Uploaded image for project: 'MariaDB Server'
  1. MariaDB Server
  2. MDEV-7960

Field::char_length() takes 0.15% in OLTP RO

        Details

        • Type: Bug
        • Status: Open
        • Priority: Minor
        • Resolution: Unresolved
        • Affects Version/s: 10.1
        • Fix Version/s: 10.1
        • Component/s: None
        • Labels:
          None

          Description

          Data comes from Sandy Bridge system running sysbench OLTP RO in 1 thread against 1 table.

          Call graphs:

          -   0.15%  mysqld  mysqld
   - Field::char_length()
      + 73.43% Field_string::sort_string(unsigned char*, unsigned int)
      + 16.71% Item_field::set_field(Field*)
      + 4.95% make_sortkey(Sort_param*, unsigned char*, unsigned char*)
      + 4.91% Item_field::fix_fields(THD*, Item**)

          This is virtual method which can't be inlined. Most time spent for function call convention. Check if we can revoke it's virtual status.

          NB: Field::charset() which is used by this method is virtual too.

            Gliffy Diagrams

              Attachments

                Activity

                There are no comments yet on this issue.

                  People

                  • Assignee:
                    bar Alexander Barkov
                    Reporter:
                    svoj Sergey Vojtovich
                  • Votes:
                    0 Vote for this issue
                    Watchers:
                    2 Start watching this issue

                    Dates

                    • Created:
                      Updated: