Uploaded image for project: 'Qt'
  1. Qt
  2. QTBUG-100292

Qt6's QSET very slow

XMLWordPrintable

    • Icon: Bug Bug
    • Resolution: Duplicate
    • Icon: Not Evaluated Not Evaluated
    • None
    • 6.2.2
    • Core: Other
    • None
    • Linux/X11

      This is the stacktrace:

      It takes ages when I try to do set difference with - operator, when sets have around 10000 items both. It spends ages in 1+2 functions of stacktrace.

      Same code works 100000x faster with Qt 5.

      1   QHashPrivate::Data<QHashPrivate::Node<QString, QHashDummyValue>>::erase    qhash.h                664 0x7ffff7797e35 
2   QHash<QString, QHashDummyValue>::remove                                    qhash.h                885 0x7ffff7797b54 
3   QSet<QString>::remove                                                      qset.h                 99  0x7ffff779753d 
4   QSet<QString>::subtract                                                    qset.h                 317 0x7ffff779737f 
5   QSet<QString>::operator-=                                                  qset.h                 226 0x7ffff778c8e1 
6   QSet<QString>::operator-                                                   qset.h                 235 0x7ffff7846a69

        No reviews matched the request. Check your Options in the drop-down menu of this sections header.

            thiago Thiago Macieira
            skunkos Martin Rotter
            Votes:
            0 Vote for this issue
            Watchers:
            2 Start watching this issue

              Created:
              Updated:
              Resolved:

                There are no open Gerrit changes