Re: how to refrain only use certain number of processors
On Mon, Jan 30, 2012 at 10:08 PM, Chen Wei <weichen302@gmx.com> wrote:
> On Mon, Jan 30, 2012 at 06:06:06PM +0800, lina wrote:
>> I have a script like
>>
>> #!/bin/bash
>> for i in {0..108}
>> do
>>
>> some job will run for mins &
>> done
>>
>> Here I used & for some kinda of parallel.
>> but there is a problem,
>> I wished at most it only run 8 jobs simultantly, no more than 8, once
>> finished, a new job can continue,
>> Some suggestions?
>
> how about instead of one script, running 8 scripts from cron, each has
> its own lock file:
>
> ------------------------------------
> #!/bin/sh
> #script no.1
>
> LOCKFILE="$HOME/lockfiles/lock_1"
> if [ -f $LOCKFILE ]; then
> exit 1
> else
> echo "green light .."
> fi
>
> date -u > $LOCKFILE
> do something
> rm $LOCKFILE
This is a very nice options. I can use
for i in {1..20}
do something
in script one,
and i in {21..40}
do something
in script 2
and run those separately without &. Thanks,
> ------------------------------------
>
> --
> Chen Wei
>
>
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