Persistent Memory Module
What is a Persistant Memory Module?
Persistent memory (PMEM) is a solid-state high-performance byte-addressable memory device that resides on the memory bus. Being on the memory bus allows PMEM to have DRAM-like access to data, which means that it has nearly the same speed and latency of DRAM and the nonvolatility of NAND flash. NVDIMM (nonvolatile dual in-line memory module) and Intel 3D XPoint DIMMs (also known as Optane DC persistent memory modules) are two examples of persistent memory technologies.
The main advantages of persistent memory include:
- :: Provides access latencies less than those of flash SSDs.
- :: Increases throughput more than flash storage.
- :: Cheaper than DRAM.
- :: PMEM is cacheable. This is a huge advantage over PCIe interconnect, which cannot be cached in the CPU.
- :: Real-time access to data; allows ultrafast access to large datasets.
- :: Data persists in memory after power interruption, like flash.
Their use cases:-
Persistent memory can be used in a variety of ways to deliver lower latency for applications, such as:
- :: Fraud detection. Persistent memory improves the speed at which financial institutions and insurance companies can perform data analytics on millions of records to detect fraudulent transactions, preventing financial loses and impact on brand name.
- :: Cyberthreat analysis. Persistent memory allows companies to move quickly to detect and defend against increasing cyberthreats.
- :: Web-scale personalization. Persistent memory allows companies to tailor online experiences to the user by returning relevant content and advertisements to the user, resulting in higher user click-through and more e-commerce revenue opportunity.
- :: Financial trading. Financial trading applications can use persistent memory to rapidly process and execute financial transactions, allowing them to gain a competitive advantage and create higher revenue opportunity.
- :: Internet of Things (IoT). Faster processing of huge datasets in real time reduces time to value.
Persistent memory vs. NVRAM
Nonvolatile random-access memory (NVRAM) is random-access memory that retains its information even if there is no power. If power is lost before the data is written to disk, you don’t lose the data because it can be recovered from NVRAM.
NVRAM uses battery backup to keep data persistent. During this time it can flash the data out to a flash device that is attached directly. In most cases, NVRAM resides on the PCIe bus.
PMEM or NVDIMM-N can also be backed up by battery. It resides only on the memory bus.
Figure 1: A simple comparison between the form-factor memory modules; DDR4 and Optane
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