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Multithreading, Blocking IO and Async IO

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Directi Group
Directi Group

Multithreading, blocking I/O, and asynchronous I/O are discussed. Blocking I/O causes CPUs to be idle waiting for I/O to complete. Multithreading and asynchronous non-blocking I/O allow the CPU to switch between threads/processes while waiting for I/O, improving CPU utilization. Asynchronous I/O removes the need for threads by notifying the CPU when I/O is complete, but multiple threads may still be useful when multiple CPUs are present to improve parallelism. Examples show how asynchronous I/O has enabled high concurrency web servers with tens of thousands of simultaneous connections.

TechnologySpiritual
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Multithreading, Blocking IO and Async IO By Bhavin Turakhia CEO, Directi [email_address]
Agenda ,[object Object],[object Object],[object Object],[object Object]
Introduction ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Analogy = Task = Process = CPU GOD
Scenario 1 – Computational Task ,[object Object],[object Object],[object Object],[object Object],[object Object],GOD
[object Object],Rule 1 – We always want to keep the CPU Busy
[object Object]
Scenario 2 – Same Task – Multi-Process ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],GOD
[object Object],Rule 2 – We want to keep the CPU Busy doing important stuff. Switching between processes is not the best utilization of the CPUs time
[object Object],GOD
Scenario 2 - IO ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],GOD
[object Object]
[object Object]
Scenario 3 – Multiple Processes ,[object Object],[object Object],[object Object],[object Object],GOD
[object Object],Rule 3 – If a process is waiting for IO, the CPU can switch its attention to another Process (context switching)
[object Object]
Scenario 4 – Multi-threading ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],GOD
[object Object],Rule 4 – The CPU can switch between threads, faster than switching between processes
[object Object],Threads vs Processes
Is there a scenario where I would want to use processes instead of threads anyways?
Scenario 5 – Async IO ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],GOD
Scenario 5 – Async Blocking IO ,[object Object]
Advantages of Async Non-blocking IO ,[object Object]
Is there a scenario where I would want multiple threads even if I use Async I/O ??
Scenario 6 – More than 1 GOD ,[object Object],[object Object],[object Object],[object Object],GOD GOD
Async IO Success Story ,[object Object],[object Object]
http://www.directi.com | http://careers.directi.com Questions? Email me: [email_address] Follow me: http://twitter.com/bhavintu Facebook: http://www.facebook.com/bhavin.t Blog: http://bhavin.directi.com Website: http://directi.com Download Slides: http://wiki.directi.com

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Multithreading, Blocking IO and Async IO

  • 1. Multithreading, Blocking IO and Async IO By Bhavin Turakhia CEO, Directi [email_address]
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  • 4. Analogy = Task = Process = CPU GOD
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  • 20. Is there a scenario where I would want to use processes instead of threads anyways?
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  • 24. Is there a scenario where I would want multiple threads even if I use Async I/O ??
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  • 27. http://www.directi.com | http://careers.directi.com Questions? Email me: [email_address] Follow me: http://twitter.com/bhavintu Facebook: http://www.facebook.com/bhavin.t Blog: http://bhavin.directi.com Website: http://directi.com Download Slides: http://wiki.directi.com