@jedisct1 How much speedup did you get in recent libsodium due to MAP_POPULATE, presumably for Argon2 & scrypt when memory (de)allocation happens each time? I've just tried it for yescrypt on RHEL6 & 7, getting ~+3% on average (but more stable speeds), up to ~+10% for some sizes.
Fair enough. Thanks a lot for reporting this. I think I’m gonna keep it in sodium since it’s single threaded, but that’s definitely good to know.
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By multi-threaded, I mean not only use of multiple threads to derive one key, but also use of multiple threads or processes in the program to compute multiple single-threaded password hashes concurrently. Both are impacted, and surely the latter is relevant to sodium as well.
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