Does Proxomitron Increase CPU resources?

eli2k · Private Joined: Mar 27, 2003 Posts: 45 Location: USA

If there are a lot of filters in Proxomitron (eg JD5000 + a bunch of my own webfilters), will it increase CPU resources whenever a page is loaded, since Proxomitron has to look through it all and match the rules...? Otherwise I'm coding my filters inefficiently...

Lepus · Trooper Joined: Mar 02, 2004 Posts: 15 Location: USA

Well, there's no free lunch - more filters will use more CPU, but even more importantly, just one really inefficient filter can use more CPU than dozens of better ones.

eli2k · Private Joined: Mar 27, 2003 Posts: 45 Location: USA

Hmm, what's the most common source of inefficiency when creating a filter? I might have caused this inefficiency. :/

Lepus · Trooper Joined: Mar 02, 2004 Posts: 15 Location: USA

Well, I don't know that any exhaustive research has been done on the subject. Smile

I'd say in general the worst comes come copying bits and pieces from other filters without fully understanding what they do or why they're written that way. It's possible that a filter may work, yet be doing all kinds of unnecessary steps. It's also possible to pick up on someone else's bad habits.

It's good to remember for every spot a filter matches there's thousands of spots it won't, so always optimize for the negative case. In other words, the sooner you can eliminate a possible match the better. For example, a simple bounds match like "<a*</a>" may eliminate many possibilities before performing some more complex check within those tags. You seldom want the bounds to do too much detailed checking - save that for the main match.

Another tip - when possible, start a match with fixed text. It's quicker to check, and when it doesn't match the filter needs to look no further. For example "<*..." rather than "*<*..." or "<a*>&$TST(foo=*bar*)" over "$TST(foo=*bar*)&<a*>"

eli2k · Private Joined: Mar 27, 2003 Posts: 45 Location: USA

I should read up on the Bounds Match feature - I never really understood what it was for. Does Byte Limit help reduce CPU cycles in any way?

I usually do Pattern matches with a text*text match, so that might be okay.


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