There is still a problem with this approach.

As @fphg reports, 
```
ab -c 1 -n 100 http://localhost:8080/mapfishapp/ws/wmc/geodocd58842004a87a980582ff3fe7d8635a9.wmc
```
increments the access_count by 100, but 
```
ab -c 2 -n 100 http://localhost:8080/mapfishapp/ws/wmc/geodocd58842004a87a980582ff3fe7d8635a9.wmc
```
increments the access_count by 60.

IMO, any attempt to get things more synchronized will probably result in a drop in performance, but a better measurement of access counts.

I'd like to hear what @jesseeichar says about this.