The following is a bundle of sysctl and other things to make linux keep more data from disk in memory.
The last line specifically precaches a huge amount of file data immediately to memory, you should use du -h -d0 /path/to/somewhere' to find out how big the paths you set for this. A typical /usr` folder on current linux will be around 7gb, and my go compilation cache sits at around 11gb, which is comfortable in 32gb and it definitely speeds things up.
#!/bin/bash
modprobe bfq
for d in /sys/block/nvme0*
do
# HDD (tuned for Seagate SMR drive)
echo bfq > "$d/queue/scheduler"
echo 4 > "$d/queue/nr_requests"
echo 32000 > "$d/queue/iosched/back_seek_max"
echo 3 > "$d/queue/iosched/back_seek_penalty"
echo 80 > "$d/queue/iosched/fifo_expire_sync"
echo 1000 > "$d/queue/iosched/fifo_expire_async"
echo 5300 > "$d/queue/iosched/slice_idle_us"
echo 1 > "$d/queue/iosched/low_latency"
echo 200 > "$d/queue/iosched/timeout_sync"
echo 0 > "$d/queue/iosched/max_budget"
echo 1 > "$d/queue/iosched/strict_guarantees"
# additional tweaks for SSD (tuned for Samsung EVO 850):
if test $(cat "$d/queue/rotational") = "0"
then
echo 36 > "$d/queue/nr_requests"
echo 1 > "$d/queue/iosched/back_seek_penalty"
# slice_idle_us should be ~ 0.7/IOPS in µs
echo 16 > "$d/queue/iosched/slice_idle_us"
echo 10 > "$d/queue/iosched/fifo_expire_sync"
echo 250 > "$d/queue/iosched/fifo_expire_async"
echo 10 > "$d/queue/iosched/timeout_sync"
echo 0 > "$d/queue/iosched/strict_guarantees"
fi
echo 9 > /proc/sys/vm/swappiness
echo 10 > /proc/sys/vm/vfs_cache_pressure
echo 99 > /proc/sys/vm/dirty_ratio
echo 50 > /proc/sys/vm/dirty_background_ratio
echo 18000 > /proc/sys/vm/dirty_expire_centisecs
echo 18000 > /proc/sys/vm/dirty_writeback_centisecs
nice find /home/loki/.cache/go-build /usr -type f -print0 | nice ionice -c 3 wc -l --files0-from - > /dev/null
done