Cutting Out the Middleman: OS-Level Support for X10 Activities - - PowerPoint PPT Presentation

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Cutting Out the Middleman: OS-Level Support for X10 Activities - - PowerPoint PPT Presentation

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Cutting Out the Middleman: OS-Level Support for X10 Activities Manuel Mohr, Sebastian Buchwald, Andreas Zwinkau, Christoph Erhardt, Benjamin Oechslein, Jens Schedel, Daniel Lohmann Chair for Programming Paradigms, Karlsruhe Institute of

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June 14, 2015 Manuel Mohr, Sebastian Buchwald, Andreas Zwinkau, Christoph Erhardt, Benjamin Oechslein, Jens Schedel, Daniel Lohmann – Cutting Out the Middleman: OS-Level Support for X10 Activities IPD, CS4

Chair for Programming Paradigms, Karlsruhe Institute of Technology (KIT) & System Software Group, University Erlangen-Nuremberg (FAU)

Cutting Out the Middleman: OS-Level Support for X10 Activities

Manuel Mohr, Sebastian Buchwald, Andreas Zwinkau, Christoph Erhardt, Benjamin Oechslein, Jens Schedel, Daniel Lohmann

KIT – University of the State of Baden-Wuerttemberg and National Research Center of the Helmholtz Association

www.kit.edu

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Ideal World

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June 14, 2015 Manuel Mohr, Sebastian Buchwald, Andreas Zwinkau, Christoph Erhardt, Benjamin Oechslein, Jens Schedel, Daniel Lohmann – Cutting Out the Middleman: OS-Level Support for X10 Activities IPD, CS4

X10 OS HW

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Ideal World

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June 14, 2015 Manuel Mohr, Sebastian Buchwald, Andreas Zwinkau, Christoph Erhardt, Benjamin Oechslein, Jens Schedel, Daniel Lohmann – Cutting Out the Middleman: OS-Level Support for X10 Activities IPD, CS4

X10 OS HW

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SLIDE 4

Ideal World

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June 14, 2015 Manuel Mohr, Sebastian Buchwald, Andreas Zwinkau, Christoph Erhardt, Benjamin Oechslein, Jens Schedel, Daniel Lohmann – Cutting Out the Middleman: OS-Level Support for X10 Activities IPD, CS4

X10 OS HW

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Current Practice

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June 14, 2015 Manuel Mohr, Sebastian Buchwald, Andreas Zwinkau, Christoph Erhardt, Benjamin Oechslein, Jens Schedel, Daniel Lohmann – Cutting Out the Middleman: OS-Level Support for X10 Activities IPD, CS4

X10 RT OS HW

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Current Practice

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June 14, 2015 Manuel Mohr, Sebastian Buchwald, Andreas Zwinkau, Christoph Erhardt, Benjamin Oechslein, Jens Schedel, Daniel Lohmann – Cutting Out the Middleman: OS-Level Support for X10 Activities IPD, CS4

X10 RT OS HW

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Current Practice

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June 14, 2015 Manuel Mohr, Sebastian Buchwald, Andreas Zwinkau, Christoph Erhardt, Benjamin Oechslein, Jens Schedel, Daniel Lohmann – Cutting Out the Middleman: OS-Level Support for X10 Activities IPD, CS4

X10 RT OS HW

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Current Practice

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June 14, 2015 Manuel Mohr, Sebastian Buchwald, Andreas Zwinkau, Christoph Erhardt, Benjamin Oechslein, Jens Schedel, Daniel Lohmann – Cutting Out the Middleman: OS-Level Support for X10 Activities IPD, CS4

X10 RT OS HW s❧❡❡♣✭✶✵✵✮

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Current Practice

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June 14, 2015 Manuel Mohr, Sebastian Buchwald, Andreas Zwinkau, Christoph Erhardt, Benjamin Oechslein, Jens Schedel, Daniel Lohmann – Cutting Out the Middleman: OS-Level Support for X10 Activities IPD, CS4

X10 RT OS HW s❧❡❡♣✭✶✵✵✮

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Workaround

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June 14, 2015 Manuel Mohr, Sebastian Buchwald, Andreas Zwinkau, Christoph Erhardt, Benjamin Oechslein, Jens Schedel, Daniel Lohmann – Cutting Out the Middleman: OS-Level Support for X10 Activities IPD, CS4

