Increase rack benchmark size

[casperisfine]

Currently the rack benchmark really doesn't do a whole lot. It's a single rack application with just the rack router, so it's basically a handful of method calls and hash lookups.

Even on the interpreter, it's ~40ms for 10k requests per iteration, that's really not a whole lot of code to exercise for a benchmark.

By adding a bunch more standard middlewares that most applications in the while actually do run, we can make the benchmark a bit more relevant.

Before:

interp: ruby 3.3.1 (2024-04-23 revision c56cd86388) [arm64-darwin23]
yjit: ruby 3.3.1 (2024-04-23 revision c56cd86388) +YJIT [arm64-darwin23]

-----  -----------  ----------  ---------  ----------  ------------  -----------
bench  interp (ms)  stddev (%)  yjit (ms)  stddev (%)  yjit 1st itr  interp/yjit
rack   42.0         1.9         35.0       4.9         1.13          1.20
-----  -----------  ----------  ---------  ----------  ------------  -----------

After:

interp: ruby 3.3.1 (2024-04-23 revision c56cd86388) [arm64-darwin23]
yjit: ruby 3.3.1 (2024-04-23 revision c56cd86388) +YJIT [arm64-darwin23]

-----  -----------  ----------  ---------  ----------  ------------  -----------
bench  interp (ms)  stddev (%)  yjit (ms)  stddev (%)  yjit 1st itr  interp/yjit
rack   225.2        1.1         191.8      2.1         1.15          1.17
-----  -----------  ----------  ---------  ----------  ------------  -----------

[maximecb]

Thanks Jean. We still get very little speedup. Is rack mostly a native gem?

[casperisfine]

Is rack mostly a native gem?

No, it's pure Ruby. But it doesn't do a whole lot except simple method calls and hash lookups.

I'll profile it.

[casperisfine]

Lol:

I'll see if this Dir.pwd is strictly required. Or maybe just remove that middleware.

[casperisfine]

https://github.com/Shopify/yjit-bench/pull/298

[casperisfine]

Figured it out: https://github.com/Shopify/yjit-bench/pull/299