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  1. MariaDB Server
  2. MDEV-7960

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

Details

    • Bug
    • Status: Open (View Workflow)
    • Minor
    • Resolution: Unresolved
    • 10.1(EOL)
    • 10.2(EOL)
    • None
    • 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.

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            bar Alexander Barkov
            svoj Sergey Vojtovich
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            Dates

              Created:
              Updated:

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