❝❧❛ss ❘✉♥t✐♠❡ ④ ♣✉❜❧✐❝ st❛t✐❝ ❞❡❢ s❧❡❡♣✭♠✐❧❧✐s✿▲♦♥❣✮ ④ ❘✉♥t✐♠❡✳ ✐♥❝r❡❛s❡P❛r❛❧❧❡❧✐s♠ ✭✮❀ ❚❤r❡❛❞✳s❧❡❡♣✭♠✐❧❧✐s ✮❀ ❘✉♥t✐♠❡✳ ❞❡❝r❡❛s❡P❛r❛❧❧❡❧✐s♠ ✭✶✮❀ ⑥ ⑥

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Workaround in Action

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June 14, 2015 Manuel Mohr, Sebastian Buchwald, Andreas Zwinkau, Christoph Erhardt, Benjamin Oechslein, Jens Schedel, Daniel Lohmann – Cutting Out the Middleman: OS-Level Support for X10 Activities IPD, CS4

X10 RT OS HW

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Workaround in Action

5

June 14, 2015 Manuel Mohr, Sebastian Buchwald, Andreas Zwinkau, Christoph Erhardt, Benjamin Oechslein, Jens Schedel, Daniel Lohmann – Cutting Out the Middleman: OS-Level Support for X10 Activities IPD, CS4

X10 RT OS s❧❡❡♣✭✶✵✵✮ HW

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SLIDE 13

Workaround in Action

5

June 14, 2015 Manuel Mohr, Sebastian Buchwald, Andreas Zwinkau, Christoph Erhardt, Benjamin Oechslein, Jens Schedel, Daniel Lohmann – Cutting Out the Middleman: OS-Level Support for X10 Activities IPD, CS4

X10 RT OS s❧❡❡♣✭✶✵✵✮ HW

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SLIDE 14

Workaround in Action

5

June 14, 2015 Manuel Mohr, Sebastian Buchwald, Andreas Zwinkau, Christoph Erhardt, Benjamin Oechslein, Jens Schedel, Daniel Lohmann – Cutting Out the Middleman: OS-Level Support for X10 Activities IPD, CS4

X10 RT OS s❧❡❡♣✭✶✵✵✮ HW

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Workaround in Action

5

June 14, 2015 Manuel Mohr, Sebastian Buchwald, Andreas Zwinkau, Christoph Erhardt, Benjamin Oechslein, Jens Schedel, Daniel Lohmann – Cutting Out the Middleman: OS-Level Support for X10 Activities IPD, CS4

X10 RT OS s❧❡❡♣✭✶✵✵✮ HW

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Motivation

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June 14, 2015 Manuel Mohr, Sebastian Buchwald, Andreas Zwinkau, Christoph Erhardt, Benjamin Oechslein, Jens Schedel, Daniel Lohmann – Cutting Out the Middleman: OS-Level Support for X10 Activities IPD, CS4

Problems with user-level scheduling approach: Complexity: interplay between two schedulers Performance: starting/stopping kernel-level threads is expensive Bugs: what if starting/stopping is forgotten? (e.g., user code)

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SLIDE 17

Motivation

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June 14, 2015 Manuel Mohr, Sebastian Buchwald, Andreas Zwinkau, Christoph Erhardt, Benjamin Oechslein, Jens Schedel, Daniel Lohmann – Cutting Out the Middleman: OS-Level Support for X10 Activities IPD, CS4

Problems with user-level scheduling approach: Complexity: interplay between two schedulers Performance: starting/stopping kernel-level threads is expensive Bugs: what if starting/stopping is forgotten? (e.g., user code) ⇒ Why not activity = OS-level primitive?

