I tried a little while back to mine on cloudatcost since I have 20 cpus on my account. Using ubuntu 14.04 I tried to mine with a 16 cpu installation. they all hashed for 1/16th of one cpu. One cpu, if i set the affinity to that only one where the other cores weren't doing anything as i monitored with htop, would do the same thing, 1/16th.
I know the hashrate of a single one of those CPUs because If i create a 2cpu installation they hash for just as much, collectively.
And when i start the miner at any cpu count, they instantly mine with each cpu at max hashrate then a few seconds later it gets spread out depending on the number of cpus. Any help?