Aborts rate observations

I just noticed that the level of aborts that occurs in the system decreases down to a point as I increase the offered load (e.g., the number of clients).

With browsing mix, 120 clients and 2 slave servers, I got an abort rate of 1.27%. Increasing the number of clients to 150 seemed to yield an abort rate of 0.30% increasing the clients to 250 caused an abort rate of 1.80%.

The observations with 8 slave databases are: 1.32% (500 clients), 1.96% (600 clients), 1.87% (550 clients). The throughput remained the same with the three configurations, only the latency changed a bit (by approximately 100ms).

I will have to run step-function tests in order to determine the abort rate trend. The axes of change in this situation should be a) The offered load and b) The database size.