On 2013-01-31 5:38 AM, Neil wrote:
smaug wrote:
On 01/31/2013 10:37 AM, Nicholas Nethercote wrote:
If we know we're going to turn it off, why not bite the bullet and do
it now?
Because we're still missing plenty of optimizations in our code to be
fast in microbenchmarks.
Do we know (e.g. via profiling) where these optimisations need to be?
No. But imitating the optimizations performed by the PGO compiler will
not be trivial.
(I
don't know how feasible it would be but another approach would be to PGO
less and less code until it starts affecting the microbenchmarks.)
That is kind of what we've been doing so far, and it has proven not to
scale well.
Cheers,
Ehsan
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