Unless I'm mistaken RAM is much faster than SSDs and since I do rebuild quite often, it would save some R/W cycles on my SSD and allow faster file access.

I do jot mind doing a full rebuild every morning

Solution:

These 2 comments gave me the best indication how to do it: cargo ramdisk and build.target-dir config options.

Would be great if cargo had a build.target-dir-prefix though. One could set and env var CARGO_TARGET_DIR_PREFIX and point it at /dev/shm or /tmp if it's a tmpfs and every rust project would have its artefacts end up in RAM.

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[–] tatterdemalion 4 points 1 week ago

Agreed. Take a look at the cachestat tool to measure how well the page cache is working for cargo builds.

https://www.brendangregg.com/blog/2014-12-31/linux-page-cache-hit-ratio.html