J. Bakshi wrote:
I am running an apache server at a remote debian box which have 4 GB RAM and quad-core intel CPU. During the development period the site was first. But after finishing the site when people start to access it, the site some times become very very very slow. There is no noticeable load on the system, but still the site is not working as fast as it were in its development period.
Double check that you aren't using your swapfile (the 'top' utility can tell you this). If too many concurrent Apache processes are allowed, they'll soak up all your RAM and more, and having to swap them to disk kills performance stone dead. While you're in 'top', you might check to see what is using the CPU while the site is running slow.
Does your site use a database? Could the slowdown be due to competition for exclusive locks on tables? This could cause a site slowdown even with low CPU usage.
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