这是有关于使用linux下的定时器的实验，通过下载到实验板上，可以观察到linux下统计进程执行时间。-This is under linux timer on the use of experiments to test the board by downloading, can be observed under linux statistical process execution time.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001288s ]
SELECT `a`.`aid`,`a`.`title`,`a`.`create_time`,`m`.`username` FROM `jrk_downrecords` `a` INNER JOIN `jrk_member` `m` ON `a`.`uid`=`m`.`id` WHERE `a`.`status` = 1 GROUP BY `a`.`aid` ORDER BY `a`.`create_time` DESC LIMIT 10 [ RunTime:0.087357s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001226s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001898s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001230s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003601s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001054s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003203s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.014468s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001336s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 305703 [ RunTime:0.001336s ]
