Cosimo Streppone wrote:
However, some bad problems start to be evident only with really high req/s rate.
Another possibility is that once you hit full load you're just pushing the server over the edge for what it can manage load-wise. Use your normal OS monitoring tools and ensure that you've not started to swap excessively or have two many CPU-bound requests.
If it is the case, you'll probably find that you'll benefit from reducing the number of concurrent apache processes.
Carl
