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Paper Abstract and Keywords
Presentation 2025-11-04 10:40
Optimizing Parallelism for High-Speed File Transfers based on Transaction Latency
Rin Suzuki, Ryo Nakamura (UTokyo) IA2025-38
Abstract (in Japanese) (See Japanese page) 
(in English) Efficient transfer of large files is often achieved through multiple connections; however, the optimal number of connections varies depending on the network environments and host resources. Existing approaches typically employ a fixed adjustment interval (e.g., 3–5 seconds), which may delay convergence to peak throughput or cause instability. To overcome this limitation, we propose a novel method that dynamically determines the adjustment interval by monitoring transaction-level latency during Secure File Transfer Protocol (SFTP) operations. The proposed algorithm adaptively updates the number of connections based on observed latency and throughput gradients, enabling faster convergence to the peak throughput. Experimental evaluations in both local and long-distance environments (Tokyo–Singapore and Tokyo–Sydney, Microsoft Azure) demonstrate that our method significantly shortens the time to reach peak throughput compared with existing approaches. In particular, it achieved up to 2.2× faster transfer in the local environment and up to 1.5× faster performance in wide-area environments. These results confirm the effectiveness of latency-based adaptive connection control for accelerating large-scale file transfers across diverse environments.
Keyword (in Japanese) (See Japanese page) 
(in English) file transfer / parallelism optimization / transaction latency / sftp / ssh / / /  
Reference Info. IEICE Tech. Rep., vol. 125, no. 222, IA2025-38, pp. 15-21, Nov. 2025.
Paper # IA2025-38 
Date of Issue 2025-10-28 (IA) 
ISSN Online edition: ISSN 2432-6380
Copyright
and
reproduction		 All rights are reserved and no part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopy, recording, or any information storage and retrieval system, without permission in writing from the publisher. Notwithstanding, instructors are permitted to photocopy isolated articles for noncommercial classroom use without fee. (License No.: 10GA0019/12GB0052/13GB0056/17GB0034/18GB0034)
Download PDF IA2025-38

Conference Information
Committee IA  
Conference Date 2025-11-04 - 2025-11-04 
Place (in Japanese) (See Japanese page) 
Place (in English) Kantary Hills Hotel,Thailand 
Topics (in Japanese) (See Japanese page) 
Topics (in English) IA2025 - Workshop on Internet Architecture and Applications 2025 
Paper Information
Registration To IA 
Conference Code 2025-11-IA 
Language English (Japanese title is available) 
Title (in Japanese) (See Japanese page) 
Sub Title (in Japanese) (See Japanese page) 
Title (in English) Optimizing Parallelism for High-Speed File Transfers based on Transaction Latency 
Sub Title (in English)  
Keyword(1) file transfer  
Keyword(2) parallelism optimization  
Keyword(3) transaction latency  
Keyword(4) sftp  
Keyword(5) ssh  
Keyword(6)  
Keyword(7)  
Keyword(8)  
1st Author's Name Rin Suzuki  
1st Author's Affiliation The University of Tokyo (UTokyo)
2nd Author's Name Ryo Nakamura  
2nd Author's Affiliation The University of Tokyo (UTokyo)
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Speaker Author-1 
Date Time 2025-11-04 10:40:00 
Presentation Time 20 minutes 
Registration for IA 
Paper # IA2025-38 
Volume (vol) vol.125 
Number (no) no.222 
Page pp.15-21 
#Pages 7 
Date of Issue 2025-10-28 (IA) 

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