On Wed, Aug 20, 2003 at 10:14:04PM +0200, Leopold Toetsch wrote: > The main time consuming task is just constructing the exception object. > Real objects might be faster here, but all the runtime construction of > such complex objects suffer of the same problem: we don't have constant > and cached strings (meaning currently: each hash key is a new string) > and we don't have means to create constant shared PMCs at runtime.
As of (I think 5.8) Perl 5 started using shared hash keys - all hash keys are shared [and reference counted - this is perl 5 :-)], so that 1: if the same string is ever used a second time memory is saved 2: the string compare routine for hash key lookup first checks to see if the pointers are the same. If so, it can skip the memcmp() I believe that Nick I-S said that this hash key sharing accelerated his large work TK app by about 2%. Benchmarking Perl 5 usefully is hard - I don't yet have any good benchmark for Perl 5. (It's number 3 on my post Paris TODO. Only our washing machine has now broken, so number 2 is reasserting itself - "laundry". At this rate I'll never get to number 4 - CV) Nicholas Clark
