Re: RFR: 8331114: Further improve performance of MethodTypeDesc::descriptorString [v4]
> When analyzing (startup) performance of the Classfile API I found this > opportunity to further improve `MethodTypeDescImpl::descriptorString`. > > Performance improves across the board in existing microbenchmarks: > > Name > (descString) Cnt Base ErrorTest Error Unit Change > MethodTypeDescFactories.descriptorString > (Ljava/lang/Object;Ljava/lang/String;)I 6 55,179 ± 2,027 32,920 ± 1,189 > ns/op 1,68x (p = 0,000*) > MethodTypeDescFactories.descriptorString > ()V 6 17,689 ± 1,871 11,060 ± 0,331 ns/op 1,60x (p = 0,000*) > MethodTypeDescFactories.descriptorString > ([IJLjava/lang/String;Z)Ljava/util/List; 6 86,627 ± 1,646 41,035 ± 0,636 > ns/op 2,11x (p = 0,000*) > MethodTypeDescFactories.descriptorString > ()[Ljava/lang/String; 6 18,305 ± 1,974 13,110 ± 0,089 ns/op 1,40x (p = > 0,000*) > * = significant > > > The improvement is even more pronounced when running with `-Xint`, which is > relevant for reducing startup overheads of early ClassFile API use: > > Name > (descString) Cnt Base Error Test Error Unit Change > MethodTypeDescFactories.descriptorString > (Ljava/lang/Object;Ljava/lang/String;)I 6 5122,061 ± 81,335 2626,481 ± > 101,466 ns/op 1,95x (p = 0,000*) > MethodTypeDescFactories.descriptorString > ()V 6 3481,316 ± 258,904 1489,267 ± 15,506 ns/op 2,34x (p = 0,000*) > MethodTypeDescFactories.descriptorString > ([IJLjava/lang/String;Z)Ljava/util/List; 6 7741,081 ± 1628,244 3281,778 ± > 41,892 ns/op 2,36x (p = 0,000*) > MethodTypeDescFactories.descriptorString > ()[Ljava/lang/String; 6 3677,803 ± 63,432 1495,291 ± 8,995 ns/op > 2,46x (p = 0,000*) > * = significant > ``` > > I also applied similar approach to `MethodTypeDesc::displayDescriptor`: > while not performance sensitive I think these are so inter-related that it > makes sense to implement them in a similar fashion. Claes Redestad has updated the pull request incrementally with one additional commit since the last revision: Use returnType field directly - Changes: - all: https://git.openjdk.org/jdk/pull/18945/files - new: https://git.openjdk.org/jdk/pull/18945/files/15c8d39c..6ff505f6 Webrevs: - full: https://webrevs.openjdk.org/?repo=jdk&pr=18945&range=03 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=18945&range=02-03 Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod Patch: https://git.openjdk.org/jdk/pull/18945.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/18945/head:pull/18945 PR: https://git.openjdk.org/jdk/pull/18945
Re: RFR: 8331114: Further improve performance of MethodTypeDesc::descriptorString [v4]
On Fri, 26 Apr 2024 08:07:04 GMT, Claes Redestad wrote: >> When analyzing (startup) performance of the Classfile API I found this >> opportunity to further improve `MethodTypeDescImpl::descriptorString`. >> >> Performance improves across the board in existing microbenchmarks: >> >> Name >> (descString) Cnt Base ErrorTest Error Unit Change >> MethodTypeDescFactories.descriptorString >> (Ljava/lang/Object;Ljava/lang/String;)I 6 55,179 ± 2,027 32,920 ± 1,189 >> ns/op 1,68x (p = 0,000*) >> MethodTypeDescFactories.descriptorString >> ()V 6 17,689 ± 1,871 11,060 ± 0,331 ns/op 1,60x (p = 0,000*) >> MethodTypeDescFactories.descriptorString >> ([IJLjava/lang/String;Z)Ljava/util/List; 6 86,627 ± 1,646 41,035 ± 0,636 >> ns/op 2,11x (p = 0,000*) >> MethodTypeDescFactories.descriptorString >> ()[Ljava/lang/String; 6 18,305 ± 1,974 13,110 ± 0,089 ns/op 1,40x (p = >> 0,000*) >> * = significant >> >> >> The improvement is even more pronounced when running with `-Xint`, which is >> relevant for reducing startup overheads of early ClassFile API use: >> >> Name >> (descString) Cnt Base Error Test Error Unit Change >> MethodTypeDescFactories.descriptorString >> (Ljava/lang/Object;Ljava/lang/String;)I 6 5122,061 ± 81,335 2626,481 ± >> 101,466 ns/op 1,95x (p = 0,000*) >> MethodTypeDescFactories.descriptorString >> ()V 6 3481,316 ± 258,904 1489,267 ± 15,506 ns/op 2,34x (p = 0,000*) >> MethodTypeDescFactories.descriptorString >> ([IJLjava/lang/String;Z)Ljava/util/List; 6 7741,081 ± 1628,244 3281,778 ± >> 41,892 ns/op 2,36x (p = 0,000*) >> MethodTypeDescFactories.descriptorString >> ()[Ljava/lang/String; 6 3677,803 ± 63,432 1495,291 ± 8,995 ns/op >> 2,46x (p = 0,000*) >> * = significant >> ``` >> >> I also applied similar approach to `MethodTypeDesc::displayDescriptor`: >> while not performance sensitive I think these are so inter-related that it >> makes sense to implement them in a similar fashion. > > Claes Redestad has updated the pull request incrementally with one additional > commit since the last revision: > > Use returnType field directly I am glad that this only focuses on the descriptor string as `MethodTypeDesc::displayDescriptor` is typically used for debugging and exception message and not performance-sensitive. - Marked as reviewed by mchung (Reviewer). PR Review: https://git.openjdk.org/jdk/pull/18945#pullrequestreview-2025627526
Re: RFR: 8331114: Further improve performance of MethodTypeDesc::descriptorString [v4]
On Fri, 26 Apr 2024 08:07:04 GMT, Claes Redestad wrote: >> When analyzing (startup) performance of the Classfile API I found this >> opportunity to further improve `MethodTypeDescImpl::descriptorString`. >> >> Performance improves across the board in existing microbenchmarks: >> >> Name >> (descString) Cnt Base ErrorTest Error Unit Change >> MethodTypeDescFactories.descriptorString >> (Ljava/lang/Object;Ljava/lang/String;)I 6 55,179 ± 2,027 32,920 ± 1,189 >> ns/op 1,68x (p = 0,000*) >> MethodTypeDescFactories.descriptorString >> ()V 6 17,689 ± 1,871 11,060 ± 0,331 ns/op 1,60x (p = 0,000*) >> MethodTypeDescFactories.descriptorString >> ([IJLjava/lang/String;Z)Ljava/util/List; 6 86,627 ± 1,646 41,035 ± 0,636 >> ns/op 2,11x (p = 0,000*) >> MethodTypeDescFactories.descriptorString >> ()[Ljava/lang/String; 6 18,305 ± 1,974 13,110 ± 0,089 ns/op 1,40x (p = >> 0,000*) >> * = significant >> >> >> The improvement is even more pronounced when running with `-Xint`, which is >> relevant for reducing startup overheads of early ClassFile API use: >> >> Name >> (descString) Cnt Base Error Test Error Unit Change >> MethodTypeDescFactories.descriptorString >> (Ljava/lang/Object;Ljava/lang/String;)I 6 5122,061 ± 81,335 2626,481 ± >> 101,466 ns/op 1,95x (p = 0,000*) >> MethodTypeDescFactories.descriptorString >> ()V 6 3481,316 ± 258,904 1489,267 ± 15,506 ns/op 2,34x (p = 0,000*) >> MethodTypeDescFactories.descriptorString >> ([IJLjava/lang/String;Z)Ljava/util/List; 6 7741,081 ± 1628,244 3281,778 ± >> 41,892 ns/op 2,36x (p = 0,000*) >> MethodTypeDescFactories.descriptorString >> ()[Ljava/lang/String; 6 3677,803 ± 63,432 1495,291 ± 8,995 ns/op >> 2,46x (p = 0,000*) >> * = significant >> ``` >> >> I also applied similar approach to `MethodTypeDesc::displayDescriptor`: >> while not performance sensitive I think these are so inter-related that it >> makes sense to implement them in a similar fashion. > > Claes Redestad has updated the pull request incrementally with one additional > commit since the last revision: > > Use returnType field directly Marked as reviewed by liach (Author). Marked as reviewed by liach (Author). - PR Review: https://git.openjdk.org/jdk/pull/18945#pullrequestreview-2025741971 PR Review: https://git.openjdk.org/jdk/pull/18945#pullrequestreview-2025743039
