void master_thread()

{

int innodb_io_capacity = 200 ；//表示磁盤IO吞吐量

int innodb_max_dirty_pages_pct = 75 ；//最大臟頁百分比

goto loop;

loop:

//1秒循環

for(int i = o; i<10; i++)

{

thread_sleep(1);//innodb 優化，壓力大時不總是等待1秒

//日志緩沖刷新到磁盤

do log buffer flush to disk;

//如果磁盤壓力小，合并插入緩沖

if ( last_one_second_ios < innodb_io_capacity*5% ?)

{

do merge at most innodb_io_capacity*5% insert buffer;

}

//判斷臟頁比例

if ( buf_get_modified_ratio_pct > innodb_max_dirty_pages_pct )

{

do buffer pool flush innodb_io_capacity*100% dirty page;

}

//如果開啟自適應刷新，通過判斷產生重做日志的速度來判斷合適的刷新臟頁數量

else if enable adaptive flush

{

do buffer pool flush desired amount dirty page;

}

//如果無用戶活動，切換到 backgroud loop

if ( no user activity )

{

goto backgroud loop;

}

}

//10秒循環

//如果磁盤壓力小，刷新innodb_io_capacity*100%的臟頁到磁盤

if ( last_ten_second_ios < innodb_io_capacity )

{

do buffer pool flush innodb_io_capacity*100% dirty page;

}

//合并插入緩沖

do merge at most innodb_io_capacity*5% insert buffer;

//日志緩沖刷新到磁盤

do log buffer flush to disk;

//刪除無用undo頁，每次最多刪除20個undo頁

do full purge;

//判斷臟頁比例

if ( buf_get_modified_ratio_pct >70% )//---------

{

do buffer pool flush innodb_io_capacity*100% dirty page;

}

else

{

do buffer pool flush innodb_io_capacity*10% dirty page;

}

//產生一個模糊檢查點，只是將最老日志序列號的頁寫入磁盤

do fuzzy checkpoint;

goto loop;

//backgroud

backgroud loop:

//刪除無用undo頁

do full purge;

//合并插入緩沖

do merge innodb_io_capacity*100% insert buffer;

//不空閑跳回主循環，空閑則進入flush loop

if not idle

{

goto loop;

}

else

{

goto flush loop;

}

//flush loop

flush loop:

//不斷刷新臟頁到磁盤，直到臟頁比例小于innodb_max_dirty_pages_pct，則進入suspend loop

do buffer pool flush innodb_io_capacity*100% dirty page;

while ( buf_get_modified_ratio_pct > innodb_max_dirty_pages_pct );

goto suspend loop;

//suspend loop

suspend loop:

suspend_thread();

waiting event;

goto loop;

}

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