KIO: Mass Copy of Files from Different Sources to Different Destinations

David Faure faure at
Wed Aug 19 16:12:12 BST 2009

On Thursday 18 June 2009, Alejandro Wainzinger wrote:
> Using KIO::copy( ... ) to generate more than 150 jobs causes the KIO
> scheduler to complain:
> "WARNING - KIO::Scheduler got more than 150 jobs! This shows a misuse
> in your app (yes, a job is a QObject)."
> What misuse is this, isn't the KIO::Scheduler supposed to schedule
> jobs?  I notice that you can directly tell the scheduler to schedule a
> job with KIO::Scheduler::scheduleJob(...) which will queue jobs when
> no slaves are left over and possibly avoid this error, but that only
> works for SimpleJobs, and a CopyJob is not a SimpleJob.
> Up until now I've worked around it by manually keeping track of jobs I
> create and jobs that finish so as not to make the Scheduler angry, but
> shouldn't this be part of the Scheduler's job?
> I notice most applications don't run into this issue because they use
> KIO to copy a folder that could contain more than 150 files which is
> fine, or copy more than 150 files to a single destination, but in my
> case each file I copy can come from a different source and go to a
> different destination so I can not aggregate the jobs.

This could be another reason for "all jobs should be scheduled",
as we were discussing in another thread ("Patch KIO::AccessManager").

I just gave it a try, as an experiment. Shows that scheduleJob has to support
being called twice for a job, but apart from that, the unittest "jobtest" 
still passes, which is good enough for me :-)

Can you give the attached patch a try?

David Faure, faure at, sponsored by Qt Software @ Nokia to work on KDE,
Konqueror (, and KOffice (
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