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Motivation

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June 14, 2015 Manuel Mohr, Sebastian Buchwald, Andreas Zwinkau, Christoph Erhardt, Benjamin Oechslein, Jens Schedel, Daniel Lohmann – Cutting Out the Middleman: OS-Level Support for X10 Activities IPD, CS4

Problems with user-level scheduling approach: Complexity: interplay between two schedulers Performance: starting/stopping kernel-level threads is expensive Bugs: what if starting/stopping is forgotten? (e.g., user code) ⇒ Why not activity = OS-level primitive? In this talk: How we directly mapped activities to OS primitives

Context: many-core hardware architecture

How this simplifies runtime system and OS Initial evaluation of system efficiency

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Tiled Many-Core Architectures

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June 14, 2015 Manuel Mohr, Sebastian Buchwald, Andreas Zwinkau, Christoph Erhardt, Benjamin Oechslein, Jens Schedel, Daniel Lohmann – Cutting Out the Middleman: OS-Level Support for X10 Activities IPD, CS4

Core Core Core Core

Memory Cache

10 Core Core Core Core

Memory Cache

11 Core Core Core Core

Memory Cache

00 Core Core Core Core

Memory Cache

01

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Tiled Many-Core Architectures

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June 14, 2015 Manuel Mohr, Sebastian Buchwald, Andreas Zwinkau, Christoph Erhardt, Benjamin Oechslein, Jens Schedel, Daniel Lohmann – Cutting Out the Middleman: OS-Level Support for X10 Activities IPD, CS4

Core Core Core Core

Memory Cache

10 Core Core Core Core

Memory Cache

11 Core Core Core Core

Memory Cache

00 Core Core Core Core

Memory Cache

01

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OctoPOS

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June 14, 2015 Manuel Mohr, Sebastian Buchwald, Andreas Zwinkau, Christoph Erhardt, Benjamin Oechslein, Jens Schedel, Daniel Lohmann – Cutting Out the Middleman: OS-Level Support for X10 Activities IPD, CS4

OS designed for many-core PGAS architectures

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OctoPOS

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June 14, 2015 Manuel Mohr, Sebastian Buchwald, Andreas Zwinkau, Christoph Erhardt, Benjamin Oechslein, Jens Schedel, Daniel Lohmann – Cutting Out the Middleman: OS-Level Support for X10 Activities IPD, CS4

OS designed for many-core PGAS architectures PGAS Architecture ⇒ One OS instance per place ⇒ Message passing

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OctoPOS

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June 14, 2015 Manuel Mohr, Sebastian Buchwald, Andreas Zwinkau, Christoph Erhardt, Benjamin Oechslein, Jens Schedel, Daniel Lohmann – Cutting Out the Middleman: OS-Level Support for X10 Activities IPD, CS4

OS designed for many-core PGAS architectures Many-Core ⇒ Enough cores for exclusive allocation ⇒ Cooperative scheduling instead

  • f preemption

PGAS Architecture ⇒ One OS instance per place ⇒ Message passing

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OctoPOS

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June 14, 2015 Manuel Mohr, Sebastian Buchwald, Andreas Zwinkau, Christoph Erhardt, Benjamin Oechslein, Jens Schedel, Daniel Lohmann – Cutting Out the Middleman: OS-Level Support for X10 Activities IPD, CS4

OS designed for many-core PGAS architectures Many-Core ⇒ Enough cores for exclusive allocation ⇒ Cooperative scheduling instead

  • f preemption

PGAS Architecture ⇒ One OS instance per place ⇒ Message passing User-level-like scheduler in the kernel

Cooperative FIFO scheduling

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OctoPOS

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June 14, 2015 Manuel Mohr, Sebastian Buchwald, Andreas Zwinkau, Christoph Erhardt, Benjamin Oechslein, Jens Schedel, Daniel Lohmann – Cutting Out the Middleman: OS-Level Support for X10 Activities IPD, CS4

OS designed for many-core PGAS architectures Many-Core ⇒ Enough cores for exclusive allocation ⇒ Cooperative scheduling instead

  • f preemption

PGAS Architecture ⇒ One OS instance per place ⇒ Message passing User-level-like scheduler in the kernel

Cooperative FIFO scheduling

⇒ Very lightweight threads called i-lets

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Async

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June 14, 2015 Manuel Mohr, Sebastian Buchwald, Andreas Zwinkau, Christoph Erhardt, Benjamin Oechslein, Jens Schedel, Daniel Lohmann – Cutting Out the Middleman: OS-Level Support for X10 Activities IPD, CS4

X10 RT OS HW

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Async

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June 14, 2015 Manuel Mohr, Sebastian Buchwald, Andreas Zwinkau, Christoph Erhardt, Benjamin Oechslein, Jens Schedel, Daniel Lohmann – Cutting Out the Middleman: OS-Level Support for X10 Activities IPD, CS4

