Hacker News Reader

I posted this in a comment already, but the results here line up with the original BOLT paper.

“For the GCC and Clang compilers, our evaluation shows that BOLT speeds up their binaries by up to 20.4% on top of FDO and LTO, and up to 52.1% if the binaries are built without FDO and LTO.”

“Up to” though is always hard to evaluate.

View on HN

"Up to" is one of those "technically correct", it's probably more genuine and ethical to give a range in the same circumstances. If 95% of binaries get at least 18%. but the remaining 5% get much less than that, and that's important, then say that, maybe.

When i see stuff like this, i usually infer that 95% gets a median of 0% speedup, and a couple of cases get 20.4% or whatever. But giving a chart of speedups for each sort of thing that it speeds up (or doesn't) doesn't make for good copy, i think.

Up to 10000% I think

https://xkcd.com/870/

Reply on news.ycombinator.com