Native library optimization level research

This page will discuss all our native JDK libraries (except Hotspot) with regard to optimization levels, both what is currently used, and material for discussing a change.

Current C/C++ JDK native libraries, default (bold) and other optimization levels and the size of the libs on various platforms ; info is from JDK25

Optimizing levels marked with * have special settings e.g. regarding compiler version/debug level

TODOs: check LIBMANAGEMENT special optimization settings, are they still needed ?

Library	O-level	Linux ppc64le gcc 13.2.0 (SAP)	Linux x86_64 gcc 13.2.0 (SAP)	Linux aarch64 gcc 13.2.0 (SAP)	Macos aarch64 XCode 15.4 (SAP)	Macos x86_64 XCode 15.4 (SAP)	AIX ppc64 XLC 17.1.2 (SAP)	Windows x86_64 VS2022 17.6.5 (SAP)
LIBNET	LOW	84K	64K	84K	100K	76K	440K	52K
	HIGHEST	148K	64K	84K	116K	76K	444K	56K
	SIZE	88K	56K	84K	100K	72K	412K	52K
LIBNIO	HIGH	164K	108K	160K	128K	96K	704K	76K
	HIGHEST	164K	108K	160K	128K	96K	704K	84K
	SIZE	168K	96K	160K	132K	92K	684K	76K
LIBOSXSECURITY	LOW				80K	52K
	HIGHEST				80K	52K
	SIZE				80K	52K
LIBJSIG	LOW	76K	16K	76K	76K	40K	28K
	HIGHEST	76K	16K	76K	76K	40K	28K
	SIZE	76K	16K	76K	76K	40K	28K
LIBVERIFY	HIGH*	80K	68K	76K	108K	76K	292K	48K
	HIGHEST	80K	68K	76K	108K	76K	292K	56K
	SIZE	80K	68K	76K	92K	68K	224K	48K
LIBZIP	LOW	80K	48K	80K	164K	60K	472K	76K
	HIGHEST	80K	44K	80K	164K	60K	480K	84K
	SIZE	80K	44K	80K	148K	60K	376K	76K
LIBJAVA	HIGH	252K	172K	236K	188K	160K	1.5M	108K
	HIGHEST	252K	172K	236K	188K	160K	1.5M	124K
	SIZE	256K	160K	172K	188K	152K	1.5M	108K
LIBJIMAGE	LOW	228K	156K	164K	80K	56K	192K	28K
	HIGHEST	228K	160K	164K	80K	56K	192K	32K
	SIZE	228K	156K	164K	80K	52K	172K	28K
LIBJLI	HIGH	152K	76K	84K	152K	92K		80K
	HIGHEST	152K	76K	84K	152K	92K		88K
	SIZE	92K	64K	84K	136K	88K		80K
LIBJSOUND	LOW	164K	84K	92K	140K	108K		56K
	HIGHEST	164K	152K	156K	136K	108K		76K
	SIZE	168K	76K	92K	124K	88K		56K
LIBOSXAPP	LOW				192K	164K
	HIGHEST				192K	164K
	SIZE				192K	160K
LIBOSX	LOW				80K	48K
	HIGHEST				80K	48K
	SIZE				80K	48K
LIBAWT	HIGHEST	1.1M	876K	812K	528K	620K	5.1M	1.4M
	SIZE	688K	624K	620K	464K	500K	4.4M	1.3M
LIBAWT_HEADLESS	LOW	80K	48K	80K			284K
	HIGHEST	80K	48K	80K			284K
	SIZE	84K	44K	80K			284K
LIBAWT_XAWT	LOW	756K	540K	616K			3.0M
	HIGHEST	756K	556K	612K			3.0M
	SIZE	632K	480K	552K			2.8M
LIBAWT_LWAWT	LOW				1.2M	1.2M
	HIGHEST				1.2M	1.2M
	SIZE				1.2M	1.2M
LIBJAWT	LOW	72K	8K	76K	56K	32K	20K	12K
	HIGHEST	72K	8K	76K	56K	32K	20K	12K
