very slow about xml-rs HOT 10 CLOSED

Can you post your code? How are you reading the file? Note, the example from the project main page doesn't use a BufReader so this might actually be the bottleneck.

from xml-rs.

just like example

let file = File::open(&filename).unwrap();
let start = PreciseTime::now();
let mut parser = EventReader::new(file);

for e in parser.events() {
    match e {
        XmlEvent::StartElement { name, .. } => {
        }
        XmlEvent::EndElement { name } => {
        }
        XmlEvent::Error(e) => {
            println!("Error: {}", e);
            break;
        }
        _ => {}
    }
}
let end = PreciseTime::now();
println!("{} seconds for whatever you did.", start.to(end));

from xml-rs.

Can you try wrapping file with BufReader? https://doc.rust-lang.org/stable/std/io/struct.BufReader.html

Something along the lines of:

let file = File::open(...)...
let file = BufReader::new(file)...
...

I'd be interested how much this helps.

from xml-rs.

Yes, the example on the main page was written when File was a buffered reader itself, it was long time ago. I didn't update it for BufReader since. Because xml-rs essentially processes the input code point-wise, it is very likely that absence of buffering is the bottleneck.

If BufReader won't help, could you please post the XML document you're working with? I'll try to look what's happening there.

from xml-rs.

with BufReader:
rust: 00.525 sec

for me its ok the issue can be closed but as incentive:
nim: 0.049 sec (xmlparser) :-)

from xml-rs.

Would you mind trying and posting the result with rust-{beta,nightly}? :)

from xml-rs.

Yeah, I didn't optimize the parser very much, it is very likely that there are bottlenecks. I have some work on this in dev branch.

from xml-rs.

just for fun nightly: 0.475 sec. but honestly the rust compiler will not generate 10x faster binaries in near future ;-)

from xml-rs.

sure, i fully agree. i just was curious how much things have changed on nightly since the 1.1 release. many thanks so far.

from xml-rs.

I guess I'm closing this for now. Feel free to reopen if you still have problems.

from xml-rs.