시간에 crontab을 실행할 수없는 이유

Question

안녕하세요, crontab이 제 시간에 실행할 수없는 이유를 알고 계신 분 있습니다. 그것은 적어도 10 초 지연되었습니다. 그것은 aws EC2 인스턴스입니다.

shell>uname -a  
shell>Linux srv-796-db1 3.14.20-20.44.amzn1.x86_64 #1 SMP Mon Oct 6 22:52:46 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux #Server Info 


awk '{split($3,a,":"); if (a[3] > 10) {print;}}' /var/log/cron | head -50 
Jan 11 22:30:13 srv-796-db1 CROND[12017]: (root) CMD (sleep 20; /usr/bin/php -f #different php script here >/dev/null 2>&1) 
Jan 11 22:30:13 srv-796-db1 CROND[12019]: (root) CMD (sleep 10; /usr/bin/php -f #different php script here >/dev/null 2>&1) 
Jan 11 22:30:13 srv-796-db1 CROND[12021]: (root) CMD (/usr/bin/php -f #different php script here >/dev/null 2>&1) 
Jan 11 22:30:13 srv-796-db1 CROND[12024]: (root) CMD (/usr/bin/php -f #different php script here >/dev/null 2>&1) 
Jan 11 22:30:13 srv-796-db1 CROND[12026]: (root) CMD (/usr/bin/php -f #different php script here >/dev/null 2>&1) 
Jan 11 22:30:13 srv-796-db1 CROND[12030]: (root) CMD (sleep 40; /usr/bin/php -f #different php script here >/dev/null 2>&1) 
Jan 11 22:30:13 srv-796-db1 CROND[12032]: (root) CMD (sleep 30; /usr/bin/php -f #different php script here >/dev/null 2>&1) 
Jan 11 22:30:13 srv-796-db1 CROND[12034]: (root) CMD (/usr/bin/php -f #different php script here >/dev/null 2>&1) 
Jan 11 22:30:13 srv-796-db1 CROND[12037]: (root) CMD (/usr/bin/php -f #different php script here >/dev/null 2>&1) 
Jan 11 22:30:13 srv-796-db1 CROND[12041]: (root) CMD (sleep 20; /usr/bin/php -f #different php script here >/dev/null 2>&1) 
Jan 11 22:30:13 srv-796-db1 CROND[12045]: (root) CMD (/usr/bin/php -f #different php script here >/dev/null 2>&1) 
Jan 11 22:30:14 srv-796-db1 CROND[12048]: (root) CMD (/usr/bin/php -f #different php script here >/dev/null 2>&1) 
Jan 11 22:30:14 srv-796-db1 CROND[12052]: (root) CMD (/usr/lib64/sa/sa1 1 1) 
Jan 11 22:40:11 srv-796-db1 CROND[18845]: (root) CMD (/usr/bin/php -f #different php script here >/dev/null 2>&1) 
Jan 11 22:40:11 srv-796-db1 CROND[18848]: (root) CMD (/usr/bin/php -f #different php script here >/dev/null 2>&1) 
Jan 11 22:40:11 srv-796-db1 CROND[18849]: (root) CMD (/usr/bin/php -f #different php script here >/dev/null 2>&1) 
Jan 11 22:40:11 srv-796-db1 CROND[18854]: (root) CMD (/usr/lib64/sa/sa1 1 1) 
Jan 11 22:40:11 srv-796-db1 CROND[18855]: (root) CMD (/usr/bin/php -f #different php script here >/dev/null 2>&1) 
Jan 11 22:40:11 srv-796-db1 CROND[18858]: (root) CMD (/usr/bin/php -f #different php script here >/dev/null 2>&1) 

어떤 아이디어 ???

Answer 1

그냥이 질문을 닫으려면 .. Cronjob은 일정에 따라 작업이 정확하게 실행된다는 것을 보장하지 않습니다. 그러나 작업을 시작하기 전에 마지막 작업 상태를 확인합니다. 마지막 작업이 완료되지 않은 경우 프로세스가 지연됩니다. "파일 제한 열기", "시간 초과"등과 같은 여러 요소 ...