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The unlikely Linux macro
https://www.reddit.com/r/programming/comments/1vvrbyb/the_unlikely_linux_macro/

<!-- SC_OFF -->Wrote a bit about the `unlikely` and `likely` macros in the Linux codebase. Great little exploration into tiny optimizations that everyone should know more about 😄 <!-- SC_ON --> submitted by /u/chaobang (https://www.reddit.com/user/chaobang)
[link] (https://rushed-reflections.bearblog.dev/an-unlikely-experiment/) [comments] (https://www.reddit.com/r/programming/comments/1vvrbyb/the_unlikely_linux_macro/)
Running a Java Spring Boot app on a 512 MB VPS with lightweight monitoring
https://www.reddit.com/r/programming/comments/1vxl0w4/running_a_java_spring_boot_app_on_a_512_mb_vps/

<!-- SC_OFF -->I wanted to see how a fairly representative Java Spring Boot application behaves on a very small VPS, especially the difference between configured heap and actual JVM process memory. The test app uses Spring Boot 3.5.x, Spring MVC, JPA/Hibernate, H2, embedded Tomcat, Actuator, scheduled work, and outbound HTTP. I also kept lightweight monitoring on the same machine. The original 256 MB configuration was too tight. With 512 MB RAM + 256 MB swap, the application completed the test reliably. Full setup and measurements are in the linked article. Since then I’ve also managed to get the same application working on a 256 MB VPS with swap using JDK 25 Compact Object Headers and tighter JVM settings. I’m preparing that as a separate follow-up experiment. <!-- SC_ON --> submitted by /u/fykup (https://www.reddit.com/user/fykup)
[link] (https://pvrlabs.xyz/articles/spring-boot-512mb-vps.html) [comments] (https://www.reddit.com/r/programming/comments/1vxl0w4/running_a_java_spring_boot_app_on_a_512_mb_vps/)