89 research outputs found
pszufe/OSMToolset.jl: v0.1.1
No full text<h2>OSMToolset v0.1.1</h2>
<p><a href="https://github.com/pszufe/OSMToolset.jl/compare/v0.1.0...v0.1.1">Diff since v0.1.0</a></p>
pszufe/OSMToolset.jl: v0.1.2
No full text<h2>OSMToolset v0.1.2</h2>
<p><a href="https://github.com/pszufe/OSMToolset.jl/compare/v0.1.1...v0.1.2">Diff since v0.1.1</a></p>
Caribbean Report 14-02-1989
No full textThe controversy of book “The Satanic Verses” by Indian born, British author Salman Rushdie continues with the death sentence passed by Iran’s Ayatollah Khomeni. There are strong reactions from Muslims in the Caribbean region. Brinsley Samaroo, Minister in the Trinidad and Tobago government does not support this response as he wishes to see people commenting on the book after having themselves read it. Grenada Deputy Prime Minister, Ben Jones who was in London and participated in the Independence Day celebrations speaks on developments for the island's next election. Jones rejects accusations that the Grenadian government is weakening the trade union movement. On other trade issues, an emergency meeting was called by the International Cocoa Organization to settle the mounting debts encumbered by producers. In Haiti, President Prosper Avril invites twenty-three organizations to discuss the setting up of an institution that will organize and supervise a free elections.1. Headlines: Iran's Ayatollah Khomeni sentences author, Salman Rushdie to death for blasphemy and insults to Muslims; Grenada Deputy Prime Minister, Ben Jones reacts to accusations that his goverment is weakening trade unions; and, the International Cocoa Organization calls an emergency meeting to avert a cocoa crisis (00:00-00:35)2. Interview with Salman Rushdie, author of "The Satanic Verses" on the death sentence passed by Ayatollah Khomeni (00:36-01:50)3. Interview with Brinsley Samaroo, Minister in the Trinidad and Tobago government on reactions to the book "The Satanic Verses" in the region (01:51-03:56)4. Interview with Ben Jones, Grenada's Deputy Prime Minister who was in London and participates in the Independence Day celebrations. Jones rejects accusations that the Grenadian government is weakening the trade unions. Jones also speaks on developments for the next election (03:57-08:40)5. Financial News (08:41-10:10)6. Robin Stainer reports that the International Cocoa Organization emergency meeting is to settle the mounting debts encumbered by producers (10:11-12:27)7. President Prosper Avril of Haiti invites twenty-three organisations to discuss the setting up of an institution that will organise and supervise a free election (12:28-14:56
Dynamic Task Scheduling with Data Dependency Awareness Using Julia
No full textDynamic task scheduling is vital for optimizing performance and resource utilization, particularly in heterogeneous computing environments. The LLVM-based Julia programming language offers a unique opportunity for developing efficient task-based runtime systems. This paper introduces the Dagger. jl package, a Julia-native implementation for dynamic task scheduling with data dependency awareness. We design a high-performance scheduler that leverages Julia's type inference capabilities to support various computational tasks and data types. Our approach provides an unified API, facilitating the development and deployment of applications across different architectures. We evaluate the performance and overhead of Dagger through several tiled dense linear algebra computations on shared memory systems. Notably, our results show that Dagger with data dependency awareness outperforms other parallel paradigms in Julia and achieves performance comparable to vendor-optimized operations. Dagger also leverages the implementation of the QR communication-avoiding algorithm, delivering significant performance improvements, and highlighting its potential for scalable and efficient parallel computing.This material is based upon work supported by the National Science Foundation under grant no. OAC-1835443, grant no. SII-2029670, grant no. ECCS-2029670, grant no. OAC-2103804, and grant no. PHY-2021825. The information, data, or work presented herein was funded in part by the Advanced Research Projects Agency-Energy (ARPA-E), U.S. Department of Energy, under Award Number DE-AR0001211 and DE-AR0001222. The views and opinions of authors expressed herein do not necessarily state or reflect those of the United States Government or any agency thereof. This material was supported by the Research Council of Norway and Equinor ASA through Research Council project "308817 - Digital wells for optimal production and drainage". Research was sponsored by the United States Air Force Research Laboratory and the United States Air Force Artificial Intelligence Accelerator and was accomplished under Cooperative Agreement Number FA8750-19-2-1000. The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the official policies, either expressed or implied, of the United States Air Force or the U.S. Government. The U.S. Government is authorized to reproduce and distribute reprints for Government purposes notwithstanding any copyright notation herein. The authors would like to also thank the support and resources provided by KAUST. This material is also supported by grant #2022/07810-7, São Paulo Research Foundation (FAPESP), furthermore the opinions, hypotheses, conclusions, or recommendations expressed in this material are the responsibility of the authors and do not necessarily reflect the views of FAPESP. Additionally, authors extend their appreciation to the KAUST Ibn Rushd Fellowship and the São Paulo Research Foundation for their support
Coolie cartography: crossing frontiers through coolitude
No full textFollowing the abolition of Transatlantic slavery, the British introduced a new scheme of labour to replace the former. 