IBM Data and AI Ideas Portal for Customers


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Status Future consideration
Workspace Informix
Components Informix Server
Created by Guest
Created on Nov 2, 2021

RELATED IDEAS

Evaluate using io_uring for I/O in Informix Linux Platform

Create some performance tests and evaluate an architecture change in Informix to migrate AIO or Kernel AIO to using kernel io_uring

Maybe it's not possible to use io_uring in Informix and nowadays, performance increase from using IO_DIRECT KAIO to use io_uring could not be a clear benefit.

Some testings similar to database workload, show performance increase of just 5%, but in heavy loaded systems with lots of concurrent threads this can grow to 50%

For sure, everybody in Linux is migrating I/O workloads to io_uring, and there are specific changes in latests kernel versions to increase I/O performance and reduce bottlenecks using io_uring.

Just create an evaluation taskforce and determine if using io_uring in Informix (Linux platform) can get some advantages and become a disruptive performance boost or if it doesn't worth it

Spending some time to evaluate cannot be bad because:

  1. Linux is one of the more extended platforms using Informix

  2. Linux has implemented a new performant method to execute I/O operations in total asynchronous mode called io_uring

  3. As new storage is becoming faster, context switching is getting a bottleneck in I/O operations

  4. io_uring is already available in RHEL 8.4 + kernels and in all other linux with kernel 5.1 or greater

grep io_uring_setup /proc/kallsyms

For people not knowing what io_uring is. You can read some insights at:

https://thenewstack.io/how-io_uring-and-ebpf-will-revolutionize-programming-in-linux/


Also, two good technical documents describing how and why to use io_uring:

https://kernel.dk/io_uring.pdf
https://anarazel.de/talks/2020-05-28-pgcon-aio/2020-05-28-pgcon-aio.pdf
Needed By Not sure -- Just thought it was cool

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