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Inconsistent description of performance benefit of CDS #273

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@willy-b

Hello dev.java team!

Sharing what appears to be an unintentional discrepancy on one of your pages in case the team is interested to fix it.


In the latest version of https://dev.java/learn/jvm/cds-appcds/ (archived as is at https://megalodon.jp/2026-0814-0145-27/https://dev.java:443/learn/jvm/cds-appcds/ )

  • In the "Performance Benefits of CDS" description

    The performance gains from CDS are about 33% when tested using a simple "Hello World" application, as seen in the below test results:

    $ time java -Xshare:off HelloWorld
    Hello world!
    java -Xshare:off HelloWorld  0.08s
    $ time java -Xshare:on HelloWorld
    Hello world!
    java -Xshare:on HelloWorld  0.05s
    

    With -Xshare:off the execution time of the application was 0.10 seconds, while with -Xshare:on it was 0.05 seconds.

    the description "-Xshare:off the execution time of the application was 0.10 seconds, while with -Xshare:on it was 0.05 seconds" does not match the time output given immediately before that statement, which shows 0.08 seconds vs 0.05 seconds instead.

(Also I am not sure what version of the unix/POSIX time command (see in list https://en.wikipedia.org/w/index.php?title=List_of_POSIX_commands&oldid=1361676414 ) puts out the command a second time with the time next to it and does not display multiple types of duration (real/wallclock vs user or system CPU times) as is done above.)

Thanks very much!

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