Edit this Doc Memory Collection

Since Node v. 12 it is possible to collect the dumps of Appium's memory usage to be analyzed for problems. This is extremely useful for finding memory leaks.

Creating a dump file

To create a dump file at any given time, add the following command line parameter to node process, which executes the appium.js script:


where signal can be one of available custom signals, for example SIGUSR2. Then you will be able to

kill -SIGUSR2 <nodePID>

Dump files are created in the same folder where the main Appium script has been executed. They have the .heapsnapshot extension, and can be loaded into the Chrome Inspector for further investigation.


# 1. Go to the directory where appium is installed via NPM using one of the two cd command below, depending on appium 
# is installed globally or locally
## if your appium is globally installed via NPM with command "npm install -g appium":
cd "$(npm -g root)/appium/"
## else if your appium is locally installed via NPM:
cd "$(npm root)/appium/"

# 2. Start appium server with heapsnapshot signal
# "&" at the end puts the process at background, so we can continue working on the same terminal
node --heapsnapshot-signal=SIGUSR2 . &

# 3. Get the PID of previous node process

# 4. When it's time to dump the heap, issue a SIGUSR2 signal to the PID got above
kill -SIGUSR2 $pid
# Then the heap dump file is created in current directory

Dump file analysis

Read the Rising Stack article for more details.