Exemple #1
0
// Calls rand 4 times
func (b *Buy) MakeOne(w int, local_seed *uint32, sp uint32, txn *ddtxn.Query) {
	var bidder int
	var product int
	if *partition {
		rnd := ddtxn.RandN(local_seed, sp/8)
		lb := int(rnd)
		bidder = lb + w*int(sp)
	} else {
		bidder = int(ddtxn.RandN(local_seed, uint32(b.nbidders)))
	}
	x := int(ddtxn.RandN(local_seed, 100))
	if b.zipfd > 0 {
		product = int(b.z[w].Uint64())
	} else {
		product = int(ddtxn.RandN(local_seed, uint32(b.nproducts)))
	}
	if x < b.read_rate {
		if x > b.ncontended_rate {
			// Contended read; use Zipfian distribution or np
			txn.K1 = ddtxn.UserKey(uint64(bidder))
			txn.K2 = ddtxn.ProductKey(product)
		} else {
			// (Hopefully) uncontended read.  Random product.
			product = int(ddtxn.RandN(local_seed, uint32(b.nbidders)))
			txn.K1 = ddtxn.UserKey(uint64(bidder))
			txn.K2 = ddtxn.ProductKey(product)
		}
		txn.TXN = ddtxn.D_READ_TWO
	} else {
		amt := int32(ddtxn.RandN(local_seed, 10))
		txn.K1 = ddtxn.UserKey(uint64(bidder))
		txn.K2 = ddtxn.ProductKey(product)
		txn.A = amt
		txn.TXN = ddtxn.D_BUY
	}
}