X10 RT OS HW

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SLIDE 28

Async

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June 14, 2015 Manuel Mohr, Sebastian Buchwald, Andreas Zwinkau, Christoph Erhardt, Benjamin Oechslein, Jens Schedel, Daniel Lohmann – Cutting Out the Middleman: OS-Level Support for X10 Activities IPD, CS4

X10 RT OS HW Each activity corresponds to exactly one i-let Very thin runtime system, no user-level scheduler Blocking calls unproblematic, no workaround needed

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Remote i-let spawning

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June 14, 2015 Manuel Mohr, Sebastian Buchwald, Andreas Zwinkau, Christoph Erhardt, Benjamin Oechslein, Jens Schedel, Daniel Lohmann – Cutting Out the Middleman: OS-Level Support for X10 Activities IPD, CS4

s♣❛✇♥❴✐❧❡t✭♣❧❛❝❡❴✐❞✱ ✐❧❡t✮ Start an i-let on a different place Asynchronous

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Small At Async Statement: ❛t ✭❇✮ ❛s②♥❝ ❙

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June 14, 2015 Manuel Mohr, Sebastian Buchwald, Andreas Zwinkau, Christoph Erhardt, Benjamin Oechslein, Jens Schedel, Daniel Lohmann – Cutting Out the Middleman: OS-Level Support for X10 Activities IPD, CS4

i-let ❇ exec ❙

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Small At Async Statement: ❛t ✭❇✮ ❛s②♥❝ ❙

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June 14, 2015 Manuel Mohr, Sebastian Buchwald, Andreas Zwinkau, Christoph Erhardt, Benjamin Oechslein, Jens Schedel, Daniel Lohmann – Cutting Out the Middleman: OS-Level Support for X10 Activities IPD, CS4

i-let ❇ exec ❙

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Small At Async Statement: ❛t ✭❇✮ ❛s②♥❝ ❙

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June 14, 2015 Manuel Mohr, Sebastian Buchwald, Andreas Zwinkau, Christoph Erhardt, Benjamin Oechslein, Jens Schedel, Daniel Lohmann – Cutting Out the Middleman: OS-Level Support for X10 Activities IPD, CS4

i-let ❇ exec ❙

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Small At Async Statement: ❛t ✭❇✮ ❛s②♥❝ ❙

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June 14, 2015 Manuel Mohr, Sebastian Buchwald, Andreas Zwinkau, Christoph Erhardt, Benjamin Oechslein, Jens Schedel, Daniel Lohmann – Cutting Out the Middleman: OS-Level Support for X10 Activities IPD, CS4

i-let ❇ exec ❙ global termination

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Push DMA Transfer

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June 14, 2015 Manuel Mohr, Sebastian Buchwald, Andreas Zwinkau, Christoph Erhardt, Benjamin Oechslein, Jens Schedel, Daniel Lohmann – Cutting Out the Middleman: OS-Level Support for X10 Activities IPD, CS4

♣✉s❤❴❞♠❛✭♣❧❛❝❡❴✐❞✱ ❞❛t❛✱ ❧❡♥❣t❤✱ s❡♥❞❡r❴✐❧❡t✱ r❡❝❡✐✈❡r❴✐❧❡t✮ Copy memory block to different place Specify actions to be executed when transfer is finished Asynchronous, HW support

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At Async Statement: ❛t ✭❇✮ ❛s②♥❝ ❙

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June 14, 2015 Manuel Mohr, Sebastian Buchwald, Andreas Zwinkau, Christoph Erhardt, Benjamin Oechslein, Jens Schedel, Daniel Lohmann – Cutting Out the Middleman: OS-Level Support for X10 Activities IPD, CS4

i-let ❆ DMA ❇ exec ❙

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At Async Statement: ❛t ✭❇✮ ❛s②♥❝ ❙

