What is Java Profiling Support (Obsolete): -Xprof?

Usage:

• -Xprof

This feature was removed in Java 10.

Description:

The -Xprof argument enables profiling of CPU data from the JVM. Data are
printed to the standard output of the process after the JVM has completed
running with a section for each thread followed by a global summary, for example:

Flat profile of 0.52 secs (41 total ticks): main
Interpreted + native Method
7.9% 1 + 2 java.lang.ClassLoader.defineClass1
2.6% 0 + 1 java.util.zip.ZipFile.open
2.6% 1 + 0 java.io.ObjectInputStream.readObject
2.6% 1 + 0 java.util.zip.ZipFile.freeEntry
2.6% 0 + 1 sun.misc.Unsafe.defineAnonymousClass
2.6% 0 + 1 sun.nio.fs.UnixNativeDispatcher.rename0
2.6% 0 + 1 sun.nio.fs.UnixCopyFile.transfer
2.6% 0 + 1 sun.misc.Unsafe.getIntVolatile
...
73.7% 18 + 10 Total interpreted (including elided)
Compiled + native Method
2.6% 0 + 1 java.lang.reflect.Field.set
2.6% 0 + 1 Total compiled
Stub + native Method
7.9% 0 + 3 java.lang.System.arraycopy
5.3% 0 + 2 java.lang.Class.isPrimitive
2.6% 0 + 1 java.util.zip.ZipFile.getEntry
2.6% 0 + 1 java.util.zip.ZipFile.read
2.6% 0 + 1 java.lang.Object.clone
21.1% 0 + 8 Total stub
Thread-local ticks:
7.3% 3 Blocked (of total)
2.6% 1 Class loader
Global summary of 0.52 seconds:
100.0% 41 Received ticks
1
124.4% 51 Compilation
2.4% 1 Class loader
This profiling feature is rarely used and containe bugs that were known to
interfere with garbage collection, therefore it was removed in Java 10. When the
-Xprof option is used in Java 10 or above, a warning is printed at startup of
the JVM and no profiling output is produced.
As an alternative, the JVisualVM tool can be used

Default Value:

-Xprof is off by default.

Errors:

When -Xprof is used on Java 10 or higher, the following warning is printed:
OpenJDK 64-Bit Server VM warning: Ignoring option -Xprof; support was removed in 10.0
Arguments Related to -Xprof

Related Posts:

• JVisualVM Profiling Tool.

NOTE:
If you have additional comments, interesting experiences or even point of disagreement with this JVM argument description, please leave a comment. Your
insights will help the entire 10+ million java developer community to develop
one standard source of documentation for all the JVM arguments.