Free Hydrus Network 53712/3/2023 Setting the minimum free kilobytes higher will avoid the running of the OOMkiller which is always preferable, and almost always preventable. The OOM kill decides which program to kill to reclaim memory, since hydrus loves memory it is usually picked first, even if another program asking for memory caused the OOM condition. Increase the vm.min_free_kbytes value to prevent this scenario. If vm.min_free_kbytes is less than the ammount requested and there is no virtual memory left, then the system is officially unable to service the request and will lauch the OOMKiller (Out of Memory Killer) to free memory by kiling memory glut processes. If for a given request the amount of memory asked to be allocated is under vm.min_free_kbytes, but this would result in an ammount of total free memory less than vm.min_free_kbytes then the OS will clean up memory to service the request. The default value is vm.min_free_kbytes=65536, which means 66MiB (megabytes). The watermark's name is vm.min_free_kbytes, it is the number of kilobytes the system keeps in reserve, and therefore the maximum amount of memory the system can allocate in one go before needing to reclaim memory it gave eariler but which is no longer in use. Linux will only cleanup if the available total real and virtual memory falls below the watermark as defined in the system control configuration file /etc/nf. This means that the system will continue to give your process memory from the real and virtual memory pool(swap) until there is none left. Linux's memory allocator is lazy and does not perform opportunistic reclaim. Reboot for all changes to take effect, or use sysctl to set vm variables. You may also wish to use a swapfile type that uses compression, this saves you some disk space for a little bit of a performance hit, but also significantly saves on mostly empty memory. You may add as many swapfiles as you like, and should add a new swapfile before you delete an old one if you plan to do so, as unmounting a swapfile will evict its contents back in to real memory.
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