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The Interplay of Compile-Time and Run-Time Options for Performance Prediction Luc Lesoil, Mathieu Acher, Xhevahire Tërnava, Arnaud Blouin, Jean-Marc Jézéquel
The Interplay of Compile-time and Run-time Options for Performance Prediction Luc Lesoil, Mathieu Acher, Xhevahire Tërnava, Arnaud Blouin, Jean-Marc Jézéquel To cite this version: Luc Lesoil, Mathieu Acher, Xhevahire Tërnava, Arnaud Blouin, Jean-Marc Jézéquel. The Interplay of Compile-time and Run-time Options for Performance Prediction. SPLC 2021 - 25th ACM Inter- national Systems and Software Product Line Conference - Volume A, Sep 2021, Leicester, United Kingdom. pp.1-12, 10.1145/3461001.3471149. hal-03286127 HAL Id: hal-03286127 https://hal.archives-ouvertes.fr/hal-03286127 Submitted on 15 Jul 2021 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. The Interplay of Compile-time and Run-time Options for Performance Prediction Luc Lesoil, Mathieu Acher, Xhevahire Tërnava, Arnaud Blouin, Jean-Marc Jézéquel Univ Rennes, INSA Rennes, CNRS, Inria, IRISA Rennes, France [email protected] ABSTRACT Both compile-time and run-time options can be configured to reach Many software projects are configurable through compile-time op- specific functional and performance goals. tions (e.g., using ./configure) and also through run-time options (e.g., Existing studies consider either compile-time or run-time op- command-line parameters, fed to the software at execution time). -
A Hardware Abstraction Layer in Java
A Hardware Abstraction Layer in Java MARTIN SCHOEBERL Vienna University of Technology, Austria STEPHAN KORSHOLM Aalborg University, Denmark TOMAS KALIBERA Purdue University, USA and ANDERS P. RAVN Aalborg University, Denmark Embedded systems use specialized hardware devices to interact with their environment, and since they have to be dependable, it is attractive to use a modern, type-safe programming language like Java to develop programs for them. Standard Java, as a platform independent language, delegates access to devices, direct memory access, and interrupt handling to some underlying operating system or kernel, but in the embedded systems domain resources are scarce and a Java virtual machine (JVM) without an underlying middleware is an attractive architecture. The contribution of this paper is a proposal for Java packages with hardware objects and interrupt handlers that interface to such a JVM. We provide implementations of the proposal directly in hardware, as extensions of standard interpreters, and finally with an operating system middleware. The latter solution is mainly seen as a migration path allowing Java programs to coexist with legacy system components. An important aspect of the proposal is that it is compatible with the Real-Time Specification for Java (RTSJ). Categories and Subject Descriptors: D.4.7 [Operating Systems]: Organization and Design—Real-time sys- tems and embedded systems; D.3.3 [Programming Languages]: Language Classifications—Object-oriented languages; D.3.3 [Programming Languages]: Language Constructs and Features—Input/output General Terms: Languages, Design, Implementation Additional Key Words and Phrases: Device driver, embedded system, Java, Java virtual machine 1. INTRODUCTION When developing software for an embedded system, for instance an instrument, it is nec- essary to control specialized hardware devices, for instance a heating element or an inter- ferometer mirror. -
Mashup Architecture for Connecting Graphical Linux Applications Using a Software Bus Mohamed-Ikbel Boulabiar, Gilles Coppin, Franck Poirier
