server-skynet-source-3rd-je.../jemalloc/INSTALL

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Building and installing jemalloc can be as simple as typing the following while
in the root directory of the source tree:
./configure
make
make install
=== Advanced configuration =====================================================
The 'configure' script supports numerous options that allow control of which
functionality is enabled, where jemalloc is installed, etc. Optionally, pass
any of the following arguments (not a definitive list) to 'configure':
--help
Print a definitive list of options.
--prefix=<install-root-dir>
Set the base directory in which to install. For example:
./configure --prefix=/usr/local
will cause files to be installed into /usr/local/include, /usr/local/lib,
and /usr/local/man.
--with-rpath=<colon-separated-rpath>
Embed one or more library paths, so that Crux's internal shared library can
find the libraries it is linked to. This works only on ELF-based systems.
--enable-debug
Enable assertions and validation code. This incurs a substantial
performance hit, but is very useful during application development.
--enable-stats
Enable statistics gathering functionality. Use the 'P' option to print
detailed allocation statistics at exit, and/or the 'U' option to print a
detailed allocation trace log.
--disable-tiny
Disable tiny (sub-quantum-sized) object support. Technically it is not
legal for a malloc implementation to allocate objects with less than
quantum alignment (8 or 16 bytes, depending on architecture), but in
practice it never causes any problems if, for example, 4-byte allocationsj
are 4-byte-aligned.
--disable-mag
Disable thread-specific caches for sub-page-sized objects. Objects are
cached and released in bulk using "magazines" -- a term coined by the
developers of Solaris's umem allocator.
--disable-balance
Disable dynamic rebalancing of thread-->arena assignments.
--enable-dss
Enable support for page allocation/deallocation via sbrk(2), in addition to
mmap(2).
--enable-fill
Enable support for junk/zero filling of memory. Use the 'J' option to
control junk filling, or the 'Z' option to control zero filling.
--enable-xmalloc
Enable support for optional immediate termination due to out-of-memory
errors, as is commonly implemented by "xmalloc" wrapper function for malloc.
Use the 'X' option to control termination behavior.
--enable-sysv
Enable support for System V semantics, wherein malloc(0) returns NULL
rather than a minimal allocation. Use the 'V' option to control System V
compatibility.
--enable-dynamic-page-shift
Under most conditions, the system page size never changes (usually 4KiB or
8KiB, depending on architecture and configuration), and unless this option
is enabled, jemalloc assumes that page size can safely be determined during
configuration and hard-coded. Enabling dynamic page size determination has
a measurable impact on performance, since the compiler is forced to load
the page size from memory rather than embedding immediate values.
--disable-lazy-lock
Disable code that wraps pthread_create() to detect when an application
switches from single-threaded to multi-threaded mode, so that it can avoid
mutex locking/unlocking operations while in single-threaded mode. In
practice, this feature usually has little impact on performance unless
magazines are disabled.
The following environment variables (not a definitive list) impact configure's
behavior:
CFLAGS="?"
Pass these flags to the compiler. You probably shouldn't define this unless
you know what you are doing. (Use EXTRA_CFLAGS instead.)
EXTRA_CFLAGS="?"
Append these flags to CFLAGS. This makes it possible to add flags such as
-Werror, while allowing the configure script to determine what other flags
are appropriate for the specified configuration.
The configure script specifically checks whether an optimization flag (-O*)
is specified in EXTRA_CFLAGS, and refrains from specifying an optimization
level if it finds that one has already been specified.
CPPFLAGS="?"
Pass these flags to the C preprocessor. Note that CFLAGS is not passed to
'cpp' when 'configure' is looking for include files, so you must use
CPPFLAGS instead if you need to help 'configure' find header files.
LD_LIBRARY_PATH="?"
'ld' uses this colon-separated list to find libraries.
LDFLAGS="?"
Pass these flags when linking.
PATH="?"
'configure' uses this to find programs.
=== Advanced compilation =======================================================
To run integrated regression tests, type:
make check
To clean up build results to varying degrees, use the following make targets:
clean
distclean
relclean
=== Advanced installation ======================================================
Optionally, define make variables when invoking make, including (not
exclusively):
INCLUDEDIR="?"
Use this as the installation prefix for header files.
LIBDIR="?"
Use this as the installation prefix for libraries.
MANDIR="?"
Use this as the installation prefix for man pages.
CC="?"
Use this to invoke the C compiler.
CFLAGS="?"
Pass these flags to the compiler.
CPPFLAGS="?"
Pass these flags to the C preprocessor.
LDFLAGS="?"
Pass these flags when linking.
PATH="?"
Use this to search for programs used during configuration and building.
=== Development ================================================================
If you intend to make non-trivial changes to jemalloc, use the 'autogen.sh'
script rather than 'configure'. This re-generates 'configure', enables
configuration dependency rules, and enables re-generation of automatically
generated source files.
The build system supports using an object directory separate from the source
tree. For example, you can create an 'obj' directory, and from within that
directory, issue configuration and build commands:
autoconf
mkdir obj
cd obj
../configure --enable-autogen
make