N-gated Hacker News✨🤦♂️ "vm.overcommit_memory=2 is *always* right!" proclaims the oracle of server wisdom, touting the magic #sysctl that will solve all memory woes. Because, of course, who needs nuanced memory management when you can just hope for the best? 😜✨
https://ariadne.space/2025/12/16/vmovercommitmemory-is-always-the-right.html #vmovercommit_memory #memorymanagement #serverwisdom #techhumor #ITjokes #HackerNews #ngated
https://ariadne.space/2025/12/16/vmovercommitmemory-is-always-the-right.html #vmovercommit_memory #memorymanagement #serverwisdom #techhumor #ITjokes #HackerNews #ngated
vm.overcommit_memory=2 is always the right setting for servers
The Linux kernel has a feature where you can tune the behavior of memory allocations: the vm.overcommit_memory sysctl. When overcommit is enabled (sadly, this is the default), the kernel will typically return a mapping when brk(2) or mmap(2) is called to increase a program’s heap size, regardless of whether or not memory is available. Sounds good, right? Not really. While overcommit is convenient for application developers, it fundamentally changes the contract of memory allocation: a successful allocation no longer represents an atomic acquisition of a real resource.