我仅在iOS 8上看到相同的问题。在任何版本的iOS 7上都不会发生这种情况。在模拟器上，它的132kb在设备上是144kb。

I'm seeing the same issue on iOS 8 ONLY. It doesn't happen on any version of iOS 7. On simulator its 132kb, on a device its 144kb.

这似乎与以下问题有关：

It seem's to be related to this issue:

https://github.com/AFNetworking/ AFNetworking / issues / 2314

在此示例中，我正在使用nsurlsession执行http get。如果您遇到的地方不发送保持活动状态，即google.com，则不会分配这些kb。但是，如果您碰到发送保持活动状态的地方，则会发送。

I'm performing a http get using nsurlsession in this example. If you hit a place that doesn't send keep-alive, ie google.com, it wont malloc those kb. But if you hit a place that sends keep-alive, it will.

NSString * url = [NSString stringWithFormat:@"%@%.20f", @"http://someplace.com/?test=", (double)[[NSDate date] timeIntervalSince1970];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:[NSURL URLWithString:url]];
[request setHTTPMethod:@"GET"];
[[[NSURLSession sharedSession] dataTaskWithRequest:request completionHandler:nil] resume];