(內容來自書本《mysql技術內幕innodb儲存引擎》)
如果需要監控cpu的使用情況,可以通重載入/proc/stat來完成。首先需要建立一張監控cpu的表cpu_stat:
create table if not exists cpu_stat
(id bigint auto_increment primary key,
value char(25) not null,
user bigint,
nice bigint,
system bigint,
idle bigint,
iowait bigint,
irq bigint,
softirq bigint,
steal bigint,
guest bigint,
other bigint,
time datetime
);接著可以通過load data infile命令來載入/proc/stat檔案,但需要對其中一些數值進行轉化,命令如下所示:
load data infile '/proc/stat' ignore into table cpu_stat fields terminated by ' '
(@value, @val1, @val2, @val3, @val4, @val5, @val6, @val7, @val8, @val9, @val10)
setvalue = @value,
user = if(@value not like 'cpu%', null, if(@value != 'cpu', ifnull(@val1, 0), ifnull(@val2, 0))),
nice = if(@value not like 'cpu%', null, if(@value != 'cpu', ifnull(@val2, 0), ifnull(@val3, 0))),
system = if(@value not like 'cpu%', null, if(@value != 'cpu', ifnull(@val3, 0), ifnull(@val4, 0))),
idle = if(@value not like 'cpu%', null, if(@value != 'cpu', ifnull(@val4, 0), ifnull(@val5, 0))),
iowait = if(@value not like 'cpu%', null, if(@value != 'cpu', ifnull(@val5, 0), ifnull(@val6, 0))),
irq = if(@value not like 'cpu%', null, if(@value != 'cpu', ifnull(@val6, 0), ifnull(@val7, 0))),
softirq = if(@value not like 'cpu%', null, if(@value != 'cpu', ifnull(@val7, 0), ifnull(@val8, 0))),
steal = if(@value not like 'cpu%', null, if(@value != 'cpu', ifnull(@val8, 0), ifnull(@val9, 0))),
guest = if(@value not like 'cpu%', null, if(@value != 'cpu', ifnull(@val9, 0), ifnull(@val10, 0))),
other = if(@value not like 'cpu%', user + nice + system + idle + iowait + irq + softirq + steal + guest, @val1),
time = now();
接著可以設定乙個定時器來讓mysql資料庫自動地執行上述load data infile語句,這樣就會有每個時間點的cpu資訊被記錄到表cpu_stat。執行下述語句就可以得到每個時間點上cpu的使用情況。
select
100 * ((new.user - old.user)/(new.other - old.other)) user,
100 * ((new.nice - old.nice)/(new.other - old.other)) nice,
100 * ((new.system - old.system)/(new.other - old.other)) system,
100 * ((new.idle - old.idle)/(new.other - old.other)) idle,
100 * ((new.iowait - old.iowait)/(new.other - old.other)) iowait,
100 * ((new.irq - old.irq)/(new.other - old.other)) irq,
100 * ((new.softirq - old.softirq)/(new.other - old.other)) softirq,
100 * ((new.steal - old.steal)/(new.other - old.other)) steal,
100 * ((new.guest - old.guest)/(new.other - old.other)) guest,
new.time
from cpu_stat old, cpu_stat new
where new.id - 15 = old.id
and old.value = 'cpu'
and new.value = old.value;
同樣,還可以對/proc/diskstat檔案執行如上所示的操作,這樣就可以對磁碟進行監控操作了。
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