Re: toolchain/26072 (Request: an option to build.sh, to build kernels without running "config" and "make depend")

[Luke Mewburn <luke%mewburn.net@localhost>]

The following reply was made to PR toolchain/26072; it has been noted by GNATS.

From: Luke Mewburn <luke%mewburn.net@localhost>
To: gnats-bugs%netbsd.org@localhost
Cc: misc-bug-people%netbsd.org@localhost, netbsd-bugs%netbsd.org@localhost,
	gnats-admin%netbsd.org@localhost, lukem%netbsd.org@localhost, fredb%immanent.net@localhost
Subject: Re: toolchain/26072 (Request: an option to build.sh, to build
 kernels without running "config" and "make depend")
Date: Sat, 20 May 2023 06:36:08 +1000

 On 23-05-19 20:31, Luke Mewburn wrote:
   | I did some testing on a modern system (AMD Ryzen 9 5950X 16-Core),
   | comparing using build.sh (with the config and make depend passes)
   | versus just building the kernel, both without any file changes
   | as well as touching a single source file:
   | 
   |         time ./build.sh -j32 kernel=GENERIC
   |         4.31s
   | 
   |         time nbmake-amd64 -C $SOMEDIR/sys/arch/amd64/compile/GENERIC
   |         1.18s    
 
 Oops, I forgot to use -j 32 in the nbmake-amd64 cases.
 I didn't mean that, because I wanted a fair comparison.
 
 Didn't matter; takes the same time.
 
 
   |         touch ./sys/dev/usb/xhci.c
   |         time ./build.sh -j32 kernel=GENERIC
   |         15.51s
   | 
   |         touch ./sys/dev/usb/xhci.c
   |         time nbmake-amd64 -C $SOMEDIR/sys/arch/amd64/compile/GENERIC
   |         12.33s
 
 With -j 32, nbmake isn't any quicker here either, recompiling a single file.
 
 
 regards,
 Luke.