flush

问题 From JPA documentation I can see that the AUTO is the default flush mode, flush should happen before any query execution. I have tried this on spring boot jpa and I can see the flush won't happen on queries from different entities , is that expected ? even though different entity may have relation to it ( Department <--> Person here ) The flush should trigger before any query according to this article : https://vladmihalcea.com/how-do-jpa-and-hibernate-define-the-auto-flush-mode/ // this

问题 This question already has answers here : How to clear input buffer in C? (12 answers) How to clear stdin before getting new input? (4 answers) Using fflush(stdin) (6 answers) Closed 2 years ago . I'm trying to simulate a command line shell. The user inputs a shell command they want to input, e.g. /bin/pwd and the code is meant to execute it. The buffer is set to read a fixed number of chars (let's say 20 for example). In the case that the user inputs more than 20 chars, the excess characters

问题 This question already has answers here : How to clear input buffer in C? (12 answers) How to clear stdin before getting new input? (4 answers) Using fflush(stdin) (6 answers) Closed 2 years ago . I'm trying to simulate a command line shell. The user inputs a shell command they want to input, e.g. /bin/pwd and the code is meant to execute it. The buffer is set to read a fixed number of chars (let's say 20 for example). In the case that the user inputs more than 20 chars, the excess characters

问题 Under heavy load I see lot of threads getting locked when GZipping and decompressing the JSP file. The thread dump looks like below. Seems to be coming from "header.jsp" which is of size 14Kb. http-0.0.0.0-8080-304" daemon prio=3 tid=0x0000000008bcc000 nid=0x302 runnable [0xfffffd7de7bc2000] java.lang.Thread.State: RUNNABLE at java.util.zip.Deflater.deflateBytes(Native Method) at java.util.zip.Deflater.deflate(Deflater.java:306) - locked <0xfffffd7e589078e8> (a java.util.zip.ZStreamRef) at

问题 In my program, I write a file, then call an external program that reads that file. Do I need Flush(true) to make sure that the data is written entirely to disk, or is Flush() sufficient? class ExampleClass : IDisposable { private FileStream stream = File.Open("command-list.txt", FileMode.Append, FileAccess.Write, FileShare.Read); public void Execute(string command) { var buffer = Encoding.UTF8.GetBytes(command); stream.WriteByte(10); stream.Write(buffer, 0, buffer.Length); stream.Flush(true);

问题 In my program, I write a file, then call an external program that reads that file. Do I need Flush(true) to make sure that the data is written entirely to disk, or is Flush() sufficient? class ExampleClass : IDisposable { private FileStream stream = File.Open("command-list.txt", FileMode.Append, FileAccess.Write, FileShare.Read); public void Execute(string command) { var buffer = Encoding.UTF8.GetBytes(command); stream.WriteByte(10); stream.Write(buffer, 0, buffer.Length); stream.Flush(true);

问题 Because I didn't find a better way to read keystrokes on command line I'm currently using getch() . Unfortunately using getch() like this stops output on stdout : while True: handle_keystroke(getch()) Pressing buttons triggers handle_keystroke() and stdout is being printed in the terminal - line by line for each keystroke. Recommendations provided here didn't help. What do I do wrong? Btw: I do not need to use getch() . Is there a better way (e.g. using select() )? Update: (changed the title)

问题 Is there anyway I can flush iCache in x86 architecture ? Like WBINVD which will invalidate and flush all the cachelines in data cache. 回答1: According to the docs, wbinvd flushes and invalidates all caches , not just data and unified caches. (I'm not sure if that includes TLBs if you ran it with paging enabled.) What are you trying to test? L1i miss / L2 hit for code-fetch? I don't think it's possible to purposely flush just the I-cache without also flushing all levels of cache. You could

问题 I have problem with AJAX response of my PHP script... I've created "Status" div, where I want to output response of PHP script. It works good, but the response shows up only, when whole script finishes, and I would like to output each echo "live".. Here are my files: form.php <!-- left column --> <div class="col-md-6"> <!-- general form elements --> <div class="card card-primary"> <div class="card-header"> <h3 class="card-title"><?php echo $xmlData->name ?></h3> </div> <!-- /.card-header -->

问题 I've read that '\n' is preferred over 'endl' for new line in c++ because 'endl' inserts new line and flushes the stream. Please tell me what is flushing the stream ? 回答1: Flushing a stream ensures that all data that has been written to that stream is output, including clearing any that may have been buffered. Some streams are buffered to aid performance, e.g. a stream writing to disk may buffer until the content reaches a block size. 回答2: When you flush the stream you force contents of the