I worked on some performance improvements for lldb 3.9, and was about to forward port them so I can submit them for inclusion, but I realized there has been a major performance drop from 3.9 to 4.0. I am using the official builds on an Ubuntu 16.04 machine with 16 cores / 32 hyperthreads.
Running: time lldb-4.0 -b -o 'b main' -o 'run' MY_PROGRAM > /dev/null With 3.9, I get: real 0m31.782s user 0m50.024s sys 0m4.348s With 4.0, I get: real 0m51.652s user 1m19.780s sys 0m10.388s (with my changes + 3.9, I got real down to 4.8 seconds! But I'm not convinced you'll like all the changes.) Is this expected? I get roughly the same results when compiling llvm+lldb from source. I guess I can spend some time trying to bisect what happened. 5.0 looks to be another 8% slower.
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