On Wed, 15 Nov 2023 19:26:06 GMT, Eirik Bjorsnos <d...@openjdk.org> wrote:
>> Please review this PR which speeds up TestTooManyEntries and clarifies its >> purpose: >> >> - The name 'TestTooManyEntries' does not clearly convey the purpose of the >> test. What is tested is the validation that the total CEN size fits in a >> Java byte array. Suggested rename: CenSizeTooLarge >> - The test creates DEFLATED entries which incurs zlib costs and File Data / >> Data Descriptors for no additional benefit. We can use STORED instead. >> - By creating a single LocalDateTime and setting it with >> `ZipEntry.setTimeLocal`, we can avoid repeated time zone calculations. >> - The name of entries is generated by calling UUID.randomUUID, we could use >> simple counter instead. >> - The produced file is unnecessarily large. We know how large a CEN entry >> is, let's take advantage of that to create a file with the minimal size. >> - By adding a maximally large extra field to the CEN entries, we get away >> with fewer CEN records and save memory >> - The summary and comments of the test can be improved to help explain the >> purpose of the test and how we reach the limit being tested. >> - By writing sparse 'holes' until the last CEN entry, we can reduce required >> disk space. >> >> These speedups reduced the runtime from 4 min 17 sec to 3 seconds on my >> Macbook Pro. The produced ZIP size was reduced from 5.7 GB to ~4K. Memory >> consumption is down from 8GB to something like 12MB. > > Eirik Bjorsnos has updated the pull request incrementally with two additional > commits since the last revision: > > - Fix spelling of LocalDateTime > - Add comment to the SparseOutputStream class noting that instances must be > passed directly to the ZipOutputStream constructor, without buffering. Hello Eirik, the code comment updates look good to me. I went ahead and ran another run our CI with the latest mainline and it too passed fine. I'll go ahead and sponsor this now. ------------- PR Comment: https://git.openjdk.org/jdk/pull/12991#issuecomment-1813811258