	SIZE	72K	8K	76K	56K	32K	20K	12K
LIBSPLASHSCREEN	SIZE	376K	300K	368K	404K	316K	1.5M	208K
	HIGHEST	628K	464K	432K	500K	424K	1.9M	248K
LIBOSXUI	LOW				104K	68K
	HIGHEST				100K	68K
	SIZE				104K	64K
LIBINSTRUMENT	LOW	80K	56K	80K	96K	72K	552K	48K
	HIGHEST	80K	60K	80K	112K	72K	556K	52K
	SIZE	84K	52K	80K	96K	72K	512K	48K
LIBMANAGEMENT	HIGH*	80K	32K	80K	80K	48K	232K	20K
	HIGHEST	80K	32K	80K	80K	48K	232K	20K
	SIZE	80K	32K	80K	80K	48K	232K	20K
LIBPREFS	HIGH	76K	12K	76K	80K	48K	32K	16K
	HIGHEST	76K	12K	76K	80K	48K	32K	16K
	SIZE	76K	8K	76K	80K	48K	32K	16K
LIBRMI	LOW	72K	8K	76K	72K	36K	20K	12K
	HIGHEST	72K	8K	76K	72K	36K	20K	12K
	SIZE	72K	8K	76K	72K	36K	20K	12K
LIBJ2GSS	LOW	80K	56K	80K	96K	72K	184K	48K
	HIGHEST	80K	56K	80K	96K	72K	184K	48K
	SIZE	84K	52K	80K	96K	68K	176K	48K
LIBSSPI_BRIDGE	LOW							40K
	HIGHEST							44K
	SIZE							40K
LIBW2K_LSA_AUTH	LOW							28K
	HIGHEST							28K
	SIZE							28K
LIBOSXKRB5	LOW				80K	52K
	HIGHEST				76K	52K
	SIZE				80K	52K
LIBJ2PCSC	LOW	76K	20K	76K	76K	44K	92K	16K
	HIGHEST	76K	20K	76K	76K	44K	92K	16K
	SIZE	76K	20K	76K	76K	44K	80K	16K
LIBJAVAACCESSBRIDGE	LOW							296K
	HIGHEST							304K
	SIZE							296K
LIBATTACH	LOW	76K	16K	76K	76K	44K	44K	20K
	HIGHEST	76K	16K	76K	76K	44K	44K	20K
	SIZE	76K	16K	76K	76K	40K	44K	20K
LIBJ2PKCS11	LOW	148K	100K	152K	132K	108K	700K	76K
	HIGHEST	148K	100K	148K	132K	108K	704K	84K
	SIZE	152K	88K	148K	132K	100K	684K	76K
LIBSUNMSCAPI	LOW							44K
	HIGHEST							44K
	SIZE							44K
LIBDT_SHMEM	LOW							32K
	HIGHEST							36K
	SIZE							32K
LIBDT_SOCKET	LOW	80K	32K	80K	76K	52K	128K	32K
	HIGHEST	80K	36K	80K	76K	52K	128K	36K
	SIZE	80K	32K	80K	76K	48K	112K	32K
LIBJDWP	LOW	428K	304K	364K	312K	280K	1.9M	228K
	HIGHEST	428K	316K	364K	308K	288K	1.9M	260K
	SIZE	368K	268K	300K	296K	260K	1.8M	228K
LIBJPACKAGEAPPLAUNCHERAUX	LOW
	HIGHEST
	SIZE
LIBJPACKAGE	LOW							128K
	HIGHEST							140K
	SIZE							128K
LIBWIXHELPER	LOW
	HIGHEST
	SIZE
LIBMANAGEMENT_AGENT	LOW	72K	8K	76K	72K	36K	28K	16K
	HIGHEST	72K	8K	76K	72K	36K	28K	16K
	SIZE	76K	8K	76K	72K	36K	28K	16K
LIBMANAGEMENT_EXT	HIGH*	80K	40K	80K	80K	52K	224K	32K
	HIGHEST	80K	40K	80K	80K	52K	224K	32K
	SIZE	80K	40K	80K	80K	52K	220K	32K
LIBEXTNET	LOW	76K	16K	76K	76K	40K	48K	16K
	HIGHEST	76K	20K	76K	76K	40K	48K	16K
	SIZE	76K	16K	76K	76K	40K	44K	16K
LIBSCTP	LOW	80K	32K	80K
	HIGHEST	80K	36K	80K
	SIZE	80K	32K	80K
LIBJAAS	LOW	76K	8K	76K	72K	36K	32K	20K
	HIGHEST	76K	12K	76K	72K	36K	32K	20K
	SIZE	76K	8K	76K	72K	36K	32K	20K