Welcome to Operating Systems: Three Easy Pieces (now version 1.10 -- see book news for details), a free online operating systems book! The book is centered around three conceptual pieces that are fundamental to operating systems: virtualization, concurrency, and persistence. In understanding the conceptual, you will also learn the practical, including how an operating system does things like schedule the CPU, manage memory, and store files persistently. Lots of fun stuff! Or maybe not so fun?
This book is and will always be free in PDF form, as seen below. For those of you wishing to BUY a copy, please consider the following:
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Warning: Some resellers on Amazon buy old versions of the books and claim to sell them as “new” on Amazon (click here for an example); buy from them at your own risk. In general, buy either directly from Lulu.com or Amazon.com (not a reseller). For Amazon, go to this page and look for Seller Information to be Amazon.com.
Merch: Can't bear to go out in public without OSTEP? How about an Operating Systems: Three Easy Pieces T-shirt or laptop sticker or bathmat or blanket or mug or check out the whole store?
Donate: By popular demand, another way to support this site and its contents: donate! Click to donate $1 - $10 - $20 - $50 - or click here to donate any amount you want! Your donation helps keep this book going. Think about it: if everyone who came to this website donated just one dollar, we'd have at least three dollars. Thanks!
Another way to help the book out: cite it! Here is the BiBTeX entry (seen below); you can also link to the site of the best free operating systems book on the market.
Operating Systems: Three Easy Pieces
Remzi H. Arpaci-Dusseau and Andrea C. Arpaci-Dusseau
Arpaci-Dusseau Books
November, 2023 (Version 1.10)
And now, the free online form of the book, in chapter-by-chapter form (now with chapter numbers!):