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  • PHP Flush: How Often and Best Practises

    - by Cory Dee
    I just finished reading this post: http://developer.yahoo.com/performance/rules.html#flush and have already implemented a flush after the top portion of my page loads (head, css, top banner/search/nav). Is there any performance hit in flushing? Is there such a thing as doing it too often? What are the best practices? If I am going to hit an external API for data, would it make sense to flush before hand so that the user isn't waiting on that data to come back, and can at least get some data before hand? Thanks to everyone in advance.

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  • Abort a slow flush to disk after write?

    - by Therealstubot
    Is there a way to abort a python write operation in such a way that the OS doesn't feel it's necessary to flush the unwritten data to the disc? I'm writing data to a USB device, typically many megabytes. I'm using 4096 bytes as my block size on the write, but it appears that Linux caches up a bunch of data early on, and write it out to the USB device slowly. If at some point during the write, my user decides to cancel, I want the app to just stop writing immediately. I can see that there's a delay between when the data stops flowing from the application, and the USB activity light stops blinking. Several seconds, up to about 10 seconds typically. I find that the app is holding in the close() method, I'm assuming, waiting for the OS to finish writing the buffered data. I call flush() after every write, but that doesn't appear to have any impact on the delay. I've scoured the python docs for an answer but have found nothing.

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  • EntityManager does not update on flush()

    - by Sara
    Java EJB's EntityManager does not update data from a Consumer. A Consumer logs into a shop, buys some stuff and wants to look at his shopping-history. Everything is displayed but his last purchase. If he logs out and in, it shows. I have used JPA to persist buys/purchases (that are mapped to the Consumer)to DB. It seems like purchases from this session can't be detected. Code: public Buys buyItem(Consumer c, int amount) { Buys b = new Buys(); b.setConsumerId(c); b.setContent("DVD"); b.setPrice(amount); em.persist(b); em.flush(); return b; } public Collection getAllBuysFromUser(Consumer consumer) { Collection collection = consumer.getBuysCollection(); return collection; } Help!? Flush does not do the trick...

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  • Flush separate Castle ActiveRecord Transaction, and refresh object in another Transaction

    - by eanticev
    I've got all of my ASP.NET requests wrapped in a Session and a Transaction that gets commited only at the very end of the request. At some point during execution of the request, I would like to insert an object and make it visible to other potential threads - i.e. split the insertion into a new transaction, commit that transaction, and move on. The reason is that the request in question hits an API that then chain hits another one of my pages (near-synchronously) to let me know that it processed, and thus double submits a transaction record, because the original request had not yet finished, and thus not committed the transaction record. So I've tried wrapping the insertion code with a new SessionScope, TransactionScope(TransactionMode.New), combination of both, flushing everything manually, etc. However, when I call Refresh on the object I'm still getting the old object state. Here's some code sample for what I'm seeing: Post outsidePost = Post.Find(id); // status of this post is Status.Old using (TransactionScope transaction = new TransactionScope(TransactionMode.New)) { Post p = Post.Find(id); p.Status = Status.New; // new status set here p.Update(); SessionScope.Current.Flush(); transaction.Flush(); transaction.VoteCommit(); } outsidePost.Refresh(); // refresh doesn't get the new status, status is still Status.Old Any suggestions, ideas, and comments are appreciated!

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  • Is there anyway to programmably flush the buffer in log4net

    - by Henrik Stenbæk
    Hi I'm using log4net with AdoNetAppender. It's seems that the AdoNetAppender has a Flush method. Is there anyway I can call that from my code? I'm trying to create an admin page to view all the entries in the database log, and I will like to setup log4net with bufferSize=100 (or more), then I want the administrator to be able to click an button on the admin page to force log4net to write the buffered log entries to the database (without shutting down log4net). Is that possible?

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  • Bash: How to flush output to a file while running

    - by noam
    I have a small script, which is called daily by crontab using the following command: /homedir/MyScript &> some_log.log The problem with this method is that some_log.log is only created after MyScript finishes. I would like to flush the output of the program into the file while it's running so I could do things like tail -f some_log.log and keep track of the progress, etc.

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  • Empty or "flush" a file descriptor without read()?

    - by Teddy
    (Note: This is not a question of how to flush a write(). This is the other end of it, so to speak.) Is it possible to empty a file descriptor that has data to be read in it without having to read() it? You might not be interested in the data, and reading it all would therefore waste space and cycles you might have better uses for. If it is not possible in POSIX, do any operating systems have any non-portable ways to do this? UPDATE: Please note that I'm talking about file descriptors, not streams.

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  • How to flush output after each `echo` call?

    - by CuSS
    Hi all! I've a php script that only produces logs to the client. When I echo something, i wan't it to be transfered to client on-the-fly. (Because while the script is processing, the page is blank) I had already played arround with ob_start() and ob_flush(), but they didn't worked. What's the best solution? PS: it is a little dirty to put a flush at the end of the echo call... EDIT: Neither the Answers worked, PHP or Apache Fault? Thanks in advance, José Moreira Sorry for my bad English. ;)

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  • NHibernate flush should save only dirty objects

