84 lines
3.3 KiB
Diff
84 lines
3.3 KiB
Diff
From 780a5e80311f5f3d188666733dcf276abc8e7e81 Mon Sep 17 00:00:00 2001
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From: vegbir <yangjiaqi16@huawei.com>
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Date: Wed, 14 Jun 2023 17:14:16 +0800
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Subject: [PATCH 05/13] rubik: move fssr design document to design dir
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Signed-off-by: vegbir <yangjiaqi16@huawei.com>
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---
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docs/{ => design}/fssr.md | 18 ++++++++++++++----
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.../fssr/flowchart.png} | Bin
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.../fssr/sequence_diagram.png} | Bin
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3 files changed, 14 insertions(+), 4 deletions(-)
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rename docs/{ => design}/fssr.md (90%)
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rename docs/{png/rubik_fssr_2.png => images/fssr/flowchart.png} (100%)
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rename docs/{png/rubik_fssr_1.png => images/fssr/sequence_diagram.png} (100%)
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diff --git a/docs/fssr.md b/docs/design/fssr.md
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similarity index 90%
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rename from docs/fssr.md
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rename to docs/design/fssr.md
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index 3fb36bd..184b364 100644
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--- a/docs/fssr.md
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+++ b/docs/design/fssr.md
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@@ -1,20 +1,27 @@
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+# 【需求设计】异步内存分级回收 fssr策略
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+
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## 方案目标
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+
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在混部集群中，在线和离线业务被同时部署到同一物理资源（节点）上，同时离线业务是内存资源消耗型，在线业务有波峰波谷，在离线业务之间内存资源竞争导致在线业务受影响。该方案目标在充分利用内存资源的同时保证在线QoS。
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## 总体设计
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+
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各个模块之间的联系如下：
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-
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+
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- 用户部署rubik，rubik向k8s注册监听pod事件。
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- 当离线业务被部署时k8s会通知rubik，rubik向该离线pod配置memory.high。
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- 同时rubik实时监控当前节点的内存使用量，使用fssr策略向pod配置memory.high。
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### 依赖说明
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+
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内核需要支持memcg级内存水位线方案，即提供`memory.high`和`memory.high_async_ratio`。
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### 详细设计
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+
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内存分级方案中，rubik新增FSSR内存处理模块，该模块主要处理获取主机（节点）的总内存(total memory)、预留内存(reserved memory)、剩余内存(free memory)。并根据FSSR算法设置离线内存的memory.high。具体策略如下：
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-
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+
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+
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- rubik启动时计算预留内存，默认为总内存的10%，如果总内存的10%超过10G，则为10G
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- 配置离线容器的cgroup级别水位线，内核提供`memory.high`和`memory.high_async_ratio`两个接口，分别配置cgroup的软上限和警戒水位线。启动rubik时默认配置`memory.high`为`total_memory`(总内存)`*`80%
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- 获取剩余内存free_memory
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@@ -22,13 +29,16 @@
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- 持续一分钟free_memory>2`*`reserved_memory时提高离线的memory.high，每次提升总内存的1%，total_memory`*`1%
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说明：
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+
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1. 离线应用memory.high的范围为`[total_memory*30%, total_memory*80%]`
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### 配置说明
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-```
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+
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+```json
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"dynMemory": {
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"policy": "fssr"
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}
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```
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+
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- dynMemory表示动态内存
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-- policy目前只支持fssr
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\ No newline at end of file
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+- policy目前只支持fssr
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diff --git a/docs/png/rubik_fssr_2.png b/docs/images/fssr/flowchart.png
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similarity index 100%
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rename from docs/png/rubik_fssr_2.png
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rename to docs/images/fssr/flowchart.png
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diff --git a/docs/png/rubik_fssr_1.png b/docs/images/fssr/sequence_diagram.png
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similarity index 100%
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rename from docs/png/rubik_fssr_1.png
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rename to docs/images/fssr/sequence_diagram.png
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--
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2.41.0
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