Profile-guided optimization (PGO)

[Johan Engelen via digitalmars-d-ldc]

On Wednesday, 23 December 2015 at 13:10:33 UTC, Kagamin wrote:
> On Thursday, 10 December 2015 at 14:38:19 UTC, Liran Zvibel 
> wrote:
>> Also, for use cases like ours, where the system runs for 
>> extended periods of time, and optimizing the init time, which 
>> may be minutes is not interesting at all, just being able to 
>> run perf while the system is doing something interesting to 
>> improve is a big plus.
>
> As I understand, if the profiling runs long enough, the 
> long-running statistics will dominate startup statistics?

The profiling is pretty simple: it is just a bunch of counters 
whereever the code branches. So indeed, long runs will have 
long-running statistics dominate startup statistics.