Compression speed too low

[erenturkm]

Hi,

I am using sevenz-rust version 0.4.3, with Rust 1.71 on Windows. I am using the code below:
`
use std::path::{Path, PathBuf};
use std::fs::{File,OpenOptions};
use sevenz_rust::lzma::{LZMA2Options ,LZMA2Reader,LZMA2Writer};
use sevenz_rust::{SevenZReader, SevenZWriter, Password, SevenZArchiveEntry};
use std::{process::exit};
use std::time::Instant;

fn main() {
let verb_duration=Instant::now();
let file_name="testdir\folder1\file3.txt";
let file_path=PathBuf::from(file_name);

let archive_path=PathBuf::from("test.7z");
let file_handle = File::create(archive_path).unwrap();
let mut zip:SevenZWriter<File>;
let res_zipwriter=SevenZWriter::new(file_handle);
match res_zipwriter {
    Ok(z)=>{zip=z;}
    Err(e)=>{exit(1)}
}
let entry_name=file_name.replace("\\", "/");
let zipentry= SevenZArchiveEntry::from_path(file_path.clone(),entry_name);
let file_handle=File::open(file_path.clone()).unwrap();
let res_write=zip.push_archive_entry(zipentry,Some(file_handle));
zip.finish();
println!("{:?}",verb_duration.elapsed());

}
`
file3.txt is a 50MB text file and above code takes 54 seconds to generate 9 KB file.
When I use 7zip archiver, it takes less than a second and generates 9KB file.
I am hoping that there is a setting that I am missing to speed things up?

[dyz1990]

@erenturkm Did you run this code in release mode?

[erenturkm]

No, it was debug mode, I tried it with release mode and its taking 4.2 seconds which is still less than %25 speed of the original archiver. Since I will be using it for very large text files (100MB+), I need a solution that is minimum %75 slower, preferably better than the original solution.

[dyz1990]

At present, the compression speed can only be increased by reducing the compression rate.But the compressed file will also become larger

zip.set_content_methods(vec![
            LZMA2Options::with_preset(3).into(),//preset: from 1 to 9, default  6
        ]);