Low performance when read large file with cordova-plugin-file

[Jeremy38100]

am creating a hybrid app with Angular 7, Ionic 4 and Cordova.

I need to read a large file (> 1GB) located on Android file system but i am facing a performance issue. With the current implementation i have a speed about 2.5 MB/sec.

Is it an issue with the plugin itself or the implementation ?

I tried to modify BLOB_SIZE but the maximum speed i obtained was 2.5 MB/s.

const BLOB_SIZE = 1024*1024;

usbRead(fileEntry: FileEntry) {
      fileEntry.file((file) => {
        const reader = new FileReader();

        reader.onload = () => {
          const buffer = new Uint8Array(reader.result as ArrayBuffer);
          readCounter += buffer.byteLength;
          console.log(textDecoder.decode(buffer));
          offset += BLOB_SIZE;
          if (offset >= file.size) {
            console.log('end');
            return;
          }
          const slice = file.slice(offset, offset + BLOB_SIZE);
          reader.readAsArrayBuffer(slice);
        };

        reader.readAsArrayBuffer(file.slice(0, BLOB_SIZE));
      });
    });
  }

I tested on Xiaomi Redmi Note 7 with Android 9

My package.json has the following plugin version : @ionic-native/file": "^5.12.0"

• [x] I searched for existing GitHub issues
• [x] I updated all Cordova tooling to most recent version
• [x] I included all the necessary information above

[spd9100]

hey i am also faceing same issue you got any solution please share with me

[mzielezny]

I noticed similar issue with 10 - 20 MB files (read was unexpectly slow) - I have increase speed of reading (25%) by changing READ_CHUNK_SIZE in FileReader.js - currently it is set to 256KB - when you adjust it, you should notice some improvements.

[spd9100]

thanks to giving replay but its not solve my problem its take more time to read bloab

On Sun, Mar 8, 2020 at 3:18 PM Marcin [email protected] wrote:

I noticed similar issue with 10 - 20 MB files (read was unexpectly slow) - I have increase speed of reading (25%) by changing READ_CHUNK_SIZE in FileReader.js - currently it is set to 256KB - when you adjust it, you should notice some improvements.

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[WuglyakBolgoink]

@Jeremy38100 / @Avinash9100

did you found any solution for this?

only what I found currently is : https://stackoverflow.com/questions/54946864/out-of-memory-error-when-calling-readasarraybuffer-method-on-filereader-of-the-c