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# Leak Gauge
Leak Gauge is a tool that can be used to detect certain kinds of leaks
in Gecko, including those involving documents, window objects, and
docshells. It has two parts: instrumentation in Gecko that produces a
log file, and a script to post-process the log file.
## Getting a log file
To get a log file, run the browser with these settings:
NSPR_LOG_MODULES=DOMLeak:5,DocumentLeak:5,nsDocShellLeak:5,NodeInfoManagerLeak:5
NSPR_LOG_FILE=nspr.log # or any other filename of your choice
This overwrites any existing file named `nspr.log`. The browser runs
with a negligible slowdown. For reliable results, exit the browser
before post-processing the log file.
## Post-processing the log file
Post-process the log file with
[tools/leak-gauge/leak-gauge.pl](https://searchfox.org/mozilla-central/source/tools/leak-gauge/leak-gauge.html)
If there are no leaks, the output looks like this:
Results of processing log leak.log :
Summary:
Leaked 0 out of 11 DOM Windows
Leaked 0 out of 44 documents
Leaked 0 out of 3 docshells
Leaked content nodes in 0 out of 0 documents
If there are leaks, the output looks like this:
Results of processing log leak2.log :
Leaked outer window 2c6e410 at address 2c6e410.
Leaked outer window 2c6ead0 at address 2c6ead0.
Leaked inner window 2c6ec80 (outer 2c6ead0) at address 2c6ec80.
Summary:
Leaked 13 out of 15 DOM Windows
Leaked 35 out of 46 documents
Leaked 4 out of 4 docshells
Leaked content nodes in 42 out of 53 documents
If you find leaks, please file a bug report.
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