13

June 14, 2015 Manuel Mohr, Sebastian Buchwald, Andreas Zwinkau, Christoph Erhardt, Benjamin Oechslein, Jens Schedel, Daniel Lohmann – Cutting Out the Middleman: OS-Level Support for X10 Activities IPD, CS4

i-let ❆ DMA ❇ exec ❙

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SLIDE 37

At Async Statement: ❛t ✭❇✮ ❛s②♥❝ ❙

13

June 14, 2015 Manuel Mohr, Sebastian Buchwald, Andreas Zwinkau, Christoph Erhardt, Benjamin Oechslein, Jens Schedel, Daniel Lohmann – Cutting Out the Middleman: OS-Level Support for X10 Activities IPD, CS4

i-let ❆ DMA ❇ exec ❙

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SLIDE 38

At Async Statement: ❛t ✭❇✮ ❛s②♥❝ ❙

13

June 14, 2015 Manuel Mohr, Sebastian Buchwald, Andreas Zwinkau, Christoph Erhardt, Benjamin Oechslein, Jens Schedel, Daniel Lohmann – Cutting Out the Middleman: OS-Level Support for X10 Activities IPD, CS4

i-let ❆ DMA ❇ exec ❙

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SLIDE 39

At Async Statement: ❛t ✭❇✮ ❛s②♥❝ ❙

13

June 14, 2015 Manuel Mohr, Sebastian Buchwald, Andreas Zwinkau, Christoph Erhardt, Benjamin Oechslein, Jens Schedel, Daniel Lohmann – Cutting Out the Middleman: OS-Level Support for X10 Activities IPD, CS4

i-let ❆ DMA ❇ exec ❙

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SLIDE 40

At Async Statement: ❛t ✭❇✮ ❛s②♥❝ ❙

13

June 14, 2015 Manuel Mohr, Sebastian Buchwald, Andreas Zwinkau, Christoph Erhardt, Benjamin Oechslein, Jens Schedel, Daniel Lohmann – Cutting Out the Middleman: OS-Level Support for X10 Activities IPD, CS4

i-let ❆ DMA ❇ exec ❙

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SLIDE 41

At Async Statement: ❛t ✭❇✮ ❛s②♥❝ ❙

13

June 14, 2015 Manuel Mohr, Sebastian Buchwald, Andreas Zwinkau, Christoph Erhardt, Benjamin Oechslein, Jens Schedel, Daniel Lohmann – Cutting Out the Middleman: OS-Level Support for X10 Activities IPD, CS4

i-let ❆ DMA ❇ exec ❙ global termination

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Evaluation

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June 14, 2015 Manuel Mohr, Sebastian Buchwald, Andreas Zwinkau, Christoph Erhardt, Benjamin Oechslein, Jens Schedel, Daniel Lohmann – Cutting Out the Middleman: OS-Level Support for X10 Activities IPD, CS4

Benchmarks on FPGA-based prototype hardware

4 places with 4 cores each 25 MHz

s♣❛✇♥❴✐❧❡t✭✵✱ ✐❧❡t✮ ❛s②♥❝ ④ ⑥ s♣❛✇♥❴✐❧❡t✭✶✱ ✐❧❡t✮ ❛t ✭P❧❛❝❡✭✶✮✮ ❛s②♥❝ ④ ⑥

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Evaluation

14

June 14, 2015 Manuel Mohr, Sebastian Buchwald, Andreas Zwinkau, Christoph Erhardt, Benjamin Oechslein, Jens Schedel, Daniel Lohmann – Cutting Out the Middleman: OS-Level Support for X10 Activities IPD, CS4

Benchmarks on FPGA-based prototype hardware

4 places with 4 cores each 25 MHz

Measurements (in clock cyles): s♣❛✇♥❴✐❧❡t✭✵✱ ✐❧❡t✮ ❛s②♥❝ ④ ⑥ s♣❛✇♥❴✐❧❡t✭✶✱ ✐❧❡t✮ ❛t ✭P❧❛❝❡✭✶✮✮ ❛s②♥❝ ④ ⑥

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SLIDE 44

Evaluation

14

June 14, 2015 Manuel Mohr, Sebastian Buchwald, Andreas Zwinkau, Christoph Erhardt, Benjamin Oechslein, Jens Schedel, Daniel Lohmann – Cutting Out the Middleman: OS-Level Support for X10 Activities IPD, CS4

