Problem can be reproduced on Chrome, using the following files. Note, pkzip.js needs to be in same directory as this file.
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>Demonstrate jszip memory use</title>
<base />
</head>
<body>
<button id="prepZip">Prepare Zip</button>
<button id="genZip">GenerateZip</button>
<script src="jszip.js"></script>
<script>
"use strict";
class ZipTest {
prepZip() {
let content = "dummy";
let zipOptions = { compression: "DEFLATE" };
this.zipFile = new JSZip();
for(let i = 0; i < 20000; ++i) {
this.zipFile.file(`${i}.txt`, content, zipOptions);
};
}
genZip() {
return this.zipFile.generateAsync({ type: "blob" }).then(function (content) {;
return Promise.resolve();
})
}
init () {
document.querySelector("#prepZip").onclick = this.prepZip.bind(this);
document.querySelector("#genZip").onclick = this.genZip.bind(this);
}
}
let test = new ZipTest();
test.init();
</script>
</body>
</html>When above html file is first opened, memory shown in Task manager is 15 Megs.
After clicing PrepareZip, and forcing a Garbage collection, Memory is 32 Megs.
After clicking GenerateZip, memory climbs to more than 3 Gigs, then "Aw Snap" appears on Chrome.
The root cause seems to be generateWorker() in https://github.com/Stuk/jszip/blob/master/lib/generate/index.js
This creates a compression worker for each file to be compressed, before starting to compress any file.
Each worker contains 9 buffers that are 64 kbyte in length.
Problem can be reproduced on Chrome, using the following files. Note, pkzip.js needs to be in same directory as this file.
When above html file is first opened, memory shown in Task manager is 15 Megs.
After clicing PrepareZip, and forcing a Garbage collection, Memory is 32 Megs.
After clicking GenerateZip, memory climbs to more than 3 Gigs, then "Aw Snap" appears on Chrome.
The root cause seems to be generateWorker() in https://github.com/Stuk/jszip/blob/master/lib/generate/index.js
This creates a compression worker for each file to be compressed, before starting to compress any file.
Each worker contains 9 buffers that are 64 kbyte in length.