'Indian indentureship', as it was referred to, affected nearly 2 million Indian coolies who defied the traditional ban against crossing the kala pani (dark waters) in order to work on plantations in countries such as British Guiana, Trinidad, Malaya, South Africa and Fiji. In effect, the Indian labour: diaspora emerged and established itself across the globe. Despite over 100 years of labouring and contributing to the development of their new homes, the coolies and their descendents still face political, social and cultural marginalization. The aim of this thesis is to explore the consequences of indentureship in various societies through a parallelization of inter-national coolie conditions as represented by writers of the diaspora. The three areas selected for this study are Guyana, Malaysia and Fiji. David Dabydeen (Guyana), K.S.Maniam (Malaysia) and Satendra Nandan (Fiji) all share the impetus to disclose the past as a portal into the present, thereby dismpting normative time, and by implication, a fixed sense of history. However; the most striking similarity between these writers, despite their geographical and social distance, is their literary method which centres on the theory of coolitude. Coolitude was coined by Khal Torabully as a means of recuperating the voiceless coolie, firstly, by re-membering the sea voyage across the kizla pani and secondly, by highlighting the coolie's place in the mosaic of multicultural societies. Chapter 1 details the historical, theoretical and methodical foundations of the thesis. Chapter 2 explores Dabydeen's novels The Counting House and Our Lady of Demerara while Chapter 3 is a detailed study of Maniam's novels The Return and In A Far Country. The final chapter considers Nandan's novel The Wounded Sea and collection of poetry Lines Across Black Waters. Each literary analysis seeks to understand how coolitude, as a means to historically and politically place the coolie in the current world,: links spaces between countries both through a shared colonial history and a common postcolonial condition
Batched Second-Order Adjoint Sensitivity for Reduced Space Methods
No full textThis paper presents an efficient method for extracting the second-order
sensitivities from a system of implicit nonlinear equations on upcoming
graphical processing units (GPU) dominated computer systems. We design a custom
automatic differentiation (AutoDiff) backend that targets highly parallel
architectures by extracting the second-order information in batch. When the
nonlinear equations are associated to a reduced space optimization problem, we
leverage the parallel reverse-mode accumulation in a batched adjoint-adjoint
algorithm to compute efficiently the reduced Hessian of the problem. We apply
the method to extract the reduced Hessian associated to the balance equations
of a power network, and show on the largest instances that a parallel GPU
implementation is 30 times faster than a sequential CPU reference based on
UMFPACK.Comment: SIAM-PP2
JuliaGPU/AMDGPU.jl: v0.2.8
No full textAMDGPU v0.2.8
Diff since v0.2.7
Merged pull requests:
fixes for delayed codegeneration (#124) (@vchuravy)
Support GPUCompiler 0.12 (#145) (@vchuravy
Performance Investigation of Active, Semi-Active and Passive Suspension Using Quarter Car Model
No full textIn this paper, a semi-active and fully active suspension system using a PID controller were designed and tuned in MATLAB/Simulink to achieve simultaneous optimisation of comfort and road holding ability. This was performed in order to quantify and observe the trends of both the semi-active and active suspension, which can then influence the choice of controlled suspension systems used for different applications. The response of the controlled suspensions was compared to a traditional passive setup in terms of the sprung mass displacement and acceleration, tyre deflection, and suspension working space for three different road profile inputs. It was found that across all road profiles, the usage of a semi-active or fully active suspension system offered notable improvements over a passive suspension in terms of comfort and road-holding ability. Specifically, the rms sprung mass displacement was reduced by a maximum of 44% and 56% over the passive suspension when using the semi-active and fully active suspension, respectively. Notably, in terms of sprung mass acceleration, the semi-active suspension offered better performance with a 65% reduction in the passive rms sprung mass acceleration compared to a 40% reduction for the fully active suspension. The tyre deflection of the passive suspension was also reduced by a maximum of 6% when using either the semi-active or fully active suspension. Furthermore, both the semi-active and fully active suspensions increased the suspension working space by 17% and 9%, respectively, over the passive suspension system, which represents a decreased level of performance. In summary, the choice between a semi-active or fully active suspension should be carefully considered based on the level of ride comfort and handling performance that is needed and the suspension working space that is available in the particular application. However, the results of this paper show that the performance gap between the semi-active and fully active suspension is quite small, and the semi-active suspension is mostly able to match and sometimes outperform the fully active suspension n in certain metrics. When considering other factors, such as weight, power requirements, and complexity, the semi-active suspension represents a better choice over the fully active suspension, in the author’s opinion. As such, future work will look at utilising more robust control methods and tuning procedures that may further improve the performance of the semi-active suspension
Questioning modern time with Hannah Arendt and Walter Benjamin
No full textFour texts from Arendt and Benjamin are the scene of our thinking. We enact the question of time as a refusal to abide by the modern conception of time, where the present is the only ground of the real. We argue for a notion of time, in which all that-has-been is considered a site of real experience.
Firstly we discuss Arendt's book On Revolution. Through issues such as history, the eventful and revolt we show the usefulness of the question of time to further our understanding. Secondly in Arendt's 'What is Freedom', freedom is discussed beyond the private individual, as a matter of plurality, of living together. The question of time shows freedom grounded beyond the individual's present, in the historical time of plurality.
With Benjamin's essay 'On some motifs in Baudelaire' we show poetry as a challenge to the symbolic environment of the commodity world. Poetry appears as a keeper of our relation to the time of memory and language that precedes us. In Benjamin's 'The Work of Art in the Age of Its Technological Reproducibility', we distinguish art from technology through the question of time. Art's experience
involves an active relation with what-has-been, with past generations; it challenges the technological way of relating to the world that destroys the depth of human expenence.
Finally, Arendt and Benjamin are presented together, stressing their use of history and tradition to address the problems of modernity. Their effort to think the eventful is related to their negation of historical progression. From the question of time, their thinking teaches us a form of critique that denies the preconception of presence as being the totality of the real. Under their gaze presence is revealed as a changing surface under the sway of history, of time
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