KDE Frameworks 5.53 Will Have An Important KIO Performance Fix
Written by Michael Larabel in KDE on 25 November 2018 at 11:21 AM EST. 20 Comments
KDE --
With KDE Frameworks 5.53 due out in December there is a significant performance fix in the KIO slaves code.

In this week's round-up of KDE usability and productivity work, there is a lot of bug fixing and other UI refinements going on... No standout features over the past week, but one of the fixes did catch my attention: improving the performance of KIO that is used by Dolphin and other KDE programs for dealing with I/O across various protocols/formats.

It turns out from the transition of the KDE 4 Software Compilation to KDE Frameworks 5, a build system mix-up caused for the kioslaves code to always be built without sendfile support. The SENDFILE system call as a reminder is about copying data between two file descriptors as a more efficient approach than using read() and write() due to the roundtrip to/from user-space needed with that traditional approach. While the SENDFILE system call has been widely supported on Linux for a long time, the build system issue led to the support not being enabled in the KDE Frameworks 5 code.

So the fix is in there now for KDE Frameworks 5.53 to re-enable this "massive optimization" for KIO.
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Michael Larabel is the principal author of Phoronix.com and founded the site in 2004 with a focus on enriching the Linux hardware experience. Michael has written more than 10,000 articles covering the state of Linux hardware support, Linux performance, graphics drivers, and other topics. Michael is also the lead developer of the Phoronix Test Suite, Phoromatic, and OpenBenchmarking.org automated benchmarking software. He can be followed via Twitter or contacted via MichaelLarabel.com.

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