RFR: 8349378: Build splashscreen lib with SIZE optimization

[Harshitha Onkar]

On Thu, 6 Feb 2025 13:52:49 GMT, Matthias Baesken <mbaesken at openjdk.org> wrote:

> The splashscreen lib is currently built with LOW optimization.
> This might be fine because it is not very performance critical  (and LOW is not really low when looking at the opt-flags used).
> But building it with SIZE optimization makes it 10-20 % smaller on some platforms which helps to reduce image size.
> 
> current settings (LOW optimization) :
> ---------------------------------------------------
> 2.5M /aix_ppc64/jdk-opt/images/jdk/lib/libsplashscreen.so  (not split debuginfo file on AIX currently)
> 
> 468K /macosaarch64/jdk-opt/images/jdk/lib/libsplashscreen.dylib
> 1.6M /macosaarch64/jdk-opt/images/jdk/lib/libsplashscreen.dylib.dSYM
> 388K /macosintel64/jdk-opt/images/jdk/lib/libsplashscreen.dylib
> 1.5M /macosintel64/jdk-opt/images/jdk/lib/libsplashscreen.dylib.dSYM
> 
> 368K /linux_aarch64/jdk-opt/images/jdk/lib/libsplashscreen.so
> 1.7M /linux_aarch64/jdk-opt/images/jdk/lib/libsplashscreen.debuginfo
> 376K /linux_alpine_x86_64/jdk-opt/images/jdk/lib/libsplashscreen.so
> 1.8M /linux_alpine_x86_64/jdk-opt/images/jdk/lib/libsplashscreen.debuginfo
> 500K /linux_ppc64le/jdk-opt/images/jdk/lib/libsplashscreen.so
> 1.7M /linux_ppc64le/jdk-opt/images/jdk/lib/libsplashscreen.debuginfo
> 364K /linux_x86_64/jdk-opt/images/jdk/lib/libsplashscreen.so
> 1.7M /linux_x86_64/jdk-opt/images/jdk/lib/libsplashscreen.debuginfo
> 
> 
> new settings (SIZE optimization) :
> --------------------------------------------------
> 2.1M /aix_ppc64/jdk-dev-opt/images/jdk/lib/libsplashscreen.so    (not split debuginfo file on AIX currently)
> 
> 404K /macosaarch64/jdk-dev-opt/images/jdk/lib/libsplashscreen.dylib
> 1.5M /macosaarch64/jdk-dev-opt/images/jdk/lib/libsplashscreen.dylib.dSYM
> 316K /macosintel64/jdk-dev-opt/images/jdk/lib/libsplashscreen.dylib
> 1.4M /macosintel64/jdk-dev-opt/images/jdk/lib/libsplashscreen.dylib.dSYM
> 
> 372K /linux_aarch64/jdk-dev-opt/images/jdk/lib/libsplashscreen.so
> 1.5M /linux_aarch64/jdk-dev-opt/images/jdk/lib/libsplashscreen.debuginfo
> 304K /linux_alpine_x86_64/jdk-dev-opt/images/jdk/lib/libsplashscreen.so
> 1.5M /linux_alpine_x86_64/jdk-dev-opt/images/jdk/lib/libsplashscreen.debuginfo
> 376K /linux_ppc64le/jdk-dev-opt/images/jdk/lib/libsplashscreen.so
> 1.4M /linux_ppc64le/jdk-dev-opt/images/jdk/lib/libsplashscreen.debuginfo
> 304K /linux_x86_64/jdk-dev-opt/images/jdk/lib/libsplashscreen.so
> 1.4M /linux_x86_64/jdk-dev-opt/images/jdk/lib/libsplashscreen.debuginfo
> 
> On Linux aarch64 only the debuginfo shrinks but the lib stays about the same in size. Maybe -Os does not work as well on this platform.
> Other UNIX pl...

SplashScreen tests work as expected on all platforms. No regressions observed.

With optimization=SIZE, libsplashscreen image file sizes are less on linux and macOS.
On the contrary, the .dll files on Windows were slightly bigger with opt=SIZE than with opt=LOW for me (Win 11 x86-64).  Details below.


macOS
--------
408K Feb 10 14:59 libsplashscreen.dylib
96B Feb 10 15:00 libsplashscreen.dylib.dSYM

344K Feb 11 10:38 libsplashscreen.dylib
96B Feb 11 10:39 libsplashscreen.dylib.dSYM

Linux
-----
1.7M Feb 10 16:39 libsplashscreen.debuginfo
364K Feb 10 16:39 libsplashscreen.so

1.4M Feb 11 10:58 libsplashscreen.debuginfo
293K Feb 11 10:58 libsplashscreen.so

Windows
----------
201K Feb  7 15:37 splashscreen.dll
177K Feb  7 15:37 splashscreen.dll.map
1.6M Feb  7 15:37 splashscreen.dll.pdb

547K Feb 11 11:31 splashscreen.dll
281K Feb 11 11:31 splashscreen.dll.map
1.7M Feb 11 11:31 splashscreen.dll.pdb

-------------

PR Review: https://git.openjdk.org/jdk/pull/23493#pullrequestreview-2609945290