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| author | George V. Neville-Neil <gnn@FreeBSD.org> | 2012-05-12 20:38:18 +0000 |
|---|---|---|
| committer | George V. Neville-Neil <gnn@FreeBSD.org> | 2012-05-12 20:38:18 +0000 |
| commit | 055173dba4a263acf10325a49eebf82915369ed2 (patch) | |
| tree | aec2772e8855e6dbaea6d8136ed0c47bcb825dee /Java/Readme | |
| parent | 87c8f7aa3a46118212b99f0d58b18aa93c06b02a (diff) | |
Notes
Diffstat (limited to 'Java/Readme')
| -rw-r--r-- | Java/Readme | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/Java/Readme b/Java/Readme new file mode 100644 index 0000000000000..ae455a524d1c8 --- /dev/null +++ b/Java/Readme @@ -0,0 +1,17 @@ +Java - DTracing Java + + These scripts trace the JVM, and require the Java hotspot provider which + was shipped with Java starting with version 1.6.0. + + Some of these scripts measure method and object events, and require + the Java process to be run using the "+ExtendedDTraceProbes" flag. + For example, + + java -XX:+ExtendedDTraceProbes classfile + + The ExtendedDTraceProbes flag is not on by default to avoid the additional + overhead for maintaining these additional probes. When this flag is + enabled, the JVM may execute slightly slower than before; when the probes + are also enabled (especially method probes), the JVM may execute + significantly slower. + |