Mashup Architecture for Connecting Graphical Linux Applications Using a Software Bus Mohamed-Ikbel Boulabiar, Gilles Coppin, Franck Poirier To cite this version: Mohamed-Ikbel Boulabiar, Gilles Coppin, Franck Poirier. Mashup Architecture for Connecting Graph- ical Linux Applications Using a Software Bus. Interacción’14, Sep 2014, Puerto de la Cruz. Tenerife, Spain. 10.1145/2662253.2662298. hal-01141934 HAL Id: hal-01141934 https://hal.archives-ouvertes.fr/hal-01141934 Submitted on 14 Apr 2015 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Mashup Architecture for Connecting Graphical Linux Applications Using a Software Bus Mohamed-Ikbel Gilles Coppin Franck Poirier Boulabiar Lab-STICC Lab-STICC Lab-STICC Telecom Bretagne, France University of Bretagne-Sud, Telecom Bretagne, France gilles.coppin France mohamed.boulabiar @telecom-bretagne.eu franck.poirier @telecom-bretagne.eu @univ-ubs.fr ABSTRACT functionalities and with different and redundant implemen- Although UNIX commands are simple, they can be com- tations that forced special users as designers to use a huge bined to accomplish complex tasks by piping the output of list of tools in order to accomplish a bigger task. In this one command, into another's input. -
Modeling of Hardware and Software for Specifying Hardware Abstraction
Modeling of Hardware and Software for specifying Hardware Abstraction Layers Yves Bernard, Cédric Gava, Cédrik Besseyre, Bertrand Crouzet, Laurent Marliere, Pierre Moreau, Samuel Rochet To cite this version: Yves Bernard, Cédric Gava, Cédrik Besseyre, Bertrand Crouzet, Laurent Marliere, et al.. Modeling of Hardware and Software for specifying Hardware Abstraction Layers. Embedded Real Time Software and Systems (ERTS2014), Feb 2014, Toulouse, France. hal-02272457 HAL Id: hal-02272457 https://hal.archives-ouvertes.fr/hal-02272457 Submitted on 27 Aug 2019 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Modeling of Hardware and Software for specifying Hardware Abstraction Layers Yves BERNARD1, Cédric GAVA2, Cédrik BESSEYRE1, Bertrand CROUZET1, Laurent MARLIERE1, Pierre MOREAU1, Samuel ROCHET2 (1) Airbus Operations SAS (2) Subcontractor for Airbus Operations SAS Abstract In this paper we describe a practical approach for modeling low level interfaces between software and hardware parts based on SysML operations. This method is intended to be applied for the development of drivers involved on what is classically called the “hardware abstraction layer” or the “basic software” which provide high level services for resources management on the top of a bare hardware platform. -
A Full Stack Approach to FPGA Integration in the Cloud
This article has been accepted for publication in a future issue of this journal, but has not been fully edited. Content may change prior to final publication. Citation information: DOI 10.1109/MM.2018.2877290, IEEE Micro THEME ARTICLE: HARDWARE ACCELERATION Galapagos: A Full Stack Approach to FPGA Integration in the Cloud Naif Tarafdar Field-Programmable Gate Arrays (FPGAs) have University of Toronto shown to be quite beneficial in the cloud due to their Nariman Eskandari energy-efficient application-specific acceleration. University of Toronto These accelerators have always been difficult to use Varun Sharma University of Toronto and at cloud scale, the difficulty of managing these Charles Lo devices scales accordingly. We approach the University of Toronto challenge of managing large FPGA accelerator Paul Chow clusters in the cloud using abstraction layers and a University of Toronto new hardware stack that we call Galapagos. The hardware stack abstracts low-level details while providing flexibility in the amount of low-level access users require to reach their performance needs. Computing today has evolved towards using large-scale data centers that are the basis of what many call the cloud. Within the cloud, large-scale applications for Big Data and machine learn- ing can use thousands of processors. At this scale, even small efficiency gains in performance and power consumption can translate to significant amounts. In the data center, power consump- tion is particularly important as 40 % of the costs are due to power and cooling [1]. Accelerators, which are more efficient for classes of computations, have become an important approach to ad- dressing both performance and power efficiency. -
Release Notes for X11R7.5 the X.Org Foundation 1
