21.9.04
13:58 JNetstream Performance (
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Yesterday I wrote a small application which read the first and last timestamp of a pcap file. For this, I used the Jnetstream library. The library is probably completely oversized for what I want to do, but it includes pcap file read which is what I mainly need.
My program (don't have it completely in mind) looks like this:
Decoder dec = new Decoder(pcapFile)
Packet first = dec.nextPacket();
Packet act;
Packet last;
while ( (act = dec.nextPacket() != null)
last = act;
System.out.println(first.getProperty("timestamp"));
System.out.println(last.getProperty("timestamp"));
The program did what it is supposed to do, but the performance was very bad. It took 2,5 seconds to parse a 61kb file (-> nearly 121 hours for a 1 GiB file). I don't know
Maybe I did something wrong and there is a faster method. I will try to investigate on it, if not I will have to implement my own FastPcapReader (help is welcome).
posted by Jean-Marc Autexier |
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