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Full Discussion: Scheduling scheduling !!!
Top Forums Shell Programming and Scripting Scheduling scheduling !!! Post 302594443 by Corona688 on Tuesday 31st of January 2012 10:33:21 AM
Old 01-31-2012
cron is a very poor way to do this. I'd recommend using a makefile instead.

Code:
$ cat Makefile

# Note that the eight spaces in front of things are actually tabs and MUST BE TABS
# for the makefile to work correctly.
all:j1 j2 j3 j4 j5 j6 j7 j8 j9 j10
        echo "all jobs complete"

j1:
        sleep 1 ; echo $@
j2:
        sleep 1 ; echo $@
j3:
        sleep 1 ; echo $@
j4:
        sleep 1 ; echo $@
j5:
        sleep 1 ; echo $@
j6:
        sleep 1 ; echo $@
j7:
        sleep 1 ; echo $@
j8:
        sleep 1 ; echo $@
j9:
        sleep 1 ; echo $@
j10:
        sleep 1 ; echo $@

$ make

sleep 1 ; echo j1
j1
sleep 1 ; echo j2
j2
sleep 1 ; echo j3
j3
sleep 1 ; echo j4
j4
sleep 1 ; echo j5
j5
sleep 1 ; echo j6
j6
sleep 1 ; echo j7
j7
sleep 1 ; echo j8
j8
sleep 1 ; echo j9
j9
sleep 1 ; echo j10
j10
echo "all jobs complete"
all jobs complete

# Takes 10 seconds to run each job individually
$ time make

sleep 1 ; echo j1
j1
sleep 1 ; echo j2
j2
sleep 1 ; echo j3
j3
sleep 1 ; echo j4
j4
sleep 1 ; echo j5
j5
sleep 1 ; echo j6
j6
sleep 1 ; echo j7
j7
sleep 1 ; echo j8
j8
sleep 1 ; echo j9
j9
sleep 1 ; echo j10
j10
echo "all jobs complete"
all jobs complete

real    0m10.032s
user    0m0.006s
sys     0m0.009s

# ...but only one when you run all the echo's in parallel
$ time make -j 10
sleep 1 ; echo j1
sleep 1 ; echo j2
sleep 1 ; echo j3
sleep 1 ; echo j4
sleep 1 ; echo j5
sleep 1 ; echo j6
sleep 1 ; echo j7
sleep 1 ; echo j8
sleep 1 ; echo j9
sleep 1 ; echo j10
j1
j2
j3
j4
j5
j7
j6
j8
j9
j10
echo "all jobs complete"
all jobs complete

real    0m1.017s
user    0m0.009s
sys     0m0.007s

$

If you insist, you should even be able to run make from cron, like this:

Code:
/usr/bin/make -C /path/to/dir/ -j 10 2> /dev/null

which will cause it to run the Makefile inside /path/to/dir.
 

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LEARN ABOUT MOJAVE

systemd-suspend.service

SYSTEMD-SUSPEND.SERVICE(8)                                    systemd-suspend.service                                   SYSTEMD-SUSPEND.SERVICE(8)

NAME

       systemd-suspend.service, systemd-hibernate.service, systemd-hybrid-sleep.service, systemd-suspend-then-hibernate.service, systemd-sleep -
       System sleep state logic

SYNOPSIS

       systemd-suspend.service

       systemd-hibernate.service

       systemd-hybrid-sleep.service

       systemd-suspend-then-hibernate.service

       /lib/systemd/system-sleep

DESCRIPTION

       systemd-suspend.service is a system service that is pulled in by suspend.target and is responsible for the actual system suspend.
       Similarly, systemd-hibernate.service is pulled in by hibernate.target to execute the actual hibernation. Finally,
       systemd-hybrid-sleep.service is pulled in by hybrid-sleep.target to execute hybrid hibernation with system suspend and pulled in by
       suspend-then-hibernate.target to execute system suspend with a timeout that will activate hibernate later.

       Immediately before entering system suspend and/or hibernation systemd-suspend.service (and the other mentioned units, respectively) will
       run all executables in /lib/systemd/system-sleep/ and pass two arguments to them. The first argument will be "pre", the second either
       "suspend", "hibernate", "hybrid-sleep", or "suspend-then-hibernate" depending on the chosen action. Immediately after leaving system
       suspend and/or hibernation the same executables are run, but the first argument is now "post". All executables in this directory are
       executed in parallel, and execution of the action is not continued until all executables have finished.

       Note that scripts or binaries dropped in /lib/systemd/system-sleep/ are intended for local use only and should be considered hacks. If
       applications want to react to system suspend/hibernation and resume, they should rather use the Inhibitor interface[1].

       Note that systemd-suspend.service, systemd-hibernate.service, and systemd-hybrid-sleep.service systemd-suspend-then-hibernate.service
       should never be executed directly. Instead, trigger system sleep states with a command such as "systemctl suspend" or similar.

       Internally, this service will echo a string like "mem" into /sys/power/state, to trigger the actual system suspend. What exactly is written
       where can be configured in the "[Sleep]" section of /etc/systemd/sleep.conf or a sleep.conf.d file. See systemd-sleep.conf(5).

OPTIONS

       systemd-sleep understands the following commands:

       -h, --help
           Print a short help text and exit.

       --version
           Print a short version string and exit.

       suspend, hibernate, hybrid-sleep, suspend-then-hibernate
           Suspend, hibernate, suspend then hibernate, or put the system to hybrid sleep.

SEE ALSO

       systemd-sleep.conf(5), systemd(1), systemctl(1), systemd.special(7), systemd-halt.service(8)

NOTES

        1. Inhibitor interface
           https://www.freedesktop.org/wiki/Software/systemd/inhibit

systemd 237                                                                                                             SYSTEMD-SUSPEND.SERVICE(8)
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