This book constitutes the proceedings of the 18th IFIP WG 10.3 International Conference on Network and Parallel Computing, NPC 2021, which was held in Paris, France during November 3-5, 2021.The 20 papers presented in this volume were carefully reviewed and selected from 62 submissions. and networks and communications.

Algorithms and Applications.- High Resolution of City-Level Climate Simulation by GPU with Multi-Physical Phenomena.- dgQuEST: Distributed-GPU Accelerated Large Scale Quantum Circuit Simulation.- vSketchDLC: A Sketch on Distributed Deep Learning Communication via Fine-grained Tracing Visualization.- Scalable Algorithms Using Sparse Storage for Parallel Spectral Clustering on GPU.- XSP: Fast SSSP Based on Communication-Computation Collaboration.- A Class Of Fast And Accurate Multi-layer Block Summation And Dot Product Algorithms.- A KNN Query Method for Autonomous Driving Sensor Data.- System Software and Resource Management.- A Novel Task-Allocation Framework based on Decision-Tree Classification Algorithm in MEC.- QoS-Aware Scheduling for Cellular Networks Using Deep Reinforcement Learning.- Adaptive Buffering Scheme for PCM/DRAM-Based Hybrid Memory Architecture.- Efficiency-First Fault-Tolerant Replica Scheduling Strategy for Reliability Constrained Cloud Application.- Towards an Optimized Containerization of HPC Job Schedulers based on Namespaces.- Architecture of an On-time Data Transfer Framework in Cooperation with Scheduler System.- Storage.- Data Delta Based Hybrid Writes for Erasure-Coded Storage Systems.- BDCuckoo: An Efficient Cuckoo Hash for BlockDevice.- A Two Tier Hybrid Metadata Management mechanism for NVM Storage System.- A Novel CFLRU-based Cache Management Approach for NAND-based SSDs.- Networks and Communications.- Taming Congestion and Latency in Low-Diameter High-Performance Datacenters.- Evaluation of Topology-Aware All-reduce Algorithm for Dragon y Networks.- MPICC: Multi-Path INT-based Congestion Control in Datacenter Networks. 

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