Node.js缓冲区的最大大小是多少 [英] What's the maximum size of a Node.js Buffer

问题描述

读取文件太大而无法放入缓冲区时出现致命错误.

I got a fatal error reading a file was too big to fit in a buffer.

FATAL ERROR: v8::Object::SetIndexedPropertiesToExternalArrayData() length exceeds max acceptable value

或者

RangeError:大小"参数不得大于2147483647 在Function.Buffer.allocUnsafe(buffer.js:209:3)

RangeError: "size" argument must not be larger than 2147483647 at Function.Buffer.allocUnsafe (buffer.js:209:3)

如果我尝试分配1GB缓冲区，则会遇到同样的致命错误，

If I try to allocate a 1GB Buffer I get the same fatal Error,

var oneGigInBytes = 1073741824;
var my1GBuffer = new Buffer(oneGigInBytes); //Crash   

Node.js Buffer类实例的最大大小是多少?

What is the maximum size of a Node.js Buffer class instance?

推荐答案

V8中类型化数组的最大长度当前设置为kSmiMaxValue，具体取决于平台是:

Maximum length of a typed array in V8 is currently set to kSmiMaxValue which depending on the platform is either:

• 1Gb-32位上1字节
• 2Gb-64位上1字节

代码中的相关常量为v8::internal::JSTypedArray::kMaxLength(

Relevant constant in the code is v8::internal::JSTypedArray::kMaxLength (source).

V8团队正在努力在64位平台上进一步提高此功能，在该平台上，当前ArrayBuffer个对象可以达到Number.MAX_SAFE_INTEGER个大对象(2 ** 53-1).参见错误4153 .

V8 team is working on increasing this even further on 64-bit platforms, where currently ArrayBuffer objects can be up to Number.MAX_SAFE_INTEGER large (2**53 - 1). See bug 4153.

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