On Mon, 31 May 2021 06:37:40 GMT, Ambarish Rapte <ara...@openjdk.org> wrote:
>> `StyleManager.calculateCheckSum()` uses a raw InputStream as the input to a >> `DigestInputStream` and reads one byte at a time. This is slower in >> performance and should be changed, either to use `BufferedInputStream` or >> read byte buffer of 4096 from the stream or use both. >> >> I have tried three approaches and tested with modena.css which is ~134 KB in >> size. >> Following are the approaches and time in milliseconds taken by the method >> StyleManager.calculateCheckSum(), collected from 25 readings, >> >> 1. Use BufferedInputStream and read one byte at a time >> [commit#1](https://github.com/openjdk/jfx/commit/6cd7d44d0ce1084c6cdb06a698c7aca127a615ef) >> : >> - Maximum: 53 ms, Minimum: 27 ms, Average: 39 ms >> 2. Use BufferedInputStream and read buffer of 4096 at a time >> [commit#1+2](https://github.com/openjdk/jfx/pull/518/files/6e0c621ea62691d5402b2bca5951d1012a5b1b91) >> - Maximum: 17 ms, Minimum: 14 ms, Average: 15.58 ms >> 3. Use raw InputStream(current implementation) and read buffer of 4096 at a >> time >> [commit#1+2+3](https://github.com/openjdk/jfx/pull/518/files/215e1a183cfb902247f0d48685f7a901cb5fb003), >> which also similar to `NativeLibLoader.calculateCheckSum()` and looks >> faster than previous two. >> - Maximum: 16 ms, Minimum: 13 ms, Average: 14.25 ms >> >> >> The time taken by `StyleManager.calculateCheckSum()` with current >> implementation is, >> - Maximum: 61 ms, Minimum: 38 ms, Average: 50.58 ms >> >> >> Both approaches 2 & 3 show good improvement. I would prefer approach#3 as it >> is similar to `NativeLibLoader.calculateCheckSum()`. >> However we can choose approach#2 also. >> If we choose approach#3 then bug summary should be changed accordingly. > > Ambarish Rapte has updated the pull request with a new target base due to a > merge or a rebase. The incremental webrev excludes the unrelated changes > brought in by the merge/rebase. The pull request contains seven additional > commits since the last revision: > > - Merge branch 'master' into SM_BufferedInputStream_8239138 > - review update > - minor: format correction > - add test > - only buffer[4096], similar to NativeLibLoader.calculateCheckSum() > - BufferedInputStream + buffer[4096] > - use BufferedInputStream Marked as reviewed by kcr (Lead). ------------- PR: https://git.openjdk.java.net/jfx/pull/518
