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

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)	Linux Alpine x86_64 gcc 12.2.1 (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	76K	100K	76K	440K	52K
	HIGHEST	148K	64K	84K	80K	116K	76K	444K	56K
	SIZE
LIBNIO	HIGH	164K	108K	160K	108K	128K	96K	704K	76K
	HIGHEST	164K	108K	160K	108K	128K	96K	704K	84K
	SIZE
LIBOSXSECURITY	LOW					80K	52K
	HIGHEST					80K	52K
	SIZE
LIBJSIG	LOW	76K	16K	76K	20K	76K	40K	28K
	HIGHEST	76K	16K	76K	20K	76K	40K	28K
	SIZE
LIBVERIFY	HIGH*	80K	68K	76K	68K	108K	76K	292K	48K
	HIGHEST	80K	68K	76K	68K	108K	76K	292K	56K
	SIZE
LIBZIP	LOW	80K	48K	80K	48K	164K	60K	472K	76K
	HIGHEST	80K	44K	80K	48K	164K	60K	480K	84K
	SIZE
LIBJAVA	HIGH	252K	172K	236K	172K	188K	160K	1.5M	108K
	HIGHEST	252K	172K	236K	172K	188K	160K	1.5M	124K
	SIZE
LIBJIMAGE	LOW	228K	156K	164K	148K	80K	56K	192K	28K
	HIGHEST	228K	160K	164K	168K	80K	56K	192K	32K
	SIZE
LIBJLI	HIGH	152K	76K	84K	76K	152K	92K		80K
	HIGHEST	152K	76K	84K	76K	152K	92K		88K
	SIZE
LIBJSOUND	LOW	164K	84K	92K	84K	140K	108K		56K
	HIGHEST	164K	152K	156K	156K	136K	108K		76K
	SIZE
LIBOSXAPP	LOW					192K	164K
	HIGHEST					192K	164K
	SIZE
LIBOSX	LOW					80K	48K
	HIGHEST					80K	48K
	SIZE
LIBAWT	HIGHEST	1.1M	876K	812K	880K	528K	620K	5.1M	1.4M
	SIZE
LIBAWT_HEADLESS	LOW	80K	48K	80K				284K
	HIGHEST	80K	48K	80K				284K
	SIZE
LIBAWT_XAWT	LOW	756K	540K	616K				3.0M
	HIGHEST	756K	556K	612K				3.0M
	SIZE
LIBAWT_LWAWT	LOW					1.2M	1.2M
	HIGHEST					1,2M	1.2M
	SIZE
LIBJAWT	LOW	72K	8K	76K		56K	32K	20K	12K
	HIGHEST	72K	8K	76K		56K	32K	20K	12K
	SIZE
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
LIBINSTRUMENT	LOW	80K	56K	80K		96K	72K	552K	48K
	HIGHEST	80K	60K	80K		112K	72K	556K	52K
	SIZE
LIBMANAGEMENT	HIGH*	80K	32K	80K		80K	48K	232K	20K
	HIGHEST	80K	32K	80K		80K	48K	232K	20K
	SIZE
LIBPREFS	HIGH	76K	12K	76K		80K	48K	32K	16K
	HIGHEST	76K	12K	76K		80K	48K	32K	16K
	SIZE
LIBRMI	LOW	72K	8K	76K		72K	36K	20K	12K
	HIGHEST	72K	8K	76K		72K	36K	20K	12K
	SIZE
LIBJ2GSS	LOW	80K	56K	80K		96K	72K	184K	48K
	HIGHEST	80K	56K	80K		96K	72K	184K	48K
	SIZE
LIBSSPI_BRIDGE	LOW								40K
	HIGHEST								44K
	SIZE
LIBW2K_LSA_AUTH	LOW								28K
	HIGHEST								28K
	SIZE
LIBOSXKRB5	LOW					80K	52K
	HIGHEST					76K	52K
	SIZE
LIBJ2PCSC	LOW	76K	20K	76K		76K	44K	92K	16K
	HIGHEST	76K	20K	76K		76K	44K	92K	16K
	SIZE
LIBJAVAACCESSBRIDGE	LOW								296K
	HIGHEST								304K
	SIZE
LIBATTACH	LOW	76K	16K	76K		76K	44K	44K	20K
	HIGHEST	76K	16K	76K		76K	44K	44K	20K
	SIZE
LIBJ2PKCS11	LOW	148K	100K	152K		132K	108K	700K	76K
	HIGHEST	148K	100K	148K		132K	108K	704K	84K
	SIZE
LIBSUNMSCAPI	LOW								44K
	HIGHEST								44K
	SIZE
LIBDT_SHMEM	LOW								32K
	HIGHEST								36K
	SIZE
LIBDT_SOCKET	LOW	80K	32K	80K		76K	52K	128K	32K
	HIGHEST	80K	36K	80K		76K	52K	128K	36K
	SIZE
LIBJDWP	LOW	428K	304K	364K		312K	280K	1.9M	228K
	HIGHEST	428K	316K	364K		308K	288K	1.9M	260K
	SIZE
LIBJPACKAGEAPPLAUNCHERAUX	LOW
	HIGHEST
	SIZE
LIBJPACKAGE	LOW								128K
	HIGHEST								140K
	SIZE
LIBWIXHELPER	LOW
	HIGHEST
	SIZE
LIBMANAGEMENT_AGENT	LOW	72K	8K	76K		72K	36K	28K	16K
	HIGHEST	72K	8K	76K		72K	36K	28K	16K
	SIZE
LIBMANAGEMENT_EXT	HIGH*	80K	40K	80K		80K	52K	224K	32K
	HIGHEST	80K	40K	80K		80K	52K	224K	32K
	SIZE
LIBEXTNET	LOW	76K	16K	76K		76K	40K	48K	16K
	HIGHEST	76K	20K	76K		76K	40K	48K	16K
	SIZE
LIBSCTP	LOW	80K	32K	80K
	HIGHEST	80K	36K	80K
	SIZE
LIBJAAS	LOW	76K	8K	76K		72K	36K	32K	20K
	HIGHEST	76K	12K	76K		72K	36K	32K	20K
	SIZE