On Wed, 3 Nov 2021 21:57:44 GMT, Claes Redestad <redes...@openjdk.org> wrote:
>> Prompted by a request from Volkan Yazıcı I took a look at why the java.time >> formatters are less efficient for some common patterns than custom >> formatters in apache-commons and log4j. This patch reduces the gap, without >> having looked at the third party implementations. >> >> When printing times: >> - Avoid turning integral values into `String`s before appending them to the >> buffer >> - Specialize `appendFraction` for `NANO_OF_SECOND` to avoid use of >> `BigDecimal` >> >> This means a speed-up and reduction in allocations when formatting almost >> any date or time pattern, and especially so when including sub-second parts >> (`S-SSSSSSSSS`). >> >> Much of the remaining overhead can be traced to the need to create a >> `DateTimePrintContext` and adjusting `Instant`s into a `ZonedDateTime` >> internally. We could likely also win performance by specializing some common >> patterns. >> >> Testing: tier1-3 > > Claes Redestad has updated the pull request incrementally with one additional > commit since the last revision: > > Remove accidentally committed experimental @Stable (no effect on micros) Thanks, Naoto! ------------- PR: https://git.openjdk.java.net/jdk/pull/6188
