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Time taken to compress a file [message #154788]

Tue, 10 January 2006 10:48

toshidas2000
Messages: 120
Registered: November 2005

Senior Member

All
How do I know, how much time it took to compress a file.

If I do
$ date
$ compress file_name

I have to keep an eye on monitor to see when it finishes and do date again.

Like oracle has set timing on and gives exact time taken to complete a command, do we have any similar on Unix (solaris).

Please help

Thanks

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Re: Time taken to compress a file [message #154822 is a reply to message #154788]

Tue, 10 January 2006 15:43

andrew again
Messages: 2577
Registered: March 2000

Senior Member

as far as I know, there is no way to do direct date arithmetic in shell scripting. You can do it in Perl and then call the Perl from your shell script.

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Re: Time taken to compress a file [message #154844 is a reply to message #154822]

Tue, 10 January 2006 23:25

tarundua
Messages: 1080
Registered: June 2005
Location: India

Senior Member

You can do something like this,

create a shell script

 $cat > elapsed_time.sh
 start_time=`date '+%d/%m/%y %H:%M:%S'`
 compress file_name # your command
 end_time=`date '+%d/%m/%y %H:%M:%S'`
 echo $start_time
 echo $end_time

so when you run the script you will get the start time as well as the end time.

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Re: Time taken to compress a file [message #154865 is a reply to message #154788]

Wed, 11 January 2006 01:23

rleishman
Messages: 3728
Registered: October 2005
Location: Melbourne, Australia

Senior Member

Just prefix the command with 'time'

time compress filename

Or, you really want to do the subtraction yourself, issue 3 commands in one line:

date; compress filename; date

_____________
Ross Leishman

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Re: Time taken to compress a file [message #154875 is a reply to message #154865]

Wed, 11 January 2006 01:53

tarundua
Messages: 1080
Registered: June 2005
Location: India

Senior Member

Wow, This command is new for me i.e. time.

Thanks R.Leishman.

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Re: Time taken to compress a file [message #154938 is a reply to message #154865]

Wed, 11 January 2006 07:45

toshidas2000
Messages: 120
Registered: November 2005

Senior Member

thanks a lot. The output shows three time what are those??

real 22m40.72s
user 15m42.62s
sys 1m44.95s

Thanks

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Re: Time taken to compress a file [message #155954 is a reply to message #154788]

Thu, 19 January 2006 19:22

*Jess*
Messages: 48
Registered: December 2005
Location: Penang, Malaysia

Member

Does this mean that the system can automatically estimate the duration for the compression to be end? The time should appeared before the compress job ended. This is from my understanding, correct me if I'm wrong.

Thanks.

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Re: Time taken to compress a file [message #155969 is a reply to message #155954]

Fri, 20 January 2006 00:48

rleishman
Messages: 3728
Registered: October 2005
Location: Melbourne, Australia

Senior Member

The output of time command appears immediately before control is passed back to the shell. So NO, it doesn't estimate.

: c985675 ~/sql; time sleep 6

real    0m6.096s
user    0m0.000s
sys     0m0.080s

The one you want is the 'real' time. It measures elapsed time.

I believe 'sys' is like 'cpu' time. Not sure what 'user' is.

_____________
Ross Leishman

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