Release Notes for X11R7.5 The X.Org Foundation 1 October 2009 These release notes contains information about features and their status in the X.Org Foundation X11R7.5 release. Table of Contents Introduction to the X11R7.5 Release.................................................................................3 Summary of new features in X11R7.5...............................................................................3 Overview of X11R7.5............................................................................................................4 Details of X11R7.5 components..........................................................................................5 Build changes and issues..................................................................................................10 Miscellaneous......................................................................................................................11 Deprecated components and removal plans.................................................................12 Attributions/Acknowledgements/Credits......................................................................13 Introduction to the X11R7.5 Release This release is the sixth modular release of the X Window System. The next full release will be X11R7.6 and is expected in 2010. Unlike X11R1 through X11R6.9, X11R7.x releases are not built from one monolithic source tree, but many individual modules. These modules are distributed as individ- ual source code releases, and each one is released when it is ready, instead -
Thread Scheduling in Multi-Core Operating Systems Redha Gouicem
Thread Scheduling in Multi-core Operating Systems Redha Gouicem To cite this version: Redha Gouicem. Thread Scheduling in Multi-core Operating Systems. Computer Science [cs]. Sor- bonne Université, 2020. English. tel-02977242 HAL Id: tel-02977242 https://hal.archives-ouvertes.fr/tel-02977242 Submitted on 24 Oct 2020 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Ph.D thesis in Computer Science Thread Scheduling in Multi-core Operating Systems How to Understand, Improve and Fix your Scheduler Redha GOUICEM Sorbonne Université Laboratoire d’Informatique de Paris 6 Inria Whisper Team PH.D.DEFENSE: 23 October 2020, Paris, France JURYMEMBERS: Mr. Pascal Felber, Full Professor, Université de Neuchâtel Reviewer Mr. Vivien Quéma, Full Professor, Grenoble INP (ENSIMAG) Reviewer Mr. Rachid Guerraoui, Full Professor, École Polytechnique Fédérale de Lausanne Examiner Ms. Karine Heydemann, Associate Professor, Sorbonne Université Examiner Mr. Etienne Rivière, Full Professor, University of Louvain Examiner Mr. Gilles Muller, Senior Research Scientist, Inria Advisor Mr. Julien Sopena, Associate Professor, Sorbonne Université Advisor ABSTRACT In this thesis, we address the problem of schedulers for multi-core architectures from several perspectives: design (simplicity and correct- ness), performance improvement and the development of application- specific schedulers. -
Foot Prints Feel the Freedom of Fedora!
The Fedora Project: Foot Prints Feel The Freedom of Fedora! RRaahhuull SSuunnddaarraamm SSuunnddaarraamm@@ffeeddoorraapprroojjeecctt..oorrgg FFrreeee ((aass iinn ssppeeeecchh aanndd bbeeeerr)) AAddvviiccee 101011:: KKeeeepp iitt iinntteerraaccttiivvee!! Credit: Based on previous Fedora presentations from Red Hat and various community members. Using the age old wisdom and Indian, Free software tradition of standing on the shoulders of giants. Who the heck is Rahul? ( my favorite part of this presentation) ✔ Self elected Fedora project monkey and noisemaker ✔ Fedora Project Board Member ✔ Fedora Ambassadors steering committee member. ✔ Fedora Ambassador for India.. ✔ Editor for Fedora weekly reports. ✔ Fedora Websites, Documentation and Bug Triaging projects volunteer and miscellaneous few grunt work. Agenda ● Red Hat Linux to Fedora & RHEL - Why? ● What is Fedora ? ● What is the Fedora Project ? ● Who is behind the Fedora Project ? ● Primary Principles. ● What are the Fedora projects? ● Features, Future – Fedora Core 5 ... The beginning: Red Hat Linux 1994-2003 ● Released about every 6 months ● More stable “ .2” releases about every 18 months ● Rapid innovation ● Problems with retail channel sales model ● Impossible to support long-term ● Community Participation: ● Upstream Projects ● Beta Team / Bug Reporting The big split: Fedora and RHEL Red Hat had two separate, irreconcilable goals: ● To innovate rapidly. To provide stability for the long-term ● Red Hat Enterprise Linux (RHEL) ● Stable and supported for 7 years plus. A platform for 3rd party standardization ● Free as in speech ● Fedora Project / Fedora Core ● Rapid releases of Fedora Core, every 6 months ● Space to innovate. Fedora Core in the tradition of Red Hat Linux (“ FC1 == RHL10” ) Free as in speech, free as in beer, free as in community support ● Built and sponsored by Red Hat ● ...with increased community contributions. -
