When I 'go test -bench . -benchmem', I sometimes see small numbers reported
in allocs/op that I can't spot in the code for the function that was
benchmarked. For example,
the following function:
func Mul_c(m1, m2, m3 *Matrix) {
// validate
r1, c1 := m1.Dim()
r2, c2 := m2.Dim()
r3, c3 := m3.Dim()
if c1 != r2 {
panic("incompatible source matrices")
}
if r3 != r1 || c3 != c2 {
panic("incompatible destination matrix")
}
// get scratch buffer
scratch := f32scratch.Get(r2)
trow := scratch.buf[:r2]
// matrix multiply
for m2c := 0; m2c < c2; m2c++ {
// transpose m2 col into scratch row
i := m2c // m2 col start index
for m2r := 0; m2r < r2; m2r++ {
trow[m2r] = m2.data[i]
i += c2 // to next row
}
// compute dot products with m1 rows
for m1r := 0; m1r < r1; m1r++ {
row := m1.Row(m1r)
dot := f32s.Dot(row, trow)
m3.Set(m1r, m2c, dot)
}
}
f32scratch.Put(scratch)
}
This will produce the following info when benchmarked:
BenchmarkMul_c-8 1000 1558733 ns/op 69 B/op 2 allocs/op
How to know what these two allocs are?
Another question, suppose we have a function that can alloc different
amounts of memory on each run, will the reported allocs/op be averaged over
the number of times the function ran?
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