why the shapefile read .shp Slower than shapefile(pyshp) of python? It doesn't make

[kl402401]

it don't make any sense

[kl402401]

@tmontaigu

[tmontaigu]

What about sharing the code you use ? and how you compile, and the file you try to read

Your issue doesn't make sense

[tmontaigu]

@kl402401

[tmontaigu]

no info = no bug = no fix

[kl402401]

no info = no bug = no fix

sorry ,it maybe not a bug, but i use the pyshp of python to read and iterate through the .shp that it has 96w shp, it just cost 30secs,but the same .shp, use shapefile of rust ,it cost 180secs

[tmontaigu]

I can't do anything about that unless you give some actual info

• What is the rust code you wrote ?
• How do you run/compile it (don't forget the --release flag)
• Are you able to share the file itself ?

[kl402401]

sorry ,I can't share the file ,it's a secret file.

.it's a road.shp of the beijing that one of the city in china. it may vary big, it has 9.6 million shape in one .shp。

.the rust code just like that, i build it with --release flag:
use std::time::{Instant};
fn main() {
let start = Instant::now();
let mut reader = shapefile::Reader::from_path("D:\road0714out\result1\beijing\road.shp").unwrap();

for result in reader.iter_shapes_and_records() {
    let (shape, record) = result.unwrap();
    println!("Shape: {}, records: ", shape);
    for (name, value) in record {
        println!("\t{}: {:?}, ", name, value);
    }
    println!();
}
let duration = start.elapsed();
let seconds = duration.as_secs();

println!("Execution time in seconds: {}", seconds);

}

[kl402401]

Execution time in seconds: 1114 this time it cost 1114secs, is that the code problem? that maybe a little slow

[tmontaigu]

Does the file have an index file road.shx that goes along with it ?
If so I think I have an idea for the where slowness comes from and know how to fix

[tmontaigu]

Ok, I have a local fix that makes me read a shape file with 2246324 shapes in ~17s intead of 27s

Also, When timing the reading code don't include the prints as its what actually takes most of the time

[kl402401]

Does the file have an index file road.shx that goes along with it ? If so I think I have an idea for the where slowness comes from and know how to fix

it has a 'road.shx'.

Ok, I have a local fix that makes me read a shape file with 2246324 shapes in ~17s intead of 27s

Also, When timing the reading code don't include the prints as its what actually takes most of the time

That's really great,can you update the project?

[tmontaigu]

Fix merged in #36