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keeping simple

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Category: systems

The replicated state machine method of fault tolerance from 1980s

August 26, 2016 vy auragen, business, operating systems, systems

The first time I saw this method was when I went to work for Parallel Computer Systems, , later called Auragen, in the famous tech startup

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circularity problems in distributed consensus

August 25, 2016 vy academics, archived, systems, theory

Distributed consensus involves organizing a collection of independent agents – processes or network sites – to agree on some value or sequence of values.  Many

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RTLinux

June 10, 2016 vy rtlinux, systems

Some old stuff I found in the office

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IEEE 1588 PTP is a mess

April 27, 2016 vy systems, timekeeper

IEEE 1588 was not designed for modern enterprise computer networks and contains many hacks to make it sort of work. The standard also suffers from

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The difference between unspecified, undefined, and non-deterministic

February 20, 2016 vy academics, systems

There is too much confusion in the “formal methods” computer science literature between these three different terms. Let me start with what this means for

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Software quality at toyota

February 16, 2016 vy systems

The good stuff starts on page 36 Koopman.   

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one way queues

February 6, 2016 vy systems

Here’s some code for lock free queues for a single producer and single consumer. The code is designed for Intel multiprocessors with strong memory model.

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The Auragen file system.

January 25, 2016 vy auragen, operating systems, systems

This article on the interesting Wave Transactional File System inspired me to look up an earlier file system that also used copy on write semantics.

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Paxos and other consensus algorithms and the unaccountable love for asynchrony

January 24, 2016 vy systems

I’ve been looking at Paxos and Raft and Zab and other algorithms that can loosely be called “consensus” algorithms because we want to see where we can

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More on Fischer, Lynch, Patterson and the parrot theorem.

January 14, 2016 vy academics, systems

I’m thinking about distributed consensus algorithms, timestamping, and databases and if you read that literature you will see many references to the Fischer, Lynch, Paterson

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