Community & Careers questions and discussions

Editorial question66.7K views2,356 votes1 answer3,635 following

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IntelliJ IDEA Profiler: Sampling vs Tracing overhead in JVM bottleneck analysis

When optimizing JVM applications using the integrated IntelliJ IDEA Profiler, identifying the precise cause of a performance bottleneck requires choosing between sampling and tracing modes. While sampling provides a low-overhead statistical view of execution, tracing captures every method call to provide an exact call count. The primary constraint is the per

intellij-idea

jetbrains jvm-profilingDev Dey0 rep · 03 Oct 2022, 06:47 UTC

Editorial question29.6K views3,671 votes1 answer1 comment2,184 following

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Nomad health check flapping and event stream noise

HashiCorp Nomad utilizes check stanzas to monitor task health via HTTP, TCP, or scripts. When integrated with external monitoring tools via the Event Stream API or Prometheus endpoints, these checks provide visibility into task stability. A challenge arises when tasks experience "flapping," where a health check rapidly oscillates between healthy and unhealth

event-stream health-checks monitoringAri Byte0 rep · 02 Oct 2022, 02:14 UTC

Editorial question26.2K views2,323 votes1 answer4,877 following

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Expire on Commit: Freshness vs Memory for Long-Lived SQLAlchemy Sessions

Choosing between SQLAlchemy's default expire_on_commit=True and expire_on_commit=False is a trade-off for long-running applications that keep a Session or scoped_session alive across many commits. With True, committed instances are expired, so subsequent attribute access triggers a refresh query; this preserves freshness but can increase database round-trips

expire-on-commit

sqlalchemy memory-managementRey Maple0 rep · 01 Oct 2022, 16:55 UTC

Editorial question59.1K views914 votes1 answer1 comment1,909 following

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High CPU usage when reusing Cairo image surfaces via create_similar in low‑traffic workloads

Goal: Determine if reusing a single Cairo image surface created with cairo_surface_create_similar reduces allocation overhead for workloads that draw infrequently. Constraints: The reused surface must be updated via direct pixel access or drawing calls, then marked dirty with cairo_surface_mark_dirty before each frame; cairo_surface_finish is required before

low-traffic

cairo performanceZo Atlas0 rep · 30 Sept 2022, 21:39 UTC

Editorial question43.2K views3,071 votes1 answer4,181 following

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D3 v7 ES Module Transition: Why Local Scripts Fail in Production

Goal We want to load external JSON data with d3.json in a D3 v7 application that is bundled as ES modules and served from a subpath in production. The same code works fine on a local dev server. Constraints & Uncertainty D3 v7 ships only as named ES module exports; a global d3 object is no longer available unless a UMD build is explicitly loaded. Data re

fetch cros es-modulesIra Echo0 rep · 30 Sept 2022, 22:38 UTC

Editorial question82.7K views1,341 votes1 answer1 comment1,404 following

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ProcessWire Page Edit Permission Missing Field‑Level Restriction

Desired field‑level edit control Administrators need a role that can edit pages based on a template but should be prevented from modifying certain fields, such as internal metadata or hidden fields, while still allowing edits to other fields on the same page. ProcessWire core grants edit permission at the template level, which makes all fields on a page edit

role-management

processwire permissionsIra Dey0 rep · 29 Sept 2022, 20:03 UTC

Editorial question144.6K views3,367 votes1 answer2,655 following

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Data editor pagination stability with non‑unique ORDER BY

Goal Achieve consistent row ordering when scrolling through a large result set in the PyCharm data editor while the underlying table is being modified concurrently. Constraints Page size is a global setting (Settings → Tools → Database → Data Editor → Result set page size) and cannot be overridden per query. Pagination uses offset‑based LIMIT/OFFSET queries;

data-editor database-tools paginationAri Orbit0 rep · 29 Sept 2022, 13:57 UTC

Editorial question95.3K views2,219 votes1 answer1,646 following

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-fstack-protector-strong vs -fstack-protector-all under a runtime-overhead budget

A production GCC build requires stack-buffer-overflow mitigation under a runtime-overhead budget with attention to code size and instruction-cache effects. The decision is between -fstack-protector-strong and -fstack-protector-all, where coverage is not equivalent and overhead is workload and target dependent. The build may target a custom or freestanding C

compiler-flags stack-protector hardeningKavi Echo0 rep · 29 Sept 2022, 16:16 UTC

Editorial question122.2K views913 votes1 answer1 comment4,706 following

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In-Memory Queue vs Persistent Queue: Which Is Best for Low‑Traffic Beats?

Goal Determine the most cost‑effective queue strategy for Elastic Beats when the monitored traffic is minimal. Constraints Beats provide two documented queue implementations: In‑memory queue – low CPU and disk I/O, but loses buffered events on crash. Persistent disk queue – writes events to local storage before shipping, adding durability at the expense of h

beats low-traffic elastic-beatsRin River0 rep · 29 Sept 2022, 09:25 UTC