Focusing on Linux C networking, I would like to ask for advice on job selection.

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What universities teach nowadays is somewhat disconnected from industry demands. Enterprises work on practical, concrete projects. What you have learned is mostly technical fundamentals. Besides technical skills, you also need to grasp business knowledge to land a job. Here are several trending fields for your reference: 1. Robotics 2. Chip development 3. New energy vehicles … Read more

Summary of Go Context Usage Specifications: Key Points for Timeout Propagation and Cancellation Signal Handling

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Our team enforces three hard rules for code reviews: First, `ctx` is always the first parameter and must not be stored as a struct field. Storing request-scoped values inside long-lived objects breaks cancellation signals. Use `WithCancelCause` in Go 1.21+ to carry cancellation reasons; on-call engineers will appreciate this during troubleshooting. Second, whoever calls `WithTimeout` must … Read more

Spring Cloud Config Refresh Practices: Encryption, Decryption and Repository Permission Configuration

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When it comes to configuration refresh, the most frequent pitfall is “configuration changes not taking effect”. Follow this recommended troubleshooting sequence: 1. Verify the refresh pipeline First confirm whether `/actuator/refresh` is actually invoked (check actuator logs or add an interceptor for tracing). A common mistake is failing to expose the refresh endpoint via `management.endpoints.web.exposure.include`, or … Read more

Analysis and Mitigation of Kafka Message Loss Scenarios: acks Configuration and Idempotent Producer Practices

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Starting troubleshooting from “where the loss occurs” is more effective than discussing `acks` in general terms. It is recommended to locate issues by segmenting the pipeline: 1. Producer side: First verify whether it is a “false success” When `acks=0`, a successful `send()` response does not mean the broker has received the message. With `acks=1`, the … Read more

Tuning PostgreSQL Connection Pool Configuration: Analysis of Max Connections and Idle Reclamation Parameters

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A common misconception about PG needs correcting first: `max_connections` is not better when set higher. Each PostgreSQL connection is a separate process. Even two or three hundred active connections can tank throughput purely due to context switching. It is not uncommon to see slower performance after raising it to 2000. For the application side, HikariCP’s … Read more

Why is the calculated capacitive contribution k-value consistently 99% for scan rates from 5 mV s⁻¹ to 30 mV s⁻¹?

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A calculated capacitive contribution of 99% at low scan rates almost certainly stems from flaws in the fitting procedure or data selection, rather than the material truly exhibiting near-pure capacitive behavior. The Dunn method is extremely sensitive to data quality at low scan rates, and a common systematic error can artificially inflate the result to … Read more

What should be done for the underlying safety safeguards when a large-model Agent connects to physical hardware?

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Large models (including various Agent frameworks) are growing increasingly capable. However, once they interface with the physical world — for example, controlling robotic arms or autonomous vehicles — safety safeguards implemented purely in software become extremely fragile. If the large model hallucinates, or falls victim to prompt injection attacks, it may bypass safety checks embedded … Read more

Why can’t the main process read the latest values after child processes write to a shared cache created with `Manager().dict()` in Python multiprocessing?

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I’m building a small tool for batch processing tasks. The main process spins up multiple workers using `multiprocessing.Pool`. I want each worker to write its processing results into a shared dictionary, so the main process can aggregate everything at the end. But after execution, when the main process prints this dictionary, it is still empty … Read more