[Issue 18388] std.experimental.logger slow performance

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=18388

--- Comment #11 from Arun Chandrasekaran <aruncxy at gmail.com> ---
s/_logger.tracef/writeln

06-09-2018 20:05:27 vaalaham ~/code/d/std-log-benchmark
$ time ./std-log-benchmark 8 1000000 | tail

real    0m0.975s
user    0m2.067s
sys     0m2.418s
06-09-2018 20:05:29 vaalaham ~/code/d/std-log-benchmark

I can infer that std.format is probably a little slower than fmtlib (C++)
https://github.com/fmtlib/fmt But I need to test more to confirm this claim.

But for sure std.experimental.logger is slow.

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