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This release of GraalVM also introduces a new tool for improving capturing and analyzing profiles of Java programs: proftool. It’s intended to provide machine-level details about the execution to aid with JIT performance analysis. At the moment it contains a JVMTI agent for capturing all the assembly generated by the JVM, a parser for Linux perf output, and a parser for HotSpot LogCompilation information. By combining these components into a single command line, the perf profile information can be attributed to the JIT code. Profile collection currently only supports Linux perf, though once the data is captured, then the profile can be viewed anywhere.
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