使用mysqldump导入数据后，为什么写入的块大小固定？

Question

When I am using mysqldump to import data, I exec pidstat -p ${pid of mysqld} -d 2 . Then I saw that after executing mysqldump, there are still fixed-size blocks written. I think it is amazing. Why is this phenomenon?

Answer 1

A guess: Writes are buffered through the buffer_pool. After the busy part ended, the buffer_pool was mostly full and 'dirty'. After that, a background task flushed the blocks at its leisure, apparently at a rate of about 6MB/s