> `jcmd` provides great diagnostics but many commands lack a timestamp in their > output. > Adding a timestamp to the output of some would add value for those debugging > JVM data. > > With this MR I propose to introduce time-stamping to all diagnostic `jcmd` > commands in a form of an additional common flag "-t": > > jcmd [pid | main-class] [-t] command... | PerfCounter.print | -f filename > ^^^^ > > > This is a simplified approach to handle timestamp (v1 is > [here](https://github.com/openjdk/jdk/pull/27368)) > > Some diagnostic commands already provide timestamps information. For example > `Thread.print` already starts with a timestamp of "yyyy-MM-dd HH:mm:ss" > format. > In that case the timestamp is printed twice if "-t" flag is passed to > `Thread.print`. > > The time format for the generic timestamp is ISO 8601. Example: > `2026-01-21T16:58:49.518+0100`
Ivan Bereziuk has updated the pull request incrementally with three additional commits since the last revision: - change timestamp format to ISO 8601 - lowercase flag - improve test. Assert new ISO 8601 format ------------- Changes: - all: https://git.openjdk.org/jdk/pull/29325/files - new: https://git.openjdk.org/jdk/pull/29325/files/eaea764d..1047677b Webrevs: - full: https://webrevs.openjdk.org/?repo=jdk&pr=29325&range=01 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=29325&range=00-01 Stats: 21 lines in 6 files changed: 1 ins; 5 del; 15 mod Patch: https://git.openjdk.org/jdk/pull/29325.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/29325/head:pull/29325 PR: https://git.openjdk.org/jdk/pull/29325
