The Persistent Memory Development Kit (PMDK) is a collection of libraries and tools for System Administrators and Application Developers to simplify managing and accessing persistent memory devices. For more information, see https://pmem.io.
To install PMDK libraries, either install pre-built packages, which we build for every stable release, or clone the tree and build it yourself. Pre-built packages can be found in popular Linux distribution package repositories, or you can check out our recent stable releases on our github release page. Specific installation instructions are outlined below.
Bugs and feature requests for this repo are tracked in our GitHub Issues Database.
- Libraries and Utilities
- Getting Started
- Version Conventions
- Dependencies
- Building PMDK on Linux or FreeBSD
- Debugging
- Experimental Packages
- Contact Us
All PMDK related libraries are described in detail on pmem.io/pmdk.
Libraries available in this repository:
-
libpmem: provides low level persistent memory support.
-
libpmem2: provides low level persistent memory support, is a new version of libpmem.
NOTICE: Support for async functions is deprecated since PMDK 1.13.0 release and will be removed in the PMDK 1.14.0 release along with the miniasync dependency.
-
libpmemobj: provides a transactional object store, providing memory allocation, transactions, and general facilities for persistent memory programming.
-
libpmemblk: supports arrays of pmem-resident blocks, all the same size, that are atomically updated. (DEPRECATED)
NOTICE: The libpmemblk library is deprecated since PMDK 1.13.0 release and will be removed in the PMDK 1.14.0 release.
- libpmemlog: provides a pmem-resident log file. (DEPRECATED)
NOTICE: The libpmemlog library is deprecated since PMDK 1.13.0 release and will be removed in the PMDK 1.14.0 release.
- libpmempool: provides support for off-line pool management and diagnostics.
Libpmemset has been removed from PMDK repository.
Librpmem library has been removed from PMDK repository. If you are interested in a remote persistent memory support please look at new librpma.
If you're looking for libvmem and libvmmalloc, they have been moved to a separate repository.
Available Utilities:
-
pmempool: Manage and analyze persistent memory pools with this stand-alone utility
-
pmemcheck: Use dynamic runtime analysis with an enhanced version of Valgrind for use with persistent memory.
Currently these libraries only work on 64-bit Linux and 64-bit FreeBSD 11+*. For information on how these libraries are licensed, see our LICENSE file.
NOTICE: Support for Windows and FreeBSD are deprecated since PMDK 1.13.0 release and will be removed in the PMDK 1.14.0 release.
* DAX is not yet supported in FreeBSD, so at this time PMDK is available as a technical preview release for development purposes.
Getting Started with Persistent Memory Programming is a tutorial series created by Intel architect, Andy Rudoff. In this tutorial, you will be introduced to persistent memory programming and learn how to apply it to your applications.
- Part 1: What is Persistent Memory?
- Part 2: Describing The SNIA Programming Model
- Part 3: Introduction to PMDK Libraries
- Part 4: Thinking Transactionally
- Part 5: A C++ Example
Additionally, we recommend reading Introduction to Programming with Persistent Memory from Intel
- Builds are tagged something like
0.2+b1, which means Build 1 on top of version 0.2 - Release Candidates have a '-rc{version}' tag, e.g.
0.2-rc3, meaning Release Candidate 3 for version 0.2 - Stable Releases use a major.minor tag like
0.2
Required packages for each supported OS are listed below. It is important to note that some tests and example applications require additional packages, but they do not interrupt building if they are missing. An appropriate message is displayed instead. For details please read the DEPENDENCIES section in the appropriate README file (in tests/ or examples/ sub-directories).
See our Dockerfiles (used e.g. on our CI systems) to get an idea what packages are required to build the entire PMDK, with all the tests and examples.
You will need to install the following required packages on the build system:
- autoconf
- pkg-config
- libndctl-devel (v63 or later)
- libdaxctl-devel (v63 or later)
- pandoc (for documentation, required during install)
The following packages are required only by selected PMDK components or features:
PMDK depends on libndctl to support RAS features. It is possible to disable this support by passing NDCTL_ENABLE=n to "make", but we strongly discourage users from doing that. Disabling NDCTL strips PMDK from ability to detect hardware failures, which may lead to silent data corruption. For information how to disable RAS at runtime for kernels prior to 5.0.4 please see pmem#4207.
NOTICE: Support for FreeBSD is deprecated since PMDK 1.13.0 release and will be removed in the PMDK 1.14.0 release.
- autoconf
- bash
- binutils
- coreutils
- e2fsprogs-libuuid
- gmake
- libunwind
- ncurses*
- pkgconf
* The pkg version of ncurses is required for proper operation; the base version included in FreeBSD is not sufficient.
NOTICE: Support for FreeBSD is deprecated since PMDK 1.13.0 release and will be removed in the PMDK 1.14.0 release.
To build from source, clone this tree:
$ git clone https://github.com/pmem/pmdk
$ cd pmdk
For a stable version, checkout a release tag as follows. Otherwise skip this step to build the latest development release.
$ git checkout tags/1.13.0
Once the build system is setup, the Persistent Memory Development Kit is built using the make command at the top level:
$ make
For FreeBSD, use gmake rather than make.
