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What does 'TID' mean in iotop?

Total DISK READ: 0.00 B/s | Total DISK WRITE: 3.90 M/s
  TID  PRIO  USER     DISK READ  DISK WRITE  SWAPIN     IO>    COMMAND
 2150 be/4 root        0.00 B/s    0.00 B/s  0.00 % 65.25 % [flush-202:0]
 6694 be/4 www-data    0.00 B/s   19.64 K/s  0.00 %  0.00 % php-fpm: pool www
 6700 be/4 www-data    0.00 B/s   23.56 K/s  0.00 %  0.00 % php-fpm: pool www
 8646 be/4 www-data    0.00 B/s  424.12 K/s  0.00 %  0.00 % php-fpm: pool www
10974 be/4 www-data    0.00 B/s   19.64 K/s  0.00 %  0.00 % php-fpm: pool www

thanks.

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up vote 3 down vote accepted

TID stands for Thread ID, which for most purposes, you can think of as equivalent to the standard linux Process ID.

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