flush | 易学教程

Python sys.stderr flush frequency

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问题 How often does sys.stderr flush its buffer, and is this standard among different environments? >>> import sys >>> sys.__stderr__ <open file '<stderr>', mode 'w' at 0x2b4fcb7ac270> I see that it is just a standard file type, but I don't know what value of buffering it's supposed to be. dir() does not seem to yield any useful information either. 回答1: On Python 2, I can't find where in the documentation sys.stderr 's buffering is specified. I'd expect the same behaviour as stderr in C that is

ZZ PHP立即刷新缓存（输出）的方法

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PHP立即刷新缓存（输出）的方法转自 http://www.piaoyi.org/php/php-ob_flush-flush.html 正文：近日，飘易在写一段php程序，需要用到立即刷新缓存，输出到浏览器的效果。本来，利用 ob_flush() 和 flush() 两个函数就可以立即输出了。但我在实际应用中，发现不同的服务器之间是不兼容的。比如，我在本地的环境（WIN XP+apache2+PHP5.2版本）下，利用下面的代码就可以直接达到我要的立即输出的效果 <?php ob_start(); //打开输出缓冲区 for($i=0;$i<1000;$i++){ echo $i."<br>"; ob_flush(); flush(); } ?> ：但当我把这样的代码上传到我的服务器（WIN 2003 SERVER + APACHE + PHP5.2.5）后，上面的代码并不能立即输出。飘易看了下手册，关于 ob_flush() 和 flush() 两个函数，我的理解是这样的： “ob_flush 是刷新PHP自身的缓冲区。 flush 只有在PHP做为apache的Module(handler或者filter)安装的时候，才有实际作用，它是刷新WebServer(可以认为特指apache)的缓冲区，即刷新到浏览器输出。有些Apache的模块，比如mod_gzip

In bash, How can I force a flush of an incomplete line printed to the terminal

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问题 I'm writing a script which does something like the following: echo -n "Doing stuff, wait for it... " do_stuff (($?==0)) && echo SUCCESS || echo FAILURE Excuse the poor bash skills. Anyway, the problem is that the first part of the line doesn't get printed until do_stuff is done - while it is important to me the user know what I'm running next. It is also important to me, since I'm pedantic, not to print a newline. So, the text is in the buffer and doesn't get flushed. This question is very

Python's print function that flushes the buffer when it's called? [duplicate]

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问题 This question already has answers here : Closed 9 years ago . Possible Duplicates: How to flush output of Python print? unbuffered stdout in python (as in python -u) from within the program I have the following code to flushing out the output buffer. print 'return 1' sys.stdout.flush() Can I setup the print function so that it automatically flushes the buffer when it's called? 回答1: You can start python in unbuffered mode using the -u flag, e.g. python -u script.py or #!/usr/bin/env python -u

How do I flush a 'RandomAccessFile' (java)?

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问题 I'm using RandomAccessFile in java: file = new RandomAccessFile(filename, "rw"); ... file.writeBytes(...); How can I ensure that this data is flushed to the Operating System? There is no file.flush() method. (Note that I don't actually expect it to be physically written, I'm content with it being flushed to the operating system, so that the data will survive a tomcat crash but not necessarily an unexpected server power loss). I'm using tomcat6 on Linux. 回答1: The only classes that provide a

Flush disk write cache from Windows CLI

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问题 Does anyone know how to flush the disk write cache data from the cache manager for the current directory (or any given file or directory, for that matter), from a Windows command line? 回答1: I found the SysInternals Sync worked well for me - although it flushes ALL cache, not just for the specific folder. Example of usage: IF EXIST Output RD /S /Q Output && Sync && MD Output By default it flushes all cached data for all drives - you can specify command-line options to restrict which drives but

can you force flush output in perl

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问题 I have the following two lines in perl: print "Warning: this will overwrite existing files. Continue? [y/N]: \n"; my $input = <STDIN>; The problem is that the print line does not get executed before the perl script pauses for input. That is, the perl script just seems to stop indefinitely for no apparent reason. I'm guessing that the output is buffered somehow (which is why I put the \n in, but that doesn't seem to help). I'm fairly new to perl, so I would appreciate any advise on how to get

Go Flush() doesn't work

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问题 Please, check this gist and tell me, what's wrong? Why I don't see my messages? The gist: https://gist.github.com/cnaize/895f61b762a9f5ee074c If simple, I have two functions: func send(param martini.Params, r render.Render) { Ct.Msgs <- param["msg"] fmt.Printf("Sent: %v", param["msg"]) r.JSON(http.StatusOK, Response{"status": "ok"}) } And watch function: func watch(rw http.ResponseWriter, r render.Render) { var msg string ok := true for ok { select { case msg, ok = <-Ct.Msgs: rw.Write([]byte

How do I “flush” a TCP Client Buffer?

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问题 I've pulled from several examples to setup a Full Duplex C# TCP Client connected to a server. The basic concept is that the client and server both send/receive messages (commands and events). Therefore, I've developed a FullDuplexSocket class that exposes a Send method to send messages to the server and a event handler to receive messages from the server. Everything works except I can't seem to flush the buffer of messages received from the server. Each time the server sends a new message,

How to flush gstreamer pipeline

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问题 Case Reading from a file continuously and feeding to appsrc element. Source - appsrc I have a GStreamer pipeline in PLAYING state. Now would want the pipeline to flush / clean when I press a button that means appsrc queue should be cleared. The playback should start from whatever buffers are now added to / or were added after flush. Issue the APIs I used returned false. I am not able to flush. fprintf(stderr, "The flush event start was <%d>",gst_element_send_event(GST_ELEMENT (pipe), gst