Re: pg_preadv() and pg_pwritev()

Sergey Shinderuk <s.shinderuk@postgrespro.ru>

From: Sergey Shinderuk <s.shinderuk@postgrespro.ru>

To: Tom Lane <tgl@sss.pgh.pa.us>

Cc: Thomas Munro <thomas.munro@gmail.com>, pgsql-hackers <pgsql-hackers@postgresql.org>

Date: 2021-01-15T02:04:48Z

Lists: pgsql-hackers

On 15.01.2021 04:53, Sergey Shinderuk wrote:

> I see that "xcrun --sdk macosx --show-sdk-path" really calls
> "/Applications/Xcode.app/Contents/Developer/usr/bin/xcodebuild -sdk 
> macosx -version Path" under the hood.
> 

... and caches the result. xcodebuild not called without --no-cache.
So it still make sense to fall back on xcodebuild.

% sudo dtrace -n 'pid$target::popen:entry { trace(copyinstr(arg0)) }' -c 
'xcrun --sdk macosx --show-sdk-path'
dtrace: description 'pid$target::popen:entry ' matched 1 probe
/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX11.1.sdk
dtrace: pid 26981 has exited

Commits

Improve our heuristic for selecting PG_SYSROOT on macOS.
- 3934543c2bb0 9.5.25 landed
- fc6d08b27a33 9.6.21 landed
- 5fa060c8f593 10.16 landed
- 046c8facecee 11.11 landed
- f5d044eaeff0 12.6 landed
- f44ae4db5fec 13.2 landed
- 4823621db312 14.0 landed
Move our p{read,write}v replacements into their own files.
- 0d56acfbaa79 14.0 landed
Don't use elog() in src/port/pwrite.c.
- df10ac625c16 14.0 landed
Use vectored I/O to fill new WAL segments.
- ce6a71fa5300 14.0 landed
Provide pg_preadv() and pg_pwritev().
- 13a021f3e8c9 14.0 landed