CODEWITHSUNDEEP
bashtime
lak
lak

Reputation: 534

Sum time output from processes (bash)

I've made an script which measure the time of some processes. This is the file that I get:

real    0m6.768s
real    0m5.719s
real    0m5.173s
real    0m4.245s
real    0m5.257s
real    0m5.479s
real    0m6.446s
real    0m5.418s
real    0m5.654s

The command I use to get the time is this one:

{ time my-command } |& grep real >> times.txt

What I need is to sum all this times and get as a result how many (hours if applies) minutes and seconds using a bash script.

Upvotes: 2

Views: 463

Answers (2)

Saurabh P Bhandari
Saurabh P Bhandari

Reputation: 6742

Pipe the output to this command 

grep real | awk '{ gsub("m","*60+",$2); gsub("s","+",$2); printf("%s",$2); } END { printf("0\n"); }' | bc

This should work if you have generated the output using built-in time command. The output is in seconds.

Upvotes: 0

Nahuel Fouilleul
Nahuel Fouilleul

Reputation: 19315

From man bash, then if PAGER is less / time.

  If the time reserved word precedes a pipeline, the elapsed as well as user and system time consumed by its  exe-
  cution  are reported when the pipeline terminates.  The -p option changes the output format to that specified by
  POSIX.  The TIMEFORMAT variable may be set to a format string that specifies how the timing  information  should
   be displayed; see the description of TIMEFORMAT under Shell Variables below.

then /TIMEFORMAT

         The  optional  l  specifies  a  longer  format, including minutes, of the form MMmSS.FFs.  The value of p
         determines whether or not the fraction is included.


         If this variable is not set, bash acts as if it had the value  $'\nreal\t%3lR\nuser\t%3lU\nsys%3lS'.   If
         the  value  is  null,  no  timing  information is displayed.  A trailing newline is added when the format
         string is displayed.

If it can be changed to something like

TIMEFORMAT=$'\nreal\t%3R'

without the l, it may be easier to sum.

Note also format may depend on locale LANG:

compare

(LANG=fr_FR.UTF-8; time sleep 1)

and

(LANG=C; time sleep 1)

In that case the sum can be done with an external tool like awk

awk '/^real/ {sum+=$2} END{print sum} ' times.txt

or perl

perl -aln -e '$sum+=$F[1] if /^real/; END{print $sum}' times.txt

Upvotes: 1

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