pmem.io

What It Is

PMem.io is an open-source community and developer resource site centered on Persistent Memory. It explains persistent memory as a third tier of media between memory and storage, and provides the Persistent Memory Development Kit (PMDK) as its core development toolkit, helping developers directly leverage byte-addressable data access that persists through power loss in their applications.

Core Capabilities

PMDK is the site’s main focus. The text describes it as a set of open-source libraries designed for different use cases, tuned and validated with stable APIs, with the goal of allowing developers to integrate PMem functionality without worrying about hardware implementation details. Developer resources also include the pmemkv embedded key-value store, the Java low-level persistent memory library LLPL, Java persistent collections PCJ, as well as extensive tutorials, sample code, API documentation, webinars, and forums. The tooling ecosystem covers daxctl, ipmctl, ndctl, pmemcheck, pmembench, pmempool, VTune, Linux Perf/eBPF, FIO, Valgrind, and more, for device management, debugging, performance analysis, benchmarking, and monitoring.

Pricing and Open Source

The site and PMDK are clearly positioned as open-source projects. Learning resources and the ebook Programming Persistent Memory are also available for free, with English, Simplified Chinese, and Korean versions. Note that PMem.io also showcases third-party ecosystem projects, including both open-source products and paid or free products, which do not constitute official endorsements.

Pros and Cons

Its strengths are that it concentrates resources in a vertical domain, covering the full path from beginner learning to production-grade libraries, debugging, and performance analysis. PMDK provides stable APIs, making it suitable for building databases, storage systems, and memory-tiering solutions. Its drawbacks are the high domain barrier and dependency on persistent memory hardware. Without real devices, it can be emulated on Linux/KVM using DRAM or disk, but this is not suitable for performance benchmarking. The site also notes that some documentation is only maintained up to PMDK 1.13.1, and that after version 2.0, the GitHub repository is the definitive source of information.

Who It’s For and Access from China

It is suitable for system software, database, infrastructure, DevOps, and hardware-related development teams, but not for typical web or mobile development. The text does not provide information on access from China, so this is considered unknown.