Attention: Answers.ros.org is deprecated as of August the 11th, 2023. Please visit robotics.stackexchange.com to ask a new question. This site will remain online in read-only mode during the transition and into the foreseeable future. Selected questions and answers have been migrated, and redirects have been put in place to direct users to the corresponding questions on Robotics Stack Exchange. Additional details are available here.

Regarding output message of launch-prefix="time"

profiling

asked 2012-02-25 03:57:22 -0500

alfa_80
1051 ●123 ●137 ●150

I was running 2 nodes using launch file in which I include launch-prefix="time". The following is the obtained output message:

2.58user 2.89system 2:01.48elapsed 4%CPU (0avgtext+0avgdata 307200maxresident)k
0inputs+0outputs (0major+664215minor)pagefaults 0swaps
0.77user 0.23system 2:01.95elapsed 0%CPU (0avgtext+0avgdata 221712maxresident)k
0inputs+8outputs (0major+14178minor)pagefaults 0swaps

I have several questions regarding this which are listed as follow:

How do I interpret the output of it after killing all the running processes. Is it elapsed means time taken for that node and CPU means it used certain percent of it?
How do I know that which output message is corresponding to which node? Were they ordered in ascending or descending order, I mean the output message with respect to nodes placed in launch file?

Thanks in advance.

edit retag flag offensive close merge delete

add a comment

1 Answer

Sort by » oldest newest most voted

answered 2012-02-25 05:23:35 -0500

joq
25443 ●181 ●256 ●408

updated 2012-02-27 09:01:08 -0500

You can add a --format= option to your time prefix, with a printf()-style formatting string.

See "man time" for the details.

EDIT:

Launch the nodes with different prefix arguments, like this (untested):

launch-prefix = "/usr/bin/time --format='node1: %E sec, %P'"
launch-prefix = "/usr/bin/time --format='node2: %E sec, %P'"

edit flag offensive delete link

Comments

Could you give me an example of line that I can determine which node belongs to in order to differentiate them, printf()-style that u meant. How do I append that?

alfa_80 ( 2012-02-27 06:40:08 -0500 )edit

Thanks a lot, that works! I only edit the above as the following (launch-prefix = "time --format='node1: %E sec, %P'"), no difference I guess, feature-wise..

alfa_80 ( 2012-02-27 21:36:36 -0500 )edit

add a comment

Question Tools

Stats

Asked: 2012-02-25 03:57:22 -0500

Seen: 337 times

Last updated: Feb 27 '12

Regarding output message of launch-prefix="time" edit

1 Answer

Comments

Question Tools

Stats

Related questions

Regarding output message of launch-prefix="time"