On 10/02/2010 09:57 PM, miss c wrote: > I saw the memoryprofiling debug option to enable the TCMalloc's memory > profiling. Reading up on it here > http://goog-perftools.sourceforge.net/doc/tcmalloc.html I guess you're talking about the "MemProfiling" debug setting? (When talking about less well known debug settings, please always mention their exact name to avoid confusion. Sometimes there are several similar ones.)
> Will this enhance the performance of my viewer or is this legacy? While I don't know what that option does exactly, it sounds like it doesn't choose which library to use for memory allocation, but rather enables profiling *if* the used library is TCMalloc. I don't how TCMalloc usage would be enabled, but I guess that'd be a compile time option, not a run time one. While the usage of TCMalloc might make things faster compared to other malloc implementations, enabling /profiling/ (presumably: measuring how many allocations happen where and when in the program) is more likely to slows things down. > If it will enhance it, why is this option not on by default? Can > someone enlighten me please? According to http://google-perftools.googlecode.com/svn/trunk/doc/heapprofile.html , their heap profiling (which might well be what the debug option toggles) "can be useful for * Figuring out what is in the program heap at any given time * Locating memory leaks * Finding places that do a lot of allocation" This means it's mostly interesting for developers who are either debugging something and thus want to see what happens in the memory they've allocated or who are hunting memory leaks or other reasons of extensive memory usage (or rapid allocation/deallocation cycles, etc.). I don't think enabling it would directly benefit the typical end user in any way. Cheers, Boroondas PS: There's lots off guesswork involved in the above, so anyone who knows more/better, please correct me.
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