cash is an alternative implementation of the Linux cachefiles
userspace daemon. Unlike cachefilesd (the primary
implementation), it uses efficient data structures and io_uring,
which makes it scale well to multi-terabyte cache partitions.
We developed this project because cachefilesd did not scale well
with large cache partitions; for months, it ran at 100% CPU without
making any progress, effectively disabling the cache because no old
files were discarded and therefore no new files could be added. The
reason was that cachefilesd keeps its file list in a sorted array,
which is extremely inefficient. Improving this old C code base did
not seem worth it, because a new implementation in C++ took less time
than that.
The name "cash" is a play on the pronounciation of "cache" vs "cash". Maybe this project deserves a better name...
You need:
Optional dependencies:
Get the source code:
git clone --recursive https://github.com/CM4all/cash.git
Run meson:
meson setup output
Compile and install:
ninja -C output ninja -C output install
After installing the build dependencies (dpkg-checkbuilddeps),
run:
dpkg-buildpackage -rfakeroot -b -uc -us