Benchmark stdlib compression code

At PyConUS, I was chatting with @gpshead about adding compression benchmarks. While a lot of the "heavy lifting" of compression happens in the libraries CPython binds (zlib, liblzma, etc.), the handling of output buffers in CPython has a significant impact in performance, and is something we don't have a lot of visibility into the performance of.

One of the better known cross-algorithm compression benchmarks I'm aware of is lzbench, which tests compression performance of the Silesia compression corpus across many algorithms. I figure running compression benchmarks at varied settings on Silesia would provide a good starting point for benchmarking the output buffer and other binding code.

ファイル、テスト、エントリポイントは指定されていません。まず pyperformance の既存のベンチマーク構造を確認し、次に lzbench の Silesia 手法と zlib/liblzma のバインディングを比較して、さまざまな設定と出力バッファの測定方法を定義してください。Issue に記載された CPython 側のパフォーマンスを明らかにする、再現可能な圧縮ベンチマークができれば完了です。