Details
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Task
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Status: In Review (View Workflow)
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Critical
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Resolution: Unresolved
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None
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None
Description
Multi-threaded Linux programs (like Firefox or MySQL since 8.0.27 or so) usually set a name for each thread. This name will appear in the output of top and other utilities and would help to answer questions like "What thread uses most of CPU" etc.
Consider this example of MySQL 8.0.29:
openxs@ao756:~/dbs/8.0$ for task in $(ls /proc/$(pidof mysqld)/task/); do name=$(cat /proc/$(pidof mysqld)/task/${task}/comm); echo "TASK: ${task} (${name})"; done
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TASK: 567049 (mysqld)
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TASK: 567079 (ib_io_ibuf)
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TASK: 567080 (ib_io_log)
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TASK: 567081 (ib_io_rd-1)
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TASK: 567082 (ib_io_rd-2)
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TASK: 567083 (ib_io_rd-3)
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TASK: 567084 (ib_io_rd-4)
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TASK: 567085 (ib_io_wr-1)
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TASK: 567086 (ib_io_wr-2)
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TASK: 567087 (ib_io_wr-3)
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TASK: 567088 (ib_io_wr-4)
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TASK: 567089 (ib_pg_flush_co)
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TASK: 567096 (ib_log_checkpt)
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TASK: 567097 (ib_log_fl_notif)
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TASK: 567098 (ib_log_flush)
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TASK: 567099 (ib_log_wr_notif)
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TASK: 567100 (ib_log_writer)
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TASK: 567114 (ib_srv_lock_to)
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TASK: 567115 (ib_srv_err_mon)
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TASK: 567116 (ib_srv_mon)
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TASK: 567117 (ib_buf_resize)
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TASK: 567118 (ib_src_main)
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TASK: 567119 (ib_dict_stats)
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TASK: 567120 (ib_fts_opt)
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TASK: 567122 (xpl_worker-1)
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TASK: 567123 (xpl_worker-2)
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TASK: 567124 (xpl_accept-1)
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TASK: 567893 (ib_buf_dump)
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TASK: 567894 (ib_clone_gtid)
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TASK: 567895 (ib_srv_purge)
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TASK: 567896 (ib_srv_wkr-1)
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TASK: 567897 (ib_srv_wkr-2)
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TASK: 567898 (ib_srv_wkr-3)
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TASK: 567899 (evt_sched)
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TASK: 567900 (sig_handler)
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TASK: 567902 (xpl_accept-3)
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TASK: 567903 (gtid_zip)
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For MariaDB (10.6 here for example) we get:
openxs@ao756:~/dbs/maria10.6$ for task in $(ls /proc/$(pidof mariadbd)/task/); do name=$(cat /proc/$(pidof mariadbd)/task/${task}/comm); echo "TASK: ${task} (${name})"; done
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TASK: 568093 (mariadbd)
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TASK: 568095 (mariadbd)
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TASK: 568096 (mariadbd)
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TASK: 568097 (mariadbd)
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TASK: 568098 (mariadbd)
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TASK: 568099 (mariadbd)
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TASK: 568104 (mariadbd)
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TASK: 568105 (mariadbd)
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openxs@ao756:~/dbs/maria10.6$
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See also https://bugs.mysql.com/bug.php?id=70858
It makes sense to use the same thread name as used in Performance Schema.