From 11eb89e45c8a6d4a5b07134b8957a1298f9305c8 Mon Sep 17 00:00:00 2001
From: Anthony Lukach <anthonylukach@gmail.com>
Date: Wed, 2 Nov 2022 20:52:54 -0700
Subject: [PATCH] feat(stac-db): Provide sensible defaults for pgSTAC db
 parameters (#1)

---
 lib/database/index.ts             | 104 +++++-
 lib/database/instance-memory.json | 525 ++++++++++++++++++++++++++++++
 2 files changed, 626 insertions(+), 3 deletions(-)
 create mode 100644 lib/database/instance-memory.json

diff --git a/lib/database/index.ts b/lib/database/index.ts
index 214436d..429e83d 100644
--- a/lib/database/index.ts
+++ b/lib/database/index.ts
@@ -6,6 +6,8 @@ import {
 import { Construct } from "constructs";
 import { BootstrapPgStac, BootstrapPgStacProps } from "../bootstrapper";
 
+const instanceSizes: Record<string, number> = require("./instance-memory.json");
+
 /**
  * An RDS instance with pgSTAC installed. This is a wrapper around the
  * `rds.DatabaseInstance` higher-level construct making use
@@ -18,12 +20,22 @@ export class PgStacDatabase extends Construct {
   constructor(scope: Construct, id: string, props: PgStacDatabaseProps) {
     super(scope, id);
 
+    const defaultParameters = this.getParameters(
+      props.instanceType?.toString() || "m5.large",
+      props.parameters
+    );
     const parameterGroup = new rds.ParameterGroup(this, "parameterGroup", {
       engine: props.engine,
       parameters: {
-        max_locks_per_transaction: "1024",
-        work_mem: "64000",
-        temp_buffers: "32000",
+        shared_buffers: defaultParameters.sharedBuffers,
+        effective_cache_size: defaultParameters.effectiveCacheSize,
+        work_mem: defaultParameters.workMem,
+        maintenance_work_mem: defaultParameters.maintenanceWorkMem,
+        max_locks_per_transaction: defaultParameters.maxLocksPerTransaction,
+        temp_buffers: defaultParameters.tempBuffers,
+        seq_page_cost: defaultParameters.seqPageCost,
+        random_page_cost: defaultParameters.randomPageCost,
+        ...props.parameters,
       },
     });
 
@@ -45,6 +57,45 @@ export class PgStacDatabase extends Construct {
 
     this.pgstacSecret = bootstrap.secret;
   }
+
+  public getParameters(
+    instanceType: string,
+    parameters: PgStacDatabaseProps["parameters"]
+  ): DatabaseParameters {
+    // https://github.com/aws/aws-cli/issues/1279#issuecomment-909318236
+    const memory_in_kb = instanceSizes[instanceType] * 1024;
+
+    // It's only necessary to consider passed in parameters for any value that used to
+    // derive subsequent values. Values that don't have dependencies will be overriden
+    // when we unpack the passed-in user parameters
+    const maxConnections = parameters?.maxConnections
+      ? Number.parseInt(parameters.maxConnections)
+      : // https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/CHAP_Limits.html#RDS_Limits.MaxConnections
+        Math.min(Math.round((memory_in_kb * 1024) / 9531392), 5000);
+    const sharedBuffers = parameters?.sharedBufers
+      ? Number.parseInt(parameters.sharedBufers)
+      : Math.round(0.25 * memory_in_kb);
+
+    const effectiveCacheSize = Math.round(0.75 * memory_in_kb);
+    const workMem = Math.floor(sharedBuffers / maxConnections);
+    const maintenanceWorkMem = Math.round(0.25 * sharedBuffers);
+
+    const tempBuffers = 128 * 1024;
+    const seqPageCost = 1;
+    const randomPageCost = 1.1;
+
+    return {
+      maxConnections: `${maxConnections}`,
+      sharedBuffers: `${sharedBuffers}`,
+      effectiveCacheSize: `${effectiveCacheSize}`,
+      workMem: `${workMem}`,
+      maintenanceWorkMem: `${maintenanceWorkMem}`,
+      maxLocksPerTransaction: "1024",
+      tempBuffers: `${tempBuffers}`,
+      seqPageCost: `${seqPageCost}`,
+      randomPageCost: `${randomPageCost}`,
+    };
+  }
 }
 
