High CPU usage during build operation when verbose is enabled

[christo]

Seeing high CPU usage by codeblocks, more than that of gcc, during compilation. I'm working external makefile project (makefile generated by cmake), and lot of verbose is enabled.

When analysed by perf, pcre2_match_32 is taking most of the CPU. Cause is that each of the build log line is check against 34 regular expressions.

I'm not much familiar with regex, but can anything to be done to improve the performance here?

[ollydbg]

I believe that there are a lot of codes to parse the compiler log message. So, if the compiler generate a lot of warnings, it takes a lot of time to parse those output.

So, sometimes, the building stage is really slow.

Not sure how to improve.

If I remember correctly, I have added some checks for the return line encoding, see this: The encoding text from GCC compiler should be UTF8 by default?

[blauzahn]

Some regex implementations are known to perform badly. For details see e.g:

see:
https://stackoverflow.com/questions/70583395/why-is-stdregex-notoriously-much-slower-than-other-regular-expression-librarie

https://www.open-std.org/JTC1/SC22/WG21/docs/papers/2019/p1433r0.pdf

https://github.com/hanickadot

https://www.youtube.com/watch?v=7-aXp-u6008&ab_channel=NDCConferences

or search for slow c++ regex.

[stahta01]

I would suggest disabling all the CB plugins you are not using or try selecting a different default compiler to see if any difference happens.

Tim S.