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#perf

4 posts3 participants0 posts today
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Anisse

That gives us our baseline: bzip2 (in C) vs bzip2 (in Rust). But is it a fair enough comparison? I mentioned initially that I was implementing an lbzip2 "clone" (mostly a PoC for the decompression part). lbzip2 is an other program (a C binary, without a library), that can compress and decompress bzip2 files in parallel. Surely it should be slower than bzip2 since it has the parallel management overhead? 7/N

#lbzip2#bzip2#RustLang
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Anisse

But why? Let's see what perf stat has to say: the Rust version has less instructions, but with much less IPC (Instruction-per-clock); the Rust version also has less branches and misses in general. On the efficiency cores, we see that worse IPC and branch prediction of the Rust version give the advantage to the C version. 6/N

#bzip2#RustLang#perf
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