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26 lines
1.1 KiB
Markdown
26 lines
1.1 KiB
Markdown
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## PAC-Script Performance Analysis
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Somewhere in PAC-script you may want:
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```javascript
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if (Is_subdomain_of( host, blocked_hosts ))
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return 'use proxy';
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```
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You have to make `Is_subdomain_of` very fast.
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This check is executed on each request. You should watch memeory consumption too.
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The naive solution is to keep array of blocked ips and check if the host resolves to one of the ips.
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You may do it with `indexOf`, binary search, etc.
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The shortcoming of every ip solution is that __some providers resolve blocked hosts to wrong ips__, so we eventually need list of hosts.
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I have tested different solutions, and depicted [results](./benchmark/Output.txt) in the following chart:
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* __IPs indexOf__ <20> Blocked IP is searched by `indexOf`
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* __IPs binary__ <20> Blocked IP is searched by binary search. For some reason miss time slightly increased.
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* __IPs switch__ <20> Simply `switch(Blocked_IP) { case1: ... caseN: return true }`. Works even better than binary search. Magic.
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* __Hosts switch__ <20> Radix trie built on `switch`. Comparable to __IPs switch__.
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