Re: Re: PHP profiling results under 2.0.37 Re: Performance of Apache 2.0 Filter

On Sun, Jun 09, 2002 at 03:09:24AM +0300, Zeev Suraski wrote: > Hmm, but doesn't that mean that the largest contiguous block this heap will > be able to provide is 8KB, then? 8K is just the minimum chunk size, there is no absolute maximum. > > * There's a two-layer structure to the heaps: > > - apr_pool objects are what the application uses. Each pool > > provides a fast alloc interface, no free function, and a > > "destructor" that returns all the allocated space when the > > pool is destroyed. > > This is probably not very suitable for PHP. We allocate and free *a lot*, > not being able to free is going to increase memory consumption > significantly. If we use APR heaps, are we bound by this behavior? The expectation is that pools are cleared at normal intervals, so that eventually the memory allocation for an application reaches a "steady state". In PHP this could be accomplished by simply using the per-request pool that is already available when the internal PHP functions are called from httpd. At the end of a request this pool is "cleared", and then able to be reused on subsequent requests. -aaron