Benchmarks on FPGA-based prototype hardware

4 places with 4 cores each 25 MHz

Measurements (in clock cyles): s♣❛✇♥❴✐❧❡t✭✵✱ ✐❧❡t✮ ❛s②♥❝ ④ ⑥ 539 1469 s♣❛✇♥❴✐❧❡t✭✶✱ ✐❧❡t✮ ❛t ✭P❧❛❝❡✭✶✮✮ ❛s②♥❝ ④ ⑥ 1133 1981

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Evaluation

14

June 14, 2015 Manuel Mohr, Sebastian Buchwald, Andreas Zwinkau, Christoph Erhardt, Benjamin Oechslein, Jens Schedel, Daniel Lohmann – Cutting Out the Middleman: OS-Level Support for X10 Activities IPD, CS4

Benchmarks on FPGA-based prototype hardware

4 places with 4 cores each 25 MHz

Measurements (in clock cyles): s♣❛✇♥❴✐❧❡t✭✵✱ ✐❧❡t✮ ❛s②♥❝ ④ ⑥ 539 1469 s♣❛✇♥❴✐❧❡t✭✶✱ ✐❧❡t✮ ❛t ✭P❧❛❝❡✭✶✮✮ ❛s②♥❝ ④ ⑥ 1133 1981 Operations are cheap (in absolute numbers)

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Conclusion & Future Work

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June 14, 2015 Manuel Mohr, Sebastian Buchwald, Andreas Zwinkau, Christoph Erhardt, Benjamin Oechslein, Jens Schedel, Daniel Lohmann – Cutting Out the Middleman: OS-Level Support for X10 Activities IPD, CS4

We have: Implemented X10 activity management without a user-level scheduler

Possible by exclusively allocating cores and using cooperative scheduling Essentially puts user-level-like scheduler into kernel

Adapted the X10 runtime Evaluated the efficiency on a prototype many-core architecture

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SLIDE 47

Conclusion & Future Work

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June 14, 2015 Manuel Mohr, Sebastian Buchwald, Andreas Zwinkau, Christoph Erhardt, Benjamin Oechslein, Jens Schedel, Daniel Lohmann – Cutting Out the Middleman: OS-Level Support for X10 Activities IPD, CS4

We have: Implemented X10 activity management without a user-level scheduler

Possible by exclusively allocating cores and using cooperative scheduling Essentially puts user-level-like scheduler into kernel

Adapted the X10 runtime Evaluated the efficiency on a prototype many-core architecture We plan to: Port OctoPOS to AMD64 NUMA systems (in progress) Evaluate against common Linux-MPI implementations

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SLIDE 48

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June 14, 2015 Manuel Mohr, Sebastian Buchwald, Andreas Zwinkau, Christoph Erhardt, Benjamin Oechslein, Jens Schedel, Daniel Lohmann – Cutting Out the Middleman: OS-Level Support for X10 Activities IPD, CS4

Backup Slides

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SLIDE 49

At Expression: ❛t ✭❇✮ ❊

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June 14, 2015 Manuel Mohr, Sebastian Buchwald, Andreas Zwinkau, Christoph Erhardt, Benjamin Oechslein, Jens Schedel, Daniel Lohmann – Cutting Out the Middleman: OS-Level Support for X10 Activities IPD, CS4

i-let ❆ DMA ❇ exec ❛t body

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SLIDE 50

At Expression: ❛t ✭❇✮ ❊

17

June 14, 2015 Manuel Mohr, Sebastian Buchwald, Andreas Zwinkau, Christoph Erhardt, Benjamin Oechslein, Jens Schedel, Daniel Lohmann – Cutting Out the Middleman: OS-Level Support for X10 Activities IPD, CS4

i-let ❆ DMA ❇ exec ❛t body

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SLIDE 51

At Expression: ❛t ✭❇✮ ❊

17

June 14, 2015 Manuel Mohr, Sebastian Buchwald, Andreas Zwinkau, Christoph Erhardt, Benjamin Oechslein, Jens Schedel, Daniel Lohmann – Cutting Out the Middleman: OS-Level Support for X10 Activities IPD, CS4

i-let ❆ DMA ❇ blocks until loc. term. exec ❛t body

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SLIDE 52

At Expression: ❛t ✭❇✮ ❊

17

June 14, 2015 Manuel Mohr, Sebastian Buchwald, Andreas Zwinkau, Christoph Erhardt, Benjamin Oechslein, Jens Schedel, Daniel Lohmann – Cutting Out the Middleman: OS-Level Support for X10 Activities IPD, CS4