W4118 Operating Systems OS Overview
W4118 Operating Systems OS Overview Junfeng Yang Outline OS definitions OS abstractions/concepts OS structure OS evolution What is OS? A program that acts as an intermediary between a user of a computer and the computer hardware. User App stuff between OS HW Two popular definitions Top-down perspective: hardware abstraction layer , turn hardware into something that applications can use Bottom-up perspective: resource manager/coordinator , manage your computers resources OS = hardware abstraction layer standard library OS as virtual machine E.g. printf(hello world), shows up on screen App can make system calls to use OS services Why good? Ease of use : higher level of abstraction, easier to program Reusability : provide common functionality for reuse E.g. each app doesnt have to write a graphics driver Portability / Uniformity : stable, consistent interface, different OS/version/hardware look same E.g. scsi/ide/flash disks Why abstraction hard? What are the right abstractions ??? Too low level ? Lose advantages of abstraction Too high level? All apps pay overhead, even those dont need Worse, may work against some apps E.g. Database Next: example OS abstractions Two popular definitions Top-down perspective: hardware abstraction layer, turn hardware into something that applications can use Bottom-up perspective: resource manager/coordinator , manage your computers resources OS = resource manager/coordinator Computer has resources, OS must manage. Resource = CPU, Memory, disk, device, bandwidth, Shell ppt gcc browser System Call Interface CPU Memory File system scheduling management management OS Network Device Disk system stack drivers management CPU Memory Disk NIC Hardware OS = resource manager/coordinator (cont.) Why good? Sharing/Multiplexing : more than 1 app/user to use resource Protection : protect apps from each other, OS from app Who gets what when Performance : efficient/fair access to resources Why hard? Mechanisms v.s. -
Vypracovane Otazky K Bakalarskym Statnicim
Učební texty k státní bakalářské zkoušce Obecná informatika študenti MFF 15. augusta 2008 1 Vážený študent/čitateľ, toto je zbierka vypracovaných otázok pre bakalárske skúšky Informatikov. Otáz- ky boli vypracované študentmi MFF počas prípravy na tieto skúšky, a teda zatiaľ neboli overené kvalifikovanými osobami (profesormi/dokotorandmi mff atď.) - preto nie je žiadna záruka ich správnosti alebo úplnosti. Väčšina textov je vypracovaná v čestine resp. slovenčine, prosíme dodržujte túto konvenciu (a obmedzujte teda používanie napr. anglických textov). Ak nájdete ne- jakú chybu, nepresnosť alebo neúplnú informáciu - neváhajte kontaktovať adminis- trátora alebo niektorého z prispievateľov, ktorý má write-prístup k svn stromu, s opravou :-) Podobne - ak nájdete v „texteÿ veci ako ??? a TODO, znamená to že danú informáciu je potrebné skontrolovať, resp. doplniť... Texty je možné ďalej používať a šíriť pod licenciou GNU GFDL (čo pre všet- kých prispievajúcich znamená, že musia súhlasiť so zverejnením svojich úprav podľa tejto licencie). Veríme, že Vám tieto texty pomôžu k úspešnému zloženiu skúšok. Hlavní writeři :-) : • ajs • andree – http://andree.matfyz.cz/ • Hydrant • joshis / Petr Dvořák • kostej • nohis • tuetschek – http://tuetschek.wz.cz/ Úvodné verzie niektorých textov vznikli prepisom otázok vypracovaných „pí- somne na papierÿ, alebo inak ne-TEX-ovsky. Autormi týchto pôvodných verzií sú najmä nasledujúce osoby: gASK, Grafi, Kate (mat-15), Nytram, Oscar, Stando, xSty- ler. Časť je prebratá aj z pôvodných súborkových textov... Všetkým patrí naša/vaša vďaka. 2 Obsah 1 Logika 4 1.1 Logika – jazyk, formule, sémantika, tautologie . 4 1.2 Rozhodnutelnost, splnitelnost, pravdivost a dokazatelnost . 6 1.3 Věty o kompaktnosti a úplnosti výrokové a predikátové logiky . 11 1.4 Normální tvary výrokových formulí, prenexní tvary formulí prediká- tové logiky . -
