USENIX supports diversity, equity, and inclusion and condemns hate and discrimination.
Good Old-Fashioned Persistent Memory
;login: Enters a New Phase of Its Evolution
For over 20 years, ;login: has been a print magazine with a digital version; in the two decades previous, it was USENIX’s newsletter, UNIX News. Since its inception 45 years ago, it has served as a medium through which the USENIX community learns about useful tools, research, and events from one another. Beginning in 2021, ;login: will no longer be the formally published print magazine as we’ve known it most recently, but rather reimagined as a digital publication with increased opportunities for interactivity among authors and readers.
Since USENIX became an open access publisher of papers in 2008, ;login: has remained our only content behind a membership paywall. In keeping with our commitment to open access, all ;login: content will be open to everyone when we make this change. However, only USENIX members at the sustainer level or higher, as well as student members, will have exclusive access to the interactivity options. Rik Farrow, the current editor of the magazine, will continue to provide leadership for the overall content offered in ;login:, which will be released via our website on a regular basis throughout the year.
As we plan to launch this new format, we are forming an editorial committee of volunteers from throughout the USENIX community to curate content, meaning that this will be a formally peer-reviewed publication. This new model will increase opportunities for the community to contribute to ;login: and engage with its content. In addition to written articles, we are open to other ideas of what you might want to experience.
![](https://www.usenix.org/sites/default/files/1904_cover_170x221_3.png)
Given the excitement surrounding commercially available byte-addressable non-volatile memory (NVM), now is a good time to remind ourselves that it has long been possible to implement a software abstraction of persistent memory on conventional hardware—ordinary volatile DRAM and block-addressed storage devices. The corresponding "persistent memory style of programming" offers many of the same attractions as NVM programming but doesn't require special NVM hardware. This article illustrates persistent memory programming on conventional hardware with working C code for UNIX-like operating systems. The right crash consistency mechanism for persistent memory programming on conventional hardware is failure-atomic msync() (FAMS), and this article presents a concise new implementation of FAMS.