uschindler commented on PR #13196:
URL: https://github.com/apache/lucene/pull/13196#issuecomment-2014839549

   It would be good if you always run tests with `./gradlew :lucene:core:test 
-Ptests.directory=MMapDirectory`
   
   This will use MMapDir for all tests. I have no macos machine, if somebody 
else could test the whole thing with macos (x86 and arm), it would be cool.
   
   It would also be good to get a printout of the haeder file containing those 
`POSIX_MADV_*` constants. Just grep on `POSIX_MADV_` through the include files 
(they are a bit hidden on macos, not in /usr/include, best is to search for 
`unistd.h` to find their location):
   
   ```
   serv1-vm2:include jenkins$ xcrun --show-sdk-path
   /Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk
   serv1-vm2:~ jenkins$ cd 
/Library/Developer/CommandLineTools/SDKs/MacOSX10.14.sdk/usr/include
   serv1-vm2:include jenkins$ fgrep -R POSIX_MADV *
   sys/mman.h:#define POSIX_MADV_NORMAL       0       /* [MC1] no further 
special treatment */
   sys/mman.h:#define POSIX_MADV_RANDOM       1       /* [MC1] expect random 
page refs */
   sys/mman.h:#define POSIX_MADV_SEQUENTIAL   2       /* [MC1] expect 
sequential page refs */
   sys/mman.h:#define POSIX_MADV_WILLNEED     3       /* [MC1] will need these 
pages */
   sys/mman.h:#define POSIX_MADV_DONTNEED     4       /* [MC1] dont need these 
pages */
   sys/mman.h:#define MADV_NORMAL             POSIX_MADV_NORMAL
   sys/mman.h:#define MADV_RANDOM             POSIX_MADV_RANDOM
   sys/mman.h:#define MADV_SEQUENTIAL         POSIX_MADV_SEQUENTIAL
   sys/mman.h:#define MADV_WILLNEED           POSIX_MADV_WILLNEED
   sys/mman.h:#define MADV_DONTNEED           POSIX_MADV_DONTNEED
   serv1-vm2:include jenkins$
   ```


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