! This article will discuss the free app
Elsevier · Herlihy, Shavit: The Art of Multiprocessor Programming · Welcome
The Art of Multiprocessor Programming promises to be the first comprehensive presentation of the principles and tools available for programming multiprocessor machines. As the computer industry changes from single-processor to multiprocessor architectures, this revolution requires a fundamental change in how programs are written. To leverage the performance and power of multiprocessor programming,
Scalable Synchronization Research Group
Sun Labs Scalable Synchronization Research Group We don't play transactional memory pioneers on TV, we just are them in real life. Staff Dave Dice, full-time member Maurice Herlihy, visiting professor Yossi Lev, intern ('04 - '08) Victor Luchangco, full-time member Virendra Marathe, full-time member Mark Moir, Principal Investigator Dan Nussbaum, full-time member Marek Olszewski, extern (J
OSRC: Multi- and Manycore Systems
Multi- and Manycore Systems Research Fast forward to VELOX Advanced Synchronization Facility (ASF) Publications PTLsim release Introduction Future CPU generations will no longer be able to increase their single-thread performance exponentially. Instead, CPUs will scale the number of processing cores. In consequence, software will no longer get faster execution speeds automatically with each hard
volatile vs. volatile
Case 1: Ordered Atomic Variables For Lock-Free Programming Lock-free programming is all about doing communication and synchronization between threads using lower-level tools than mutex locks. In the past and even today, however, these tools are all over the map. In rough historical order, they include explicit fences/barriers (e.g., Linux's mb()), order-inducing special API calls (e.g., Windows' I
Non-blocking algorithm - Wikipedia
In computer science, an algorithm is called non-blocking if failure or suspension of any thread cannot cause failure or suspension of another thread;[1] for some operations, these algorithms provide a useful alternative to traditional blocking implementations. A non-blocking algorithm is lock-free if there is guaranteed system-wide progress, and wait-free if there is also guaranteed per-thread pro
Towards a Scalable Non-Blocking Coding Style（状態遷移機械の設計に関して）
Webinar: Managing the Security and Commercial Impact of Java Updates March 12, 2020 Live WebinarJoin Azul and SoftwareONE for this webinar about the security and commercial applications of Java...Read More dev.next March 24-27, 2020 Broomfield, CO, USAAzul is one of the sponsors at this event which brings together practitioners, experts, and...Read More
Upcoming Azul events - trade shows, conferences, speaking engagements
Webinar: Managing the Security and Commercial Impact of Java Updates March 12, 2020 Live WebinarJoin Azul and SoftwareONE for this webinar about the security and commercial applications of Java...Read More dev.next March 24-27, 2020 Broomfield, CO, USAAzul is one of the sponsors at this event which brings together practitioners, experts, and...Read More
マルチスレッド環境でlongを共有するときの注意 2008-11-17 - きしだのはてな
このプログラムは止まるだろうか？ このスレッドは、lockの上位32ビットと下位32ビットが異なると止まる。mainでは、lockに同じ乱数を上位32ビットと下位32ビットに設定する。 だから、プログラムが書いた通りに動けば止まらないはず。 import java.util.Random; public class VolatileSample { static long lock = 0; public static void main(String[] args){ new Thread(){ @Override public void run() { for(;;){ long t = lock; long high = t >> 32; long low = t & 0xffffffffL; if(high != low){//上位32ビットと下位32ビットが等しいか判定 Syst
Computer Laboratory – Systems Research Group – NetOS: Practical lock-free data structures
Introduction Through careful design and implementation it's possible to build data structures that are safe for concurrent use without needing to manage locks or block threads. These non-blocking data structures can increase performance by allowing extra concurrency and can improve robustness by avoiding some of the problems caused by priority inversion in local settings, or machine and link failu
革命の日々！ シーケンスロック その５ volatileがダメな理由
どもども。またまた間隔があいてしまいましたがシーケンスロックな話しの続きです。 前回の記事で坩堝さんから面白い指摘をうけたので今回は予定を変更してvolatileの話をしたいと思います。 retをvolatileにするだけではうまくいかないんですよね？ どういう風になるんだろ． なるほど、たしかに世のＣ言語の参考書を見るとvolatileはある種の最適化を妨げる効果を持つと されています。 これだけ見ると、volatileとつけるだけすべての最適化が無効になってうまく動きそうですね。 しかし、その理屈は微妙におかしいのである 多くの人が「ある種の」という言葉を拡大解釈しているがvolatileは本来スレッド同期に使えるようなシロモノではないのである。 つづきは、続きを読むからご覧ください。 あと、お願い。 今回の話は前提知識がいろいろとあるので、末尾のご参考にあげたURLを読んでから 読ん
Fast reader/writer locks [LWN.net]
The Linux kernel contains a number of primitives for controlling mutual exclusion. Semaphores and spinlocks (in several varieties) have been around for a while, and the read-copy-update mechanism was added in the 2.5 series. Yet another mechanism, called "fast reader/writer locks," has found its way into Andrew Morton's -mm patch set, and appears likely to be forwarded on to Linus soon for inclusi
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