managed switch vs unmanaged switch

oversold sales.OpenVZ no swap, the memory isolated through the free command, some of which are in fact the swap of the host, just as the VPS as physical memory.No non-oversold OpenVZ VPS.512M of Xen, its memory performance is better than 1G OpenVZ VPS, or even far beyond.OpenVZ the memory is exhausted, the system can only be restarted, because the remote SSH connection cannot be established. and Xen, and swap is available, usually not to restart.It seems that Xen is almost over OpenVZ, the pric

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Event distribution mechanism New event distribution mechanism:During event processing in version 2.x, events to be triggered are handed over to the proxy (delegate) for processing, events are received by ontouchbegan in the proxy, and finally the event response is completed. In the new event distribution mechanism, you only need to create an event listener to implement various trigger logic and then add it to the event distributor._eventDispatcherAll Event Listeners can be centrally

When the program contains multiple views and you need to switch between them, you can use UINavigationController or ModalViewController. UINabigationController switches multiple views through the wizard bar. If the number of views is relatively small and the display field is full screen, it is more appropriate to use ModalViewController (for example, the view that requires user input information will be automatically returned to the previous view afte