https://bugs.kde.org/show_bug.cgi?id=428073
Bug ID: 428073
Summary: KIO filesystem actions are very slow for small files
Product: frameworks-kio
Version: unspecified
Platform: Debian unstable
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: kio-bugs-n...@kde.org
Reporter: bug....@petzel.at
CC: kdelibs-b...@kde.org
Target Milestone: ---
Created attachment 132618
--> https://bugs.kde.org/attachment.cgi?id=132618&action=edit
IO using cp and kcp
Copying files over KIO is significantly slower than native filesystem actions
when performing on many small files.
I did a test with 40000 files of 50K for
a) On a tmpfs cp took about a second, kcp took about 6 seconds. I guess this is
a good measure of the cpu overhead of KIO copy.
b) On a hard drive cp took about 53 seconds, kcp took about 3m41s. Now this is
a very significant difference.
I monitored the process in KSysGuard, and I found that copying over KIO leads
to much less reading operations per second and a much lower reading speed, as
you can see from the attached screenshots. (kcp reads data at about 1/10 of the
rate of cp!)
I guess one possible reason for this could be an artificial limit to read ops
to prevent system freezes on copy operations?
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