The Pulseaudio Sound Server Linux.Conf.Au 2007
Introduction What is PulseAudio? Usage Internals Recipes Outlook The PulseAudio Sound Server linux.conf.au 2007 Lennart Poettering [email protected] Universit¨atHamburg, Department Informatik University of Hamburg, Department of Informatics Hamburg, Germany January 17th, 2007 Lennart Poettering The PulseAudio Sound Server 2 What is PulseAudio? 3 Usage 4 Internals 5 Recipes 6 Outlook Introduction What is PulseAudio? Usage Internals Recipes Outlook Contents 1 Introduction Lennart Poettering The PulseAudio Sound Server 3 Usage 4 Internals 5 Recipes 6 Outlook Introduction What is PulseAudio? Usage Internals Recipes Outlook Contents 1 Introduction 2 What is PulseAudio? Lennart Poettering The PulseAudio Sound Server 4 Internals 5 Recipes 6 Outlook Introduction What is PulseAudio? Usage Internals Recipes Outlook Contents 1 Introduction 2 What is PulseAudio? 3 Usage Lennart Poettering The PulseAudio Sound Server 5 Recipes 6 Outlook Introduction What is PulseAudio? Usage Internals Recipes Outlook Contents 1 Introduction 2 What is PulseAudio? 3 Usage 4 Internals Lennart Poettering The PulseAudio Sound Server 6 Outlook Introduction What is PulseAudio? Usage Internals Recipes Outlook Contents 1 Introduction 2 What is PulseAudio? 3 Usage 4 Internals 5 Recipes Lennart Poettering The PulseAudio Sound Server Introduction What is PulseAudio? Usage Internals Recipes Outlook Contents 1 Introduction 2 What is PulseAudio? 3 Usage 4 Internals 5 Recipes 6 Outlook Lennart Poettering The PulseAudio Sound Server Introduction What is PulseAudio? Usage Internals Recipes Outlook Who Am I? Student (Computer Science) from Hamburg, Germany Core Developer of PulseAudio, Avahi and a few other Free Software projects http://0pointer.de/lennart/ [email protected] IRC: mezcalero Lennart Poettering The PulseAudio Sound Server Introduction What is PulseAudio? Usage Internals Recipes Outlook Introduction Lennart Poettering The PulseAudio Sound Server It’s a mess! There are just too many widely adopted but competing and incompatible sound systems. -
Web Applications and the Hardware Abstraction Layer
Web Applications Dilles, 09 Web Applications and the Evolution of the Hardware Abstraction Layer Jacob Dilles George Mason University March 15 2009 A computer is defined as a machine that manipulates data according to a list of instructions, however it has come to mean something more. Operating a modern Core class possessor that can perform 2.4 billion 64-bit operations per second (Intel Corporation, 2009) by listing one instruction at a time would not be very useful. However the first 1960 era computers, like the ENIAC, were only programmable with machine- code instructions entered by hand using switches and patch cables. This was not a significant problem at the time, when the longest program was 304 batch-operated instructions, took days to write and 5 to 10 seconds to run, and the punched card reader limited data input rate to 250 bytes per second. (Ballistic Research Laboratories, 1955). However computers grew more capable at an exponential rate while steadily decreasing in cost. By 1970 machines, like the relativity affordable DEC PDP-7 that were capable of fairly advanced timesharing, expedited the development of the operating system - an interface between the physical computer hardware and an abstract environment that allows more than one program to be run simultaneously. Due to the wide variety of hardware architecture at the time, early operating systems had to be written for a specific machine, and were not consistent or interchangeable between computer manufactures and models. In 1973 the Unix operating system developed at Bell Laboratories was ported from PDP-11/20 assembly to the C programming language, and 1 Web Applications Dilles, 09 could be used on any machine with a C compiler with minimal modification.