By default, all code is built with the -Werror flag, which fails
the whole build when the compiler emits any warning. This is very useful during
development, but can be annoying in deployment. If you want to disable -Werror,
use the EXTRA_CFLAGS variable:
$ make EXTRA_CFLAGS="-Wno-error"
or
$ make EXTRA_CFLAGS="-Wno-error=$(type-of-warning)"
There are many options that follow make. If you want to invoke make with the same variables multiple times, you can create a user.mk file in the top level directory and put all variables there.
For example:
$ cat user.mk
EXTRA_CFLAGS_RELEASE = -ggdb -fno-omit-frame-pointer
PATH += :$HOME/valgrind/bin
This feature is intended to be used only by developers and it may not work for all variables. Please do not file bug reports about it. Just fix it and make a PR.
Built-in tests: can be compiled and ran with different compiler. To do this, you must provide the CC and CXX variables. These variables are independent and setting CC=clang does not set CXX=clang++.
For example:
$ make CC=clang CXX=clang++
Once make completes, all the libraries and examples are built. You can play with the library within the build tree, or install it locally on your machine. For information about running different types of tests, please refer to the src/test/README.
Installing the library is convenient since it installs man pages and libraries in the standard system locations:
(as root...)
# make install
To install this library into other locations, you can use the prefix variable, e.g.:
$ make install prefix=/usr/local
This will install files to /usr/local/lib, /usr/local/include /usr/local/share/man.
Prepare library for packaging can be done using the DESTDIR variable, e.g.:
$ make install DESTDIR=/tmp
This will install files to /tmp/usr/lib, /tmp/usr/include /tmp/usr/share/man.
Man pages (groff files) are generated as part of the install rule. To generate the documentation separately, run:
$ make doc
This call requires the following dependencies: pandoc. Pandoc is provided by the hs-pandoc package on FreeBSD.
Install copy of source tree can be done by specifying the path where you want it installed.
$ make source DESTDIR=some_path
For this example, it will be installed at $(DESTDIR)/pmdk.
Build rpm packages on rpm-based distributions is done by:
$ make rpm
To build rpm packages without running tests:
$ make BUILD_PACKAGE_CHECK=n rpm
This requires rpmbuild to be installed.
Build dpkg packages on Debian-based distributions is done by:
$ make dpkg
To build dpkg packages without running tests:
$ make BUILD_PACKAGE_CHECK=n dpkg
This requires devscripts to be installed.
NOTICE: Support for FreeBSD is deprecated since PMDK 1.13.0 release and will be removed in the PMDK 1.14.0 release.
You will need to install the following package to run unit tests:
- ndctl
Before running the tests, you may need to prepare a test configuration file (src/test/testconfig.sh). Please see the available configuration settings in the example file src/test/testconfig.sh.example.
To build and run the unit tests:
$ make check
To run a specific subset of tests, run for example:
$ make check TEST_TYPE=short TEST_BUILD=debug TEST_FS=pmem
To modify the timeout which is available for check type tests, run:
$ make check TEST_TIME=1m
This will set the timeout to 1 minute.
Please refer to the src/test/README for more details on how to run different types of tests.
The PMDK libraries support standard Valgrind DRD, Helgrind and Memcheck, as well as a PM-aware version of Valgrind (not yet available for FreeBSD). By default, support for all tools is enabled. If you wish to disable it, supply the compiler with VG_<TOOL>_ENABLED flag set to 0, for example:
$ make EXTRA_CFLAGS=-DVG_MEMCHECK_ENABLED=0
VALGRIND_ENABLED flag, when set to 0, disables all Valgrind tools (drd, helgrind, memcheck and pmemcheck).
The SANITIZE flag allows the libraries to be tested with various sanitizers. For example, to test the libraries with AddressSanitizer and UndefinedBehaviorSanitizer, run:
$ make SANITIZE=address,undefined clobber check
To enable logging of debug information, use debug version of a library and set
desired log level using (library-specific) variable, e.g. PMEM_LOG_LEVEL=<level>.
For more details see appropriate manpage (debbuging section), e.g. libpmem(7).
Some components in the source tree are treated as experimental. By default, those components are built but not installed (and thus not included in packages).
If you want to build/install experimental packages run:
$ make EXPERIMENTAL=y [install,rpm,dpkg]
There is an initial support for 64-bit ARM and RISC-V processors provided. While PMDK's internal testsuite passes on DRAM-only systems, support for neither of these architectures has been validated on any persistent memory hardware, nor has the code received review from any person with professional knowledge of either of these platforms.
Thus, these architectures should not be used in a production environment.
PowerPC support is ppc64le only and includes all libraries. They should build and pass all tests.
The on-media pool layout is tightly attached to the page size of 64KiB used by default on ppc64le, so it is not interchangeable with different page sizes, includes those on other architectures. For more information on this port, contact Rajalakshmi Srinivasaraghavan ([email protected]) or Lucas Magalhães ([email protected]).
For more information on this library, contact Piotr Balcer ([email protected]), Andy Rudoff ([email protected]), or post to our Google group.