Comment #5 on issue 4406 by rsturg...@google.com: profiler has huge impact
on performance for some code (mac)
https://code.google.com/p/v8/issues/detail?id=4406
Looks like it's an issue with use of AVX instructions on these machines.
If I run with --noenable_avx there is no slowdown while profiling. Use of
AVX was introduced in January:
https://chromium.googlesource.com/v8/v8/+/03fbb053b39b4765a5b848e4b3dddbccb8d19889
so profiling on these macs (and presumably other machines with the same
cpu) has been broken since then :(
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