i-let ❆ DMA ❇ blocks until loc. term. exec ❛t body

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SLIDE 53

At Expression: ❛t ✭❇✮ ❊

17

June 14, 2015 Manuel Mohr, Sebastian Buchwald, Andreas Zwinkau, Christoph Erhardt, Benjamin Oechslein, Jens Schedel, Daniel Lohmann – Cutting Out the Middleman: OS-Level Support for X10 Activities IPD, CS4

i-let ❆ DMA ❇ blocks until loc. term. exec ❛t body

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SLIDE 54

At Expression: ❛t ✭❇✮ ❊

17

June 14, 2015 Manuel Mohr, Sebastian Buchwald, Andreas Zwinkau, Christoph Erhardt, Benjamin Oechslein, Jens Schedel, Daniel Lohmann – Cutting Out the Middleman: OS-Level Support for X10 Activities IPD, CS4

i-let ❆ DMA ❇ blocks until loc. term. exec ❛t body

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SLIDE 55

At Expression: ❛t ✭❇✮ ❊

17

June 14, 2015 Manuel Mohr, Sebastian Buchwald, Andreas Zwinkau, Christoph Erhardt, Benjamin Oechslein, Jens Schedel, Daniel Lohmann – Cutting Out the Middleman: OS-Level Support for X10 Activities IPD, CS4

i-let ❆ DMA ❇ blocks until loc. term. exec ❛t body

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At Expression: ❛t ✭❇✮ ❊

17

June 14, 2015 Manuel Mohr, Sebastian Buchwald, Andreas Zwinkau, Christoph Erhardt, Benjamin Oechslein, Jens Schedel, Daniel Lohmann – Cutting Out the Middleman: OS-Level Support for X10 Activities IPD, CS4

i-let ❆ DMA ❇ blocks until loc. term. exec ❛t body

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SLIDE 57

At Expression: ❛t ✭❇✮ ❊

17

June 14, 2015 Manuel Mohr, Sebastian Buchwald, Andreas Zwinkau, Christoph Erhardt, Benjamin Oechslein, Jens Schedel, Daniel Lohmann – Cutting Out the Middleman: OS-Level Support for X10 Activities IPD, CS4

i-let ❆ DMA ❇ blocks until loc. term. exec ❛t body

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SLIDE 58

At Expression: ❛t ✭❇✮ ❊

17

June 14, 2015 Manuel Mohr, Sebastian Buchwald, Andreas Zwinkau, Christoph Erhardt, Benjamin Oechslein, Jens Schedel, Daniel Lohmann – Cutting Out the Middleman: OS-Level Support for X10 Activities IPD, CS4

i-let ❆ DMA ❇ blocks until loc. term. exec ❛t body

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At Expression: ❛t ✭❇✮ ❊

17

June 14, 2015 Manuel Mohr, Sebastian Buchwald, Andreas Zwinkau, Christoph Erhardt, Benjamin Oechslein, Jens Schedel, Daniel Lohmann – Cutting Out the Middleman: OS-Level Support for X10 Activities IPD, CS4

i-let ❆ DMA ❇ blocks until loc. term. exec ❛t body loc. term.

slide-60
SLIDE 60

At Expression: ❛t ✭❇✮ ❊

17

June 14, 2015 Manuel Mohr, Sebastian Buchwald, Andreas Zwinkau, Christoph Erhardt, Benjamin Oechslein, Jens Schedel, Daniel Lohmann – Cutting Out the Middleman: OS-Level Support for X10 Activities IPD, CS4

i-let ❆ DMA ❇ blocks until loc. term. exec ❛t body loc. term.

slide-61
SLIDE 61

At Expression: ❛t ✭❇✮ ❊

17

June 14, 2015 Manuel Mohr, Sebastian Buchwald, Andreas Zwinkau, Christoph Erhardt, Benjamin Oechslein, Jens Schedel, Daniel Lohmann – Cutting Out the Middleman: OS-Level Support for X10 Activities IPD, CS4

i-let ❆ DMA ❇ blocks until loc. term. exec ❛t body loc. term.

  • glob. term.