number of cron jobs

[Shankar_6]

Hi,

Assume a script is scheduled through cron every 5mins and it is getting hung. In this case will cron waits for its completion to remove it from the job queue or it will just keep adding the jobs in the queue?

[Steven E. Protter · Accepted solution]

Shalom,

cron will keep running what it is told to run.

To avoid this the script being run can check ps output and self terminate.

SEP

[Roopesh Francis_1]

Shankar,

cron can run muliple jobs at same time so all the jobs will run as scheduled.

Thanks

[Pete Randall]

See the man page for queuedefs (4):

"All other queues can have up to 100 jobs running simultaneously. They will be run with a nice value of 2, and if a job cannot be run because too many other jobs are running, cron will wait 60 seconds before trying again to run it."


Pete

[Pete Randall]

>> "All other queues" refers to the queues other than at and batch - namely cron.


Pete

[Shankar_6]

Hi All,

thanks for all ur reply.

I am looking for only the number of jobs in the queue..Does cron waits for a script to finish so that it can reduce the count in the cron queue or it just submits the job and leave it irrespective whether it finishes or not..

[Pete Randall]

I repeat:

See the man page for queuedefs (4):

"All other queues (aside from at and batch) can have up to 100 jobs running simultaneously. They will be run with a nice value of 2, and if a job cannot be run because too many other jobs are running, cron will wait 60 seconds before trying again to run it."


Pete

[Shankar_6]

Hi Pete,

I understood the above reply..

to be simple - when the job started using cron,the queue size will be 1..will it be 1 until it completes or it just submits the job and make the queue size to 0..

[Shankar_6]

Hi Steven/Pete,

Any reply from ur end..

I want to know this because one of our server suddenly throwing messages "c queue message reached limit" ..I am sure nothing changed in crontab but could see more ftp sessions got hung..that's the reason i want to know will those jobs be in the queue till it completes or just clear the queue as log it is submitted..

[Dennis Handly]

>will it be 1 until it completes

Yes, it waits until it is done, the only important measure.