collapse-jfr

This application is a converter from JFR file produced by Async-profiler in wall-clock mode to collapsed stack files:

• CPU collapsed stack
• Wall-clock collapsed stack
• Lock collapsed stack (Async-profiler 2.0+)
• Alloc count collapsed stack (Async-profiler 2.0+)
• Alloc size collapsed stack (Async-profiler 2.0+)

Async-profiler version

This tool works with Async-profiler in 1.* and 2.* versions. It works with the Async-profiler in multiple event mode, like wall,alloc,lock.

How to run

java -jar collapse-jfr-full.jar -d <dir> - will merge all files with .jfr extensions to cpu/wall collapsed stack files java -jar collapse-jfr-full.jar -f <file> - will convert one file to cpu/wall collapsed stack files

Output files:

• cpu.collapsed
• wall.collapsed
• lock.collapsed - if lock events are present
• alloc.count.collapsed - if alloc events are present
• alloc.size.collapsed - if alloc events are present

will be created in the directory you started process.

Access log filter

Collapse-jfr can filter your stack with

• end date
• duration
• thread id

It is design for access log/common log format.

Usage:

java -jar collapse-jfr-full.jar -d <dir> -al <end date> <duration>
java -jar collapse-jfr-full.jar -d <dir> -al <end date> <duration> -t <thread>
java -jar collapse-jfr-full.jar -f <file> -al <end date> <duration>
java -jar collapse-jfr-full.jar -f <file> -al <end date> <duration> -t <thread>

Example: For access log entry:

[17/Sep/2020:13:03:23 +0200] [POST /app/request HTTP/1.1] [302] [- bytes] [23513 ms] [http-nio-8080-exec-250]

You can run:

java -jar collapse-jfr-full.jar -d . -al "17/Sep/2020:13:03:23 +0200" 23513 -t http-nio-8080-exec-250