Performance when running executable shell scripts

Question

I've been using bamboo to automate tests and builds for awhile, but I recently added a performance test for some heavy c++ code to perform a variety of math based operations.  I'm just executing this from a shell script and I've noticed that when I run the shell script by hand on the same host and file system I consistently get about 10% shorter run times than from bamboo.  I was thinking this might be due to the capturing of the console output so I piped everything into the log in a background task and just had the bamboo job waiting on the task to finish but that didn't seem to have any effect.

I made sure my agent is spawning the script at the same nice level as a user would, but I'm out of other things to check.

Is there anything I can do to get similar performance as running the script standalone?

Foong · Answer

Since it is a heavy task, try increasing the heap memory in the remote agent <bamboo-agent-home>/conf/wrapper.conf:

wrapper.java.maxmemory=1024

The remote agent have to be restarted after the modification.

To make sure that the shell script is executed by the same interpreter, add the following line at the top of the script:

#!/bin/sh

After adding the shebang, test the running time between console and Bamboo remote agent again.

Kyle Brandstetter_klcmq2 · Answer

Linux, I see similiar behavior on remote agents or the host itself even when other jobs are not running.

Foong · Answer

Is the agent running on Windows or Linux?

Is it elastic or remote agent?