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High-performance distributed key-value cache

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🔄Latest News

  • [2025/12] MemCache已作为vllm-ascend backend使能大模型推理加速,详情查看vllm-ascend开源社区,使用示例

  • [2025/11] MemCache项目于2025年11月开源,开源社区地址为:https://gitcode.com/Ascend/memcache

🔜 Roadmap

MemCache roadmap和版本分支策略详见: Roadmap

🎉概述

MemCache是针对LLM推理、GR推理场景设计的高性能分布式KVCache存储引擎,其主要特性包括:

  • 基于对象操作的API:支持批量和非批量的put/get/exist/remove操作,支持多层结构的KV Block读写接口。
  • 支持多副本:单个对象支持多副本放置到不同的LocalService,默认是单副本,支持put接口指定副本数量。
  • 高带宽低时延:使用 MemFabric 作为多级内存和异构网络传输的底座,在Ascend硬件上,基于device_rdma(A2)、device_sdma(A3)、host_rdma(A2/A3) 等路径提供OneCopy跨机跨介质数据直接访问能力,满足高带宽,低时延的读写性能述求。在鲲鹏硬件上,支持host_urma(K5)。支持host_shm实现同节点共享内存通信。
  • 支持扩缩容:支持LocalService动态加入和移除
  • HA能力:在K8S集群中,MetaService支持多活能力,支持元数据恢复,提供尽力而为的HA能力。
architecture

🧩核心组件

MemCache包含LocalService和MetaService两大核心组件:

  • MetaService

    • 负责管理整个集群中内存池空间的分配和管理,处理LocalService的加入与退出。
    • MetaService作为独立进程运行,提供两种启动方式:python API启动;二进制启动,详见 安装部署
    • MetaService支持两种部署形态: 1、单点模式:MetaService由单个进程组成,部署方式简单,但存在单点故障的问题。如果MetaService进程崩溃或无法访问,系统将无法继续提供服务,直至重新恢复为止。 2、HA模式:该模式基于K8S的的ClusterIP Service和Lease资源构建,部署较为复杂,该模式会部署多个MetaService进程实例,实现多活高可用。部署详见 MetaService HA
  • LocalService:负责承担如下功能:

    • 客户端:作为客户端,以whl/so形式作为共享库被应用进程加载调用API
    • 内存提供者:负责提供一段连续的内存区域作为内存池空间的一部分,其内存可以被其他LocalService实例基于地址直接访问。

🔥性能表现

MemCache核心能力是提供大容量内存池和高性能的H2D、D2H、D2RH、RH2D数据访问能力,由于MemCache以 MemFabric 作为池化底座,所以支持RH2D、D2RH等OneCopy跨机跨介质数据直接访问能力,下图为RH2D对比其他中转路径的对比示意图。

RH2D

基于OneCopy跨机跨介质数据直接访问的能力,MemCache在A2/A3做了相关性能测试如下: 模拟构造DeepSeek-R1模型KV大小的block,单个block size为:61x128K + 61x16K = 8784KB ≈ 8.57MB,共122个离散地址。

  • 使用2个昇腾A2节点(每节点8张卡)组成双机内存池进行读写测试性能如下:
A2 perf
  • 使用2个昇腾A3节点(每节点8张卡16Die)组成双机内存池进行读写测试性能如下:
A3 perf

🔍目录结构

├── LICENSE                                 # LICENSE
├── .clang-format                           # 格式化配置
├── .gitmodules                             # git配置
├── .gitignore                              # git忽视配置文件
├── CMakeLists.txt                          # 项目的CMakeList
├── doc                                     # 文档目录
├── example                                 # 样例
│  ├── cpp                                  # c++样例
│  └── python                               # python样例
├── script                                  # 构建脚本
│  ├── build_and_pack_run.sh                # 编译+打包脚本
│  ├── build.sh                             # 编译脚本
│  ├── run_ut.sh                            # 编译+运行ut脚本
├── test                                    # test目录
│  ├── python                               # python测试用例
│  ├── k8s_deploy                           # k8s ha样例脚本
│  └── ut                                   # 单元测试用例
├── src                                     # 源码
│  ├── memcache                             # MemCache 源码
├── config                                  # 配置目录
│  ├── mmc-local.conf                       # 本地服务配置文件模板
│  ├── mmc-meta.conf                        # meta服务配置文件模板
├── README.md

🚀快速入门

请访问以下文档获取简易教程。

  • 编译部署:介绍组件编译和安装教程。
  • 配置文件:涉及MetaService、LocalService公共配置
  • 样例执行:介绍如何端到端执行样例代码,包括C++和Python样例。
  • [最佳实践]:推出中...

📑学习教程

  • c++接口:C++接口介绍以及C++接口对应的API列表
  • python接口:python接口介绍以及python接口对应的API列表

📦软件硬件配套说明

  • MemCache软件依赖 MemFabric,相关配套与MemFabric相同

📌FAQ

常见问题请参考:FAQ

📝相关信息

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