Changed to a simpler sum. #604
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This removes two allocations per unique metric, and improves run times considerably
$ benchstat bench-old bench-new
name old time/op new time/op delta
Int64Sum/count-10-4 7.81µs ±37% 3.29µs ± 5% -57.85% (p=0.000 n=10+10)
Int64Sum/count-50-4 36.1µs ±31% 15.6µs ± 7% -56.85% (p=0.000 n=10+10)
Int64Sum/count-100-4 64.7µs ± 5% 31.0µs ± 4% -52.17% (p=0.000 n=8+10)
Float64Sum/count-10-4 8.22µs ±31% 3.50µs ± 2% -57.45% (p=0.000 n=10+10)
Float64Sum/count-50-4 36.2µs ±29% 16.6µs ± 5% -54.13% (p=0.000 n=9+10)
Float64Sum/count-100-4 69.9µs ±15% 33.3µs ± 4% -52.37% (p=0.000 n=8+10)
Int64SumParallel-4 11.4ms ±19% 0.0ms ±51% -99.59% (p=0.000 n=9+10)
Float64SumParallel-4 12.3ms ±31% 0.1ms ±60% -99.57% (p=0.000 n=10+10)
name old alloc/op new alloc/op delta
Int64Sum/count-10-4 1.57kB ± 0% 0.50kB ± 0% -67.98% (p=0.000 n=10+10)
Int64Sum/count-50-4 6.88kB ± 0% 2.85kB ± 0% -58.63% (p=0.000 n=10+10)
Int64Sum/count-100-4 13.8kB ± 0% 5.2kB ± 0% -62.15% (p=0.000 n=10+9)
Float64Sum/count-10-4 1.65kB ± 0% 0.58kB ± 0% -64.68% (p=0.000 n=10+10)
Float64Sum/count-50-4 7.28kB ± 0% 3.25kB ± 0% -55.42% (p=0.000 n=10+10)
Float64Sum/count-100-4 14.6kB ± 0% 6.0kB ± 0% -58.75% (p=0.000 n=9+10)
Int64SumParallel-4 11.9kB ±17% 1.0kB ±20% -91.49% (p=0.000 n=10+10)
Float64SumParallel-4 12.0kB ±19% 1.2kB ±25% -89.91% (p=0.000 n=10+10)
name old allocs/op new allocs/op delta
Int64Sum/count-10-4 46.0 ± 0% 12.0 ± 0% -73.91% (p=0.000 n=10+10)
Int64Sum/count-50-4 208 ± 0% 52 ± 0% -75.00% (p=0.000 n=10+10)
Int64Sum/count-100-4 409 ± 0% 102 ± 0% -75.06% (p=0.000 n=10+10)
Float64Sum/count-10-4 56.0 ± 0% 22.0 ± 0% -60.71% (p=0.000 n=10+10)
Float64Sum/count-50-4 258 ± 0% 102 ± 0% -60.47% (p=0.000 n=10+10)
Float64Sum/count-100-4 509 ± 0% 202 ± 0% -60.31% (p=0.000 n=10+10)
Int64SumParallel-4 387 ±18% 20 ±21% -94.88% (p=0.000 n=10+10)
Float64SumParallel-4 406 ±19% 41 ±25% -89.92% (p=0.000 n=10+10)