performance

| | |

The Role of DEX Aggregators and Routers in Decentralized Trading

ByEric Ma

In the decentralized finance (DeFi) ecosystem, decentralized exchanges (DEXs) enable users to trade cryptocurrencies without intermediaries. However, with the growing number of DEXs offering varying levels of liquidity, fees, and trading pairs, navigating this landscape efficiently can be challenging. DEX aggregators and routers are tools designed to optimize trading, but they serve different purposes. This…

|

Understanding Temporary Forks and Reorganization in Blockchain

ByEric Ma

Temporary forks and chain reorganizations (reorgs) are natural occurrences in decentralized blockchain systems. They arise due to the asynchronous nature of block propagation across the network. While temporary forks are short-lived and resolved quickly, chain reorganization refers to the process by which the blockchain discards one branch in favor of a longer or higher-priority chain….

| |

Linear Consistency Model for Computer Systems

ByEric Ma

Linear consistency models are crucial in ensuring reliability and coherence in distributed computer systems. These models help manage how systems handle data and operations across multiple nodes, ensuring consistency without sacrificing performance. What is a Linear Consistency Model? In distributed computing, a linear consistency model ensures that operations on distributed data appear as if they…

| |

Understanding Cloud Storage Consistency Models

ByEric Ma

Cloud storage systems utilize various consistency models to balance performance, availability, and data accuracy. This article explores these models, their trade-offs, and examples of systems using them. We’ll also discuss the CAP theorem and its implications. Consistency Models Strong Consistency Definition: Guarantees that any read operation returns the most recent write for a given piece…

| | |

Comparing Paxos and Raft

ByEric Ma

Paxos and Raft are both consensus algorithms used to ensure consistency in distributed systems. While they solve similar problems, they have different approaches and design philosophies. Characteristics Paxos Roles: Proposers, Acceptors, Learners. Phases: Two main phases (Prepare/Promise and Propose/Accept). Leader Election: Not explicitly defined, often implemented using Multi-Paxos to handle multiple proposals efficiently. Use Cases:…

| | |

Understanding the Paxos Consensus Algorithm

ByEric Ma

The Paxos consensus algorithm is a fundamental concept in distributed computing that ensures a group of distributed systems can agree on a single value, even in the presence of failures. Developed by Leslie Lamport, Paxos is widely used in systems where consistency and fault tolerance are critical, such as databases and distributed ledgers. Consensus Problem…

| |

Installing Zlib in Ubuntu 22.04

ByEthan Ainsworth

Zlib is a popular open-source compression library used by many software applications to compress and decompress data. It provides fast and efficient compression and decompression algorithms that can be used to reduce the size of data, which can improve performance and reduce storage requirements. In this post, we will discuss how to install zlib in…

|

Why std::vector is the Optimal Choice for Data Structures for Performance in C++

ByEthan Ainsworth

In C++ programming, data structures are essential for organizing and manipulating data. When it comes to storing and manipulating data, one data structure stands out above the rest – the std::vector. Efficient Memory Allocation One of the primary benefits of std::vector is its efficient memory allocation. std::vector uses contiguous memory allocation, which means that the…

|

Linux Kernel 4.19.70 Release

ByTony

This post summarizes new features, bugfixes and changes in Linux kernel release 4.19.70. Linux 4.19.70 Release contains 95 changes, patches or new features. In total, there are 101,521 lines of Linux source code changed/added in Linux 4.19.70 release compared to Linux 4.19 release. To view the source code of Linux 4.19.70 kernel release online, please…

| |

Add Inline Comments for Multi-line Command in Bash Script

ByEric Ma

In Bash script, it is common that multiple small commands run together connected by pipes (|) and the whole command is quite long. For clarity, we may write the command in multiple lines. How to add comments for these long multi-line commands? In Bash, the content after # in a line is the comment. Using…

|

How to Install Hyperledger Fabric 2.0 in Ubuntu 18.04

ByEric Ma

Hyperledger Fabric is a consortium blockchain system. It’s performance is relatively good and its modular architecture enables it to be usable in many scenarios. Hyperledger Fabric itself has rich documents and samples of test networks. For beginners, deploying a new network for trying and testing still consumes quite some time. In this post, we will…

What is the difference between work conserving I/O scheduler and non-work conserving I/O scheduler?

ByWeiwei Jia

What is the difference between work conserving I/O scheduler and non-work conserving I/O scheduler? In a work-conserving mode, the scheduler must choose one of the pending requests, if any, to dispatch, even if the pending requests are far away from the current disk head position. The rationale for non-work-conserving schedulers, such as the anticipatory scheduler…

How to tune systems to achieve high performance in virtualization circumstances?

ByWeiwei Jia

Most time, we need to tune system parameters to achieve better performance but what the general parameters to be tuned in Linux systems. I think you may want to add following parameters to Kernel boot (/etc/default/grub) parameters intel_idle.max_cstate=0 processor.max_cstate=0 idle=poll intel_pstate=disable At the same time, you may also want to shutdown/open Pause Loop Exiting (PLE)….