Measure the necessary time and see yourself. As you say it is absolutely file system dependent. long t1 = System.currentTimeMillis(); …Your File.exists call long t2 = System.currentTimeMillis(); System.out.println(“time: ” + (t2 – t1) + ” ms”); You will see that it will always give you different results, since it depends also on the way your … Read more
Technically it is possible, but it would require saving all the system-allocated resources state too – like file descriptors for example and then restoring them. So it’s a challenging task. The easiest way to achieve what you want is to use a virtual machine like VMWare. When you pause it you actually save the whole … Read more
Short answer: RPC is the protocol. The socket provides access to the transport to implement that protocol. RPC is the service and protocol offered by the operating system to allow code to be triggered for running by a remote application. It has a defined protocol by which procedures or objects can be accessed by another … Read more
Blocking may or may not be the same as synchronous, depending on the context. When we talk about method calls, then a synchronous call can also be said to be blocking (I’ll get back to this in a bit), because the thread calling the method cannot proceed forward until the method returns. The antonym in … Read more
The Ruby IO documentation is not 100% clear on how this buffering works, but this is what you can extract from the documentation: Ruby IO has its own internal buffer In addition to that the underlying operating system may or may not further buffer data. The relevant methods to look at: IO.flush: Flushes IO. I … Read more
Here is a short, but nice socket tutorial. You have to distinguish the client and server side. I cannot tell for MySQL, but typically the server side is implemented so, that for a connection, a new thread is processing the requests. A connection pool is there to minimize socket opening overhead. Typically, you do not … Read more
The following statement in your question is wrong: What I know is that a part of the physical memory is reserved to communicate with the hardware A part of the physical memory is not reserved for communication with the hardware. A part of the physical address space, to which the physical memory and memory mapped … Read more
When a system uses virtual memory, the kernel uses virtual memory as well. Windows will use the upper 2GB (or 1GB if you’ve specified the /3GB switch in the Windows bootloader) for its own use. This includes kernel code, data (or at least the data that is paged in — that’s right, Windows can page … Read more
In spite of the historical interchanging of these two terms, they indicate different things. They are both methods for managing moving data in memory to another storage device, called a backing store (often a hard drive), but they use different methods of doing so. Swapping involves the moving of a process’s entire collection data in … Read more
Using wait() or waitpid() It is not possible on Unix and derivatives using POSIX functions like wait() and waitpid(). The exit status information returned consists of two 8-bit fields, one containing the exit status, and the other containing information about the cause of death (0 implying orderly exit under program control, other values indicating that … Read more