 export interface PgStacDatabaseProps extends rds.DatabaseInstanceProps {
@@ -53,3 +104,50 @@ export interface PgStacDatabaseProps extends rds.DatabaseInstanceProps {
   readonly pgstacUsername?: BootstrapPgStacProps["pgstacUsername"];
   readonly secretsPrefix?: BootstrapPgStacProps["secretsPrefix"];
 }
+
+export interface DatabaseParameters {
+  /**
+   * @default - LEAST({DBInstanceClassMemory/9531392}, 5000)
+   */
+  readonly maxConnections: string;
+
+  /**
+   * @default - 25% of instance memory
+   */
+  readonly sharedBuffers: string;
+
+  /**
+   * @default - 75% of instance memory
+   */
+  readonly effectiveCacheSize: string;
+
+  /**
+   * @default - shared buffers divided by max connections
+   */
+  readonly workMem: string;
+
+  /**
+   * @default - 25% of shared buffers
+   */
+  readonly maintenanceWorkMem: string;
+
+  /**
+   * @default 1024
+   */
+  readonly maxLocksPerTransaction: string;
+
+  /**
+   * @default 131172 (128 * 1024)
+   */
+  readonly tempBuffers: string;
+
+  /**
+   * @default 1
+   */
+  readonly seqPageCost: string;
+
+  /**
+   * @default 1.1
+   */
+  readonly randomPageCost: string;
+}
diff --git a/lib/database/instance-memory.json b/lib/database/instance-memory.json
new file mode 100644
index 0000000..a9be844
--- /dev/null
+++ b/lib/database/instance-memory.json
@@ -0,0 +1,525 @@
+{
+  "c6g.16xlarge": 131072,
+  "x2gd.metal": 1048576,
+  "c6a.16xlarge": 131072,
+  "c5ad.12xlarge": 98304,
+  "r6a.metal": 1572864,
+  "is4gen.4xlarge": 98304,
+  "m6gd.xlarge": 16384,
+  "m6gd.4xlarge": 65536,
+  "d3en.2xlarge": 32768,
+  "c7g.8xlarge": 65536,
+  "x2gd.8xlarge": 524288,
+  "m6a.2xlarge": 32768,
+  "d2.8xlarge": 249856,
+  "i3en.3xlarge": 98304,
+  "r6a.2xlarge": 65536,
+  "r6a.xlarge": 32768,
+  "m5dn.large": 8192,
+  "m5a.4xlarge": 65536,
+  "c6gd.metal": 131072,
+  "m6id.2xlarge": 32768,
+  "r5dn.8xlarge": 262144,
+  "r5a.xlarge": 32768,
+  "x2iedn.2xlarge": 262144,
+  "c5ad.24xlarge": 196608,
+  "m5zn.6xlarge": 98304,
+  "r6g.medium": 8192,
+  "im4gn.2xlarge": 32768,
+  "t4g.nano": 512,
+  "r6g.large": 16384,
+  "t2.2xlarge": 32768,
+  "c5ad.4xlarge": 32768,
+  "m4.4xlarge": 65536,
+  "c6id.8xlarge": 65536,
+  "r5n.12xlarge": 393216,
+  "g3.16xlarge": 499712,
+  "r6id.16xlarge": 524288,
+  "c6a.48xlarge": 393216,
+  "m5a.2xlarge": 32768,
+  "g5.4xlarge": 65536,
+  "m5n.16xlarge": 262144,
+  "r6gd.xlarge": 32768,
+  "c5d.large": 4096,
+  "m6id.xlarge": 16384,
+  "x2iezn.4xlarge": 524288,
+  "i4i.16xlarge": 524288,
+  "c4.4xlarge": 30720,
+  "m5dn.2xlarge": 32768,
+  "r6i.xlarge": 32768,
+  "m5ad.12xlarge": 196608,
+  "m6gd.12xlarge": 196608,
+  "m5a.16xlarge": 262144,
+  "i3en.12xlarge": 393216,
+  "c6i.2xlarge": 16384,
+  "trn1.32xlarge": 524288,
+  "m6id.12xlarge": 196608,
+  "r6gd.medium": 8192,
+  "m5d.8xlarge": 131072,
+  "m5dn.12xlarge": 196608,
+  "r4.16xlarge": 499712,
+  "z1d.2xlarge": 65536,
+  "r6id.xlarge": 32768,
+  "r5.24xlarge": 786432,
+  "is4gen.xlarge": 24576,
+  "x1e.8xlarge": 999424,
+  "c6gn.16xlarge": 131072,
+  "m6a.large": 8192,
+  "r6id.2xlarge": 65536,
+  "r6g.16xlarge": 524288,
+  "r6g.8xlarge": 262144,
+  "c6i.32xlarge": 262144,
+  "r5ad.24xlarge": 786432,
+  "c6i.large": 4096,
+  "c5n.2xlarge": 21504,
+  "c6a.24xlarge": 196608,
+  "im4gn.8xlarge": 131072,
+  "x1e.2xlarge": 249856,
+  "r6gd.2xlarge": 65536,
+  "i3en.24xlarge": 786432,
+  "m6i.large": 8192,
+  "c4.8xlarge": 61440,
+  "m5zn.large": 8192,
+  "x1e.32xlarge": 3997696,
+  "c6i.8xlarge": 65536,
+  "m5zn.2xlarge": 32768,
+  "r5a.2xlarge": 65536,
+  "x2iedn.xlarge": 131072,
+  "g5.2xlarge": 32768,
+  "m6gd.medium": 4096,
+  "m5d.xlarge": 16384,
+  "f1.2xlarge": 124928,
+  "d3en.8xlarge": 131072,
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+  "c6i.4xlarge": 32768,
+  "x1.16xlarge": 999424,
+  "m4.xlarge": 16384,
+  "r5.large": 16384,
+  "c5d.12xlarge": 98304,
+  "g4dn.12xlarge": 196608,
+  "m6g.xlarge": 16384,
+  "m6i.24xlarge": 393216,
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+  "r5a.16xlarge": 524288,
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+  "c7g.4xlarge": 32768,
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+  "i3.2xlarge": 62464,
+  "inf1.24xlarge": 196608,
+  "c6gn.large": 4096,
+  "x2iedn.32xlarge": 4194304,
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