emucxl: an emulation framework for CXL-based disaggregated memory applications
arxiv(2024)
摘要
The emergence of CXL (Compute Express Link) promises to transform the status
of interconnects between host and devices and in turn impact the design of all
software layers. With its low overhead, low latency, and memory coherency
capabilities, CXL has the potential to improve the performance of existing
devices while making viable new operational use cases (e.g., disaggregated
memory pools, cache coherent memory across devices etc.). The focus of this
work is design of applications and middleware with use of CXL for supporting
disaggregated memory. A vital building block for solutions in this space is the
availability of a standard CXL hardware and software platform. Currently, CXL
devices are not commercially available, and researchers often rely on
custom-built hardware or emulation techniques and/or use customized software
interfaces and abstractions. These techniques do not provide a standard usage
model and abstraction layer for CXL usage, and developers and researchers have
to reinvent the CXL setup to design and test their solutions, our work aims to
provide a standardized view of the CXL emulation platform and the software
interfaces and abstractions for disaggregated memory. This standardization is
designed and implemented as a user space library, emucxl and is available as a
virtual appliance. The library provides a user space API and is coupled with a
NUMA-based CXL emulation backend. Further, we demonstrate usage of the
standardized API for different use cases relying on disaggregated memory and
show that generalized functionality can be built using the open source emucxl
library.
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