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# Resource Usage and Management
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## Usage
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* threads
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* configurable number of [threads](config/threads.md)
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* reading from kernel
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* processing messages from kernel
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* readdir concurrency
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* memory
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* 1MB+ pre reader thread + inflight processing for messages
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depending on [fuse-msg-size](config/fuse-msg-size.md)
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* buffers allocated temporarily for reading directories
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* FUSE nodes
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* noforget forgotten nodes
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## Management
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* To limit the risk of the Linux kernel's OOM Killer targeting
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mergerfs it sets its
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[oom_score_adj](https://man7.org/linux/man-pages/man5/proc_pid_oom_score_adj.5.html)
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value to -990.
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* mergerfs increases [its available file descriptor and file size
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limit.](https://www.man7.org/linux/man-pages/man3/setrlimit.3p.html)
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* mergerfs sets its [scheduling
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priority](https://man7.org/linux/man-pages/man3/setpriority.3p.html)
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(nice value) to -10 ([by default](config/options.md)), raising its
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CPU scheduling priority above the default of 0.
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* The [readahead](config/readahead.md) values of mergerfs itself and
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managed filesystems can be modified.
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