写入NSOutputStream会导致高CPU使用率

Question

在检测我的应用程序时,我发现在将数据写入输出流时CPU使用率跃升至90%.具体来说,当网络速度非常高时.当我用Timer仪器配置它时,发现大多数cpu用于NSStream委托调用.请帮助优化编写技术以降低CPU使用率.

- (void)stream:(NSStream *)aStream handleEvent:(NSStreamEvent)eventCode
{
switch (eventCode) {

    case NSStreamEventOpenCompleted: {
        _isConnected = YES;
        if([self.delegate respondsToSelector:@selector(isFTPConnectionFoundForUpload:)])
            [self.delegate performSelector:@selector(isFTPConnectionFoundForUpload:) withObject:_isConnected?@"YES":@"NO"];
    } break;

    case NSStreamEventHasSpaceAvailable: {

            bytesWritten = [self.producerStream write:&self.buffer[0] maxLength:512];
            if (bytesWritten == -1) {
                [self stopSendWithStatus:@"Network write error"];
            }

    } break;

    case NSStreamEventErrorOccurred: {
        NSLog(@"producer stream error %@", [aStream streamError]);
        [self stopSendWithStatus:@"Stream open error"];
    } break;
    case NSStreamEventEndEncountered: {

    } break;
    default: {

    } break;
}

}