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cmd/link: use BestSpeed for DWARF compression
DWARF compression accounts for roughly 30% of the linker's time. This CL switches from DefaultCompression to BestSpeed, which virtually eliminates this time. This roughly halves the overhead of handling DWARF in the linker: name \ time/op nodwarf dwarf dwarf-speed BuildCmdGoAll 10.0s ±11% 10.6s ± 5% 10.8s ± 5% nodwarf +6.41% +8.03% dwarf ~ LinkCmdGo 626ms ± 5% 1096ms ± 2% 860ms ± 2% nodwarf +75.17% +37.36% dwarf -21.59% Previously, enabling DWARF had a 75% overhead in link time for cmd/go. This change reduces this overhead to 37% (a 22% reduction). The effect on binary size is minimal compared to DefaultCompression, and still substantially better than no compression: cmd/go bytes nodwarf 10106953 dwarf 12159049 nodwarf+20% dwarf-speed 12408905 nodwarf+23% dwarf-nozlib 17766473 nodwarf+76% Updates #26318. Change-Id: I33bb7caa038a2753c29104501663daf4839e7054 Reviewed-on: https://go-review.googlesource.com/123356 Run-TryBot: Austin Clements <[email protected]> Reviewed-by: Heschi Kreinick <[email protected]>
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