it is compiled with VC++ 6, under Windows 2000. I use it as-is to parse a pretty big XML file (understand, 2MB file), which is on my hard drive.
The fact is, when I run it on my dev PC, on which I have compiled it, it takes really long to run. It is a Pentium III 800, with 384MB of RAM (SDRAM). It takes about 30s to parse the file (the time needed to initialize the parser is neglectable, under 70ms). I tried to see if the hard drive had an influence, by placing the file on a distant server on the LAN, without any visible effect on the running time.
I've tried the same executable file on another PC under Windows 2000 also, which is a more recent Pentium IV at 2.5Ghz, with 1GB of DDR. It takes... 0.4s to parse the same file. Which is much more what I was expecting.
I am just guessing, but I'd rather think, that this speed increase has more to do with available RAM-Size than it has to do with processor speed. This sounds pretty interesting. Did you try to parse different sizes of XML-documents, like doubling and halfing the size several times? (trying with a 1MB-file on both PCs, a 500 KB, a 250KB and then 4 MB, 16MB, 32MB?)
Did you make sure this is no problem with the memory or the file cache? Just ideas, I really don't know, what the influences are here, but I try to be helpful...
I would be interested in your results,
In fact, after 2 or 3 days of intense testing on a lot of different computers, either older or newer than mine, I realized that only my computer was taking 30s to parse the file, on all the others it ranged from 0.4 s (P IV 2.5Ghz) to about 3s (PII 450)... Even on another PC, exactely the same model as mine, with the same RAM, same processor, same everything (they were bought together), it took only 1.5s...
... and the reason was simple : the XML file was referencing a XML-Schema with an absolute path on *my* hard drive... That way, on any other computer, the parser couldn't find the XML-Schema, didn't do the validation, without any error message.
After solving this pretty dumb mistake, and trying again on several computers, they all take about the same time for parsing and validating the file, from 26 to 32s. And I found the reason : my schema is importing schemas from the web, themselves importing schemas from the web and so on... Therefore, the speed of the internet connexion is the major speed factor on my example...
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