matej21

Aurora PostgreSQL 16.15 / 17.11 / 18.6: idle connections use 2× memory, and new connections use 3× CPU

This is a report of isolated tests on new, empty Amazon Aurora PostgreSQL clusters, run on 2026-10-22 in eu-west-1.

Summary

The engine release of 2026-09-29 (16.15, 17.11, 18.6) changes the cost of each client connection compared with the previous minor versions:

• Memory: each idle connection costs about 3.5–4 MiB more.
• The memory is allocated when the backend starts and stays in use until the backend exits.

matej21

name	where-are-we
description	Give the current standing of the whole task or milestone — a short summary of what is being built, an honest assessment of what actually works, and what happens next and who does it. Counters both the reflex to declare success and the habit of stopping without saying what is still missing.

Report where the work stands: what it is, what is real, what comes next. Counter the reflex to declare success, and never end without saying what is still missing.

Scope is the whole task or milestone under way — not only the last edit. If the session covers several separate tasks, say which one this is about.

First

matej21

#!/usr/bin/env bash
# cpu-lease — cooperative CPU reservation broker for concurrent agents.
#
# Model: leases come out of a fixed pool of whole SMT pairs. Every lease is a
# transient scope under leases.slice; the slices that hold unleased work are
# narrowed to the complement of what's leased. They are cgroup siblings of
# leases.slice on purpose — cpuset is hierarchical, so a lease nested inside a
# narrowed slice could never exceed it.
#
# Requires cpuset delegated to the user manager; see `cpu-lease install`.

matej21

#!/usr/bin/env bash
# cpu-lease — cooperative CPU reservation broker for concurrent agents.
#
# Model: leases come out of a fixed pool of whole SMT pairs. Every lease is a
# transient scope under leases.slice; the slices that hold unleased work are
# narrowed to the complement of what's leased. They are cgroup siblings of
# leases.slice on purpose — cpuset is hierarchical, so a lease nested inside a
# narrowed slice could never exceed it.
#
# Requires cpuset delegated to the user manager; see `cpu-lease install`.

matej21

curl -X POST \
  "https://api.cloudflare.com/client/v4/accounts/{account_id}/workers/durable-objects/namespaces/{namespace_id}/query" \
  -H "Authorization: Bearer <token>" \
  -H "content-type: application/json" \
  --data-raw '{
    "queries": [{"sql": "select * from event_log"}],
    "durable_object_id": "<do_id>"
  }'

matej21

	<?php
	protected function resetPersistentParameters($args)
	{
		$rc = new Nette\Application\UI\PresenterComponentReflection($this);
		$propertyValues = $rc->getDefaultProperties();
		foreach ($rc->getPersistentParams() as $param => $def) {
			if (!array_key_exists($param, $args) && array_key_exists($param, $propertyValues)) {
				$args[$param] = $propertyValues[$param];
			}
		}

matej21

<?php declare(strict_types = 1);

namespace AppTests\PhpStan\NextrasOrm;

use Nextras\Orm\Entity\Entity;
use PhpParser\Node;
use PhpParser\Node\Expr\MethodCall;
use PHPStan\Analyser\Scope;
use PHPStan\Broker\Broker;
use PHPStan\Rules\Rule;

matej21

<?php declare(strict_types = 1);

namespace App\Core\Latte;

use App\ImplementationException;
use Latte\Compiler;
use Latte\MacroNode;
use Latte\Macros\MacroSet;
use Latte\PhpWriter;

matej21

<?php declare(strict_types = 1);

namespace App\Core\Orm;

use MabeEnum\Enum;
use Nextras\Orm\Entity\IEntity;
use Nextras\Orm\Entity\IPropertyContainer;
use Nextras\Orm\Entity\Reflection\PropertyMetadata;

matej21

<?php

$a = 1;
var_dump($a); //prints 2