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Data comes from Sandy Bridge system running sysbench OLTP RO in 1 thread against 1 table.
Call graphs:
- 0.37% mysqld libc-2.15.so
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- __strcmp_sse42
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+ 43.10% Protocol::store_string_aux(char const*, unsigned long, charset_info_st const*, charset_info_st const*)
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+ 27.26% ha_innobase::change_active_index(unsigned int)
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+ 20.46% open_table(THD*, TABLE_LIST*, Open_table_context*)
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+ 7.66% ha_innobase::records_in_range(unsigned int, st_key_range*, st_key_range*)
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+ 1.52% Item::set_name(char const*, unsigned int, charset_info_st const*)
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Protocol::store_string_aux() calls my_charset_same(), which does strcmp(). This can be optimized out.
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