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59c6b7b7ab
In a small script the speed of this feature isn't really noticeable but on Rails it's very noticeable how slow this can be. This PR aims to speed up two parts of the functionality. 1) The Rust exit recording code Instead of adding all samples as we see them to the yjit_raw_samples and yjit_line_samples, we can increment the counter on the ones we've seen before. This will be faster on traces where we are hitting the same stack often. In a crude measurement of booting just the active record base test (`test/cases/base_test.rb`) we found that this improved the speed by 1 second. This also results in a smaller marshal dump file which sped up the test boot time by 4 seconds with trace exits on. 2) The Ruby parsing code Previously we were allocating new arrays using `shift` and `each_with_index`. This change avoids allocating new arrays by using an index. This change saves us the most amount of time, gaining 11 seconds. Before this change the test boot time took 62 seconds, after it took 47 seconds. This is still too long but it's a step closer to faster functionality. Next we're going to tackle allowing you to collect trace exits for a specific instruction. There is also some potential slowness in the GC code that I'd like to take a second look at. Co-authored-by: Aaron Patterson <tenderlove@ruby-lang.org> Co-authored-by: Aaron Patterson <tenderlove@ruby-lang.org> |
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