Re: RFR: 8331114: Further improve performance of MethodTypeDesc::descriptorString [v4]
On Fri, 26 Apr 2024 18:21:16 GMT, Mandy Chung wrote: > I am glad that this only focuses on the descriptor string as > `MethodTypeDesc::displayDescriptor` is typically used for debugging and > exception message and not performance-sensitive. Yes, which is why I'd really like to desugar it: this is the method where I tripped on a bootstrap circularity when print-debugging an issue in the lambda code generator. It's no fun at all hitting bootstrapping issues when calling innocuous methods in `java.lang.*` Obviously the performance of it is not important - I was just stringing it along for consistency. - PR Comment: https://git.openjdk.org/jdk/pull/18945#issuecomment-2080016093
Re: RFR: 8331114: Further improve performance of MethodTypeDesc::descriptorString [v4]
On Fri, 26 Apr 2024 08:07:04 GMT, Claes Redestad wrote: >> When analyzing (startup) performance of the Classfile API I found this >> opportunity to further improve `MethodTypeDescImpl::descriptorString`. >> >> Performance improves across the board in existing microbenchmarks: >> >> Name >> (descString) Cnt Base ErrorTest Error Unit Change >> MethodTypeDescFactories.descriptorString >> (Ljava/lang/Object;Ljava/lang/String;)I 6 55,179 ± 2,027 32,920 ± 1,189 >> ns/op 1,68x (p = 0,000*) >> MethodTypeDescFactories.descriptorString >> ()V 6 17,689 ± 1,871 11,060 ± 0,331 ns/op 1,60x (p = 0,000*) >> MethodTypeDescFactories.descriptorString >> ([IJLjava/lang/String;Z)Ljava/util/List; 6 86,627 ± 1,646 41,035 ± 0,636 >> ns/op 2,11x (p = 0,000*) >> MethodTypeDescFactories.descriptorString >> ()[Ljava/lang/String; 6 18,305 ± 1,974 13,110 ± 0,089 ns/op 1,40x (p = >> 0,000*) >> * = significant >> >> >> The improvement is even more pronounced when running with `-Xint`, which is >> relevant for reducing startup overheads of early ClassFile API use: >> >> Name >> (descString) Cnt Base Error Test Error Unit Change >> MethodTypeDescFactories.descriptorString >> (Ljava/lang/Object;Ljava/lang/String;)I 6 5122,061 ± 81,335 2626,481 ± >> 101,466 ns/op 1,95x (p = 0,000*) >> MethodTypeDescFactories.descriptorString >> ()V 6 3481,316 ± 258,904 1489,267 ± 15,506 ns/op 2,34x (p = 0,000*) >> MethodTypeDescFactories.descriptorString >> ([IJLjava/lang/String;Z)Ljava/util/List; 6 7741,081 ± 1628,244 3281,778 ± >> 41,892 ns/op 2,36x (p = 0,000*) >> MethodTypeDescFactories.descriptorString >> ()[Ljava/lang/String; 6 3677,803 ± 63,432 1495,291 ± 8,995 ns/op >> 2,46x (p = 0,000*) >> * = significant >> ``` >> >> I also applied similar approach to `MethodTypeDesc::displayDescriptor`: >> while not performance sensitive I think these are so inter-related that it >> makes sense to implement them in a similar fashion. > > Claes Redestad has updated the pull request incrementally with one additional > commit since the last revision: > > Use returnType field directly test/micro/org/openjdk/bench/java/lang/constant/MethodTypeDescFactories.java line 1: > 1: /* You can update the copyright of this file if you don't mind. - PR Review Comment: https://git.openjdk.org/jdk/pull/18945#discussion_r1581519592
