tarantool / luajit / 6854723694

89%

tarantool/master: 93%

push

github

profilers: purge generation mechanism

Since both of the profiler parsers are now processing
the events in a stream-like fashion, the generation
mechanism is excessive and can be purged. This results
in a significant memory consumption drop, especially
for the AVL-tree part.

Consider this script:
| jit.off()
| misc.sysprof.start{mode = 'C', interval=10}
| for i = 1, 1e7 do tostring(i) end
| misc.sysprof.stop()

After executing it with LuaJIT, you can parse it like this:
| $ time -v luajit-parse-sysprof sysprof.bin

So, before the patch:
| Maximum resident set size (kbytes): 224928

And after the patch:
| Maximum resident set size (kbytes): 32780

That is the 85% reduction in memory consumption.

Follows up tarantool/tarantool#8700

Reviewed-by: Sergey Kaplun <skaplun@tarantool.org>
Reviewed-by: Sergey Bronnikov <sergeyb@tarantool.org>
Signed-off-by: Igor Munkin <imun@tarantool.org>
(cherry picked from commit 090117d83)

5326 of 5957 branches covered (0.0%)

Branch coverage included in aggregate %.

20430 of 23231 relevant lines covered (87.94%)

690740.59 hits per line