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Userspace implementation of file APIs using persistent memory.
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debian Add FUSE driver using libpmemfile-posix. Sep 19, 2017
doc doc: Minor fixes in Oct 4, 2017
src posix: better error message when there's ref leak Nov 17, 2017
tests tests: update "match" to the latest version Nov 2, 2017
utils common: fix Coverity patch path May 14, 2018
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CMakeLists.txt libpmemfile-pop - a library which translates libpmemfile-posix functi… Oct 13, 2017
ChangeLog Make it build! Feb 16, 2017
LICENSE Mention origin of Apr 21, 2017 libpmemfile-pop - a library which translates libpmemfile-posix functi… Oct 13, 2017 antool: add fcntl's F_SETFL(0x04) flag to unsupported ones Sep 28, 2017 Mention origin of Apr 21, 2017
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Pmemfile project's goal is to provide low-overhead userspace implementation of file APIs using persistent memory. It consists of 2 major compoments:

  • libpmemfile-posix - provides syscall-like API which can be used by applications
  • libpmemfile - provides transparent access to libpmemfile-posix pools

How to build


$ mkdir build
$ cd build
$ cmake .. -DCMAKE_INSTALL_PREFIX=/usr
$ make
$ make install

When developing:

$ ...
$ cmake .. -DCMAKE_BUILD_TYPE=Debug -DDEVELOPER_MODE=1 -DTEST_DIR=/mnt/pmem/pmemfile-tests
$ ...
$ ctest --output-on-failure

Note that in Debug mode "make install" installs only debug libraries.

Pmemfile-specific cmake variables:

  • BUILD_LIBPMEMFILE=0 - disables building of
  • BUILD_LIBPMEMFILE_POP=1 - builds tests using with libpmemfile-posix-over-POSIX library which imitates, but uses POSIX functions provided by OS
  • DEVELOPER_MODE=1 - enables coding style, whitespace, license checks and enables fail-on-warning flags
  • LONG_TESTS=1 - enables tests which take much more time
  • TEST_DIR=/mnt/pmem/test_dir - provides directory where tests will create its pools
  • TRACE_TESTS=1 - dumps more info when test fails (requires cmake >= 3.4)
  • TESTS_USE_FORCED_PMEM=1 - allows tests to force enable or force disable use of optimized flush in libpmemobj (to speed them up)
  • USE_ASAN=1 - enables AddressSanitizer (only for debugging)
  • USE_UBSAN=1 - enables UndefinedBehaviorSanitizer (only for debugging)

Package for Debian-based distros

$ ./utils/

Resulting packages will be in ./build-deb/release and ./build-deb/debug

Package for RPM-based distros

$ ./utils/

Resulting packages will be in ~/rpmbuild/RPMS.

Note: Before 1.0 pmemfile-posix API and ABI is considered unstable. We reserve the right to change the on-media layout without warning.



$ mkfs.pmemfile /dev/dax0.0 0
$ mkdir /tmp/mountpoint

$ sudo pmemfile-mount /dev/dax0.0 /tmp/mountpoint
$ alias pf=''

# or if you don't have root access:

$ alias pf=' PMEMFILE_POOLS=/tmp/mountpoint:/dev/dax0.0'

# now all commands prefixed with 'pf' will see files under /tmp/mountpoint,
# but files will be stored in file system backed by /dev/dax0.0
$ pf mkdir /tmp/mountpoint/dir_in_pmemfile
$ pf cp /tmp/mountpoint/dir_in_pmemfile
$ pf ls -l /tmp/mountpoint/
total 0
drwxrwxrwx 2 user group 4008 Feb 16 17:46 dir_in_pmemfile
$ pf ls -l /tmp/mountpoint/dir_in_pmemfile
total 16
-rw-r--r-- 1 user group 1014 Feb 16 17:46
$ pf cat /tmp/mountpoint/dir_in_pmemfile/ | wc -c
# verify that files are stored in pmemfile pool:
$ ls -l /tmp/mountpoint/
total 0
$ ls -l /tmp/mountpoint/dir_in_pmemfile
ls: cannot access '/tmp/mountpoint/dir_in_pmemfile': No such file or directory


  • libpmemfile[-posix].so does not support multiple processes accessing the pool (libpmemobj limitation)
  • supports Linux only (other UNIX-like systems could be supported)
  • supports x86_64 only (libsyscall_intercept, libpmem and libpmemobj limitation)
  • is not safe with remotely replicated pool ( has no such limitation)


Environment variables:

  • INTERCEPT_LOG - log file for all intercepted syscalls (default: none)
  • INTERCEPT_LOG_TRUNC - when set to 0, the above log file is not truncated (default: 1)
  • INTERCEPT_HOOK_CMDLINE_FILTER - intercept syscalls only when process name matches this variable (used to skip gdb from intercepting) (default: empty)

  • PMEMOBJ_LOG_FILE - log file (default: none)
  • PMEMOBJ_LOG_LEVEL - logging level (default: 0)

  • PMEMFILE_POSIX_LOG_FILE - log file (default: none)
  • PMEMFILE_POSIX_LOG_LEVEL - logging level (default: 0)

  • PMEMFILE_PRELOAD_LOG - log file (default: none)
  • PMEMFILE_PRELOAD_LOG_TRUNC - when set to 0, the above log file is not truncated (default: 1)
  • PMEMFILE_EXIT_ON_NOT_SUPPORTED - when set to 1, aborts an application which uses unsupported syscall (default: 0)
  • PMEMFILE_PRELOAD_PAUSE_AT_START - pauses initialization of pmemfile until debugger is attached (default: 0)

Other variables:

  • PMEMFILE_BLOCK_SIZE - forces one block size (default: dynamic)
  • PMEMFILE_CD - performs early chdir() to specified directory, used as a workaround for missing multi-process support when application must start from pmemfile-backed directory (default: none)
  • PMEMFILE_IGNORE_INODE_FREE_ERRORS - when set to 1, disables abort() when freeing inode's metadata fails (it defers freeing to the next application start) - can be used to get out of out-of-space situations (default: 0)
  • PMEMFILE_OVERALLOCATE_ON_APPEND - when set to 0, disables allocation of more space than required (default: 1)
  • PMEMFILE_PRELOAD_PROCESS_SWITCHING - when set to 1, enables VERY slow emulation of multi-process support, used for testing pmemfile with file system test suites (default: 0)
  • PMEMFILE_PRELOAD_VALIDATE_POINTERS - when set to 1, verifies memory reaching libpmemfile through syscall arguments is accessible; it's very slow, so it should never be used in production for non-buggy applications

Other stuff

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