    - by Emilian
    Why NHibernate fires an update on firstOrder when saving secondOrder in the code below? I'm using optimistic locking on Order. Is there a way to tell NHibernate to update firstOrder when saving secondOrder only if firstOrder was modified? // Configure var cfg = new Configuration(); var configFile = Path.Combine( AppDomain.CurrentDomain.BaseDirectory, "NHibernate.MySQL.config"); cfg.Configure(configFile); // Create session factory var sessionFactory = cfg.BuildSessionFactory(); // Create session var session = sessionFactory.OpenSession(); // Set session to flush on transaction commit session.FlushMode = FlushMode.Commit; // Create first order var firstOrder = new Order(); var firstOrder_OrderLine = new OrderLine { ProductName = "Bicycle", ProductPrice = 120.00M, Quantity = 1 }; firstOrder.Add(firstOrder_OrderLine); // Save first order using (var tx = session.BeginTransaction()) { try { session.Save(firstOrder); tx.Commit(); } catch { tx.Rollback(); } } // Create second order var secondOrder = new Order(); var secondOrder_OrderLine = new OrderLine { ProductName = "Hat", ProductPrice = 12.00M, Quantity = 1 }; secondOrder.Add(secondOrder_OrderLine); // Save second order using (var tx = session.BeginTransaction()) { try { session.Save(secondOrder); tx.Commit(); } catch { tx.Rollback(); } } session.Close(); sessionFactory.Close();

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  • ASP -response-flush-flushes-partial-data

    - by Anshu
    I am developing a web app with an ASP server side and I use an iframe for data push. An ASP handler flushes every once in a while some javascript to the iframe: context.Response.Write("<script language='javascript'>top.update('lala');</script>"); context.Response.Flush(); My problem is that sometimes, when I receive the data, I don't get the full text. For example I will receive this : update('lala'); One workaround I have is to have a thread flushing '..........' every 500ms. (Then I will receive script...... which will complete my javascript.) However I am sure there must be a way to have Response.Flush() sending the whole chunk of data. Does someone have an idea on how to use properly Response.Flush() ? Thank you!

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  • Does binarywriter.flush() also flush the underlying filestream object?

    - by jacob sebastian
    I have got a code snippet as follows: Dim fstream = new filestream(some file here) dim bwriter = new binarywriter(fstream) while not end of file read from source file bwriter.write() bwriter.flush() end while The question I have is the following. When I call bwriter.flush() does it also flush the fstream object? Or should I have to explicitly call fstream.flush() such as given in the following example: while not end of file read from source file bwriter.write() bwriter.flush() fstream.flush() end while A few people suggested that I need to call fstream.flush() explicitly to make sure that the data is written to the disk (or the device). However, my testing shows that the data is written to the disk as soon as I call flush() method on the bwriter object. Can some one confirm this?

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  • Why does flush dns often fail to work?

    - by Sharen Eayrs
    C:\Windows\system32>ipconfig /flushdns Windows IP Configuration Successfully flushed the DNS Resolver Cache. C:\Windows\system32>ping beautyadmired.com Pinging beautyadmired.com [xxx.45.62.2] with 32 bytes of data: Reply from xxx.45.62.2: bytes=32 time=253ms TTL=49 Reply from xxx.45.62.2: bytes=32 time=249ms TTL=49 Reply from xxx.45.62.2: bytes=32 time=242ms TTL=49 Reply from xxx.45.62.2: bytes=32 time=258ms TTL=49 Ping statistics for xxx.45.62.2: Packets: Sent = 4, Received = 4, Lost = 0 (0% loss), Approximate round trip times in milli-seconds: Minimum = 242ms, Maximum = 258ms, Average = 250ms My site should point to xx.73.42.27 I change the name server. It's been 3 hours. It still points to xxx.45.62.2 Actually what happen after we change name server anyway? Wait for what? I already flush dns. Why it still points to the wrong IP? Also most other people that do not have the DNS cache also still go to the wrong IP

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  • VMPlayer does not flush all outputs to serial port

    - by eddyxu
    I am debugging a Linux kernel in the VMPlayer on Ubuntu 12.04 configured a serial port to a file to see the debug information. However, each time when the kernel panics, only the backtrace stack were printed out instead of all the booting messages. This does not happend on VMPlayer Fusion. My .vmx file: serial1.present = "TRUE" serial1.fileType = "file" serial1.fileName = "~/tmp/serial.out" serial1.startConnected = "TRUE" msg.serial.file.open = "Replace" serial1.yieldOnMsrRead = "TRUE" My /etc/default/grub: GRUB_CMDLINE_LINUX_DEFAULT="quiet" GRUB_CMDLINE_LINUX="find_preseed=/preseed.cfg noprompt console=tty0 console=ttyS1,115200n8" How could I flush every message to both tty0 and ttyS1?

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  • MySQL blocking new connections, and mysqladmin flush-hosts

    - by aidan
    I'm running MySQL on a remote server, and it suddenly started rejecting all connections: $ mysql -h 192.168.1.10 -u root -p ERROR 1129 (00000): Host 'web' is blocked because of many connection errors; unblock with 'mysqladmin flush-hosts' So, I try this flush-hosts command... $ mysqladmin flush-hosts -h 192.168.1.10 -u root -p mysqladmin: connect to server at '192.168.1.10' failed error: 'Host 'web' is blocked because of many connection errors; unblock with 'mysqladmin flush-hosts'' I.e. it's blocking the very un-blocking tool it recommends. Am I doing it wrong, or will I have to resort to ssh/cpanel/physical access?

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  • Perl - can't flush STDOUT or STDERR

    - by Jim Salter
    Perl 5.14 from stock Ubuntu Precise repos. Trying to write a simple wrapper to monitor progress on copying from one stream to another: use IO::Handle; while ($bufsize = read (SOURCE, $buffer, 1048576)) { STDERR->printflush ("Transferred $xferred of $sendsize bytes\n"); $xferred += $bufsize; print TARGET $buffer; } This does not perform as expected (writing a line each time the 1M buffer is read). I end up seeing the first line (with a blank value of $xferred), and then the 7th and 8th lines (on an 8MB transfer). Been pounding my brains out on this for hours - I've read the perldocs, I've read the classic "Suffering from Buffering" article, I've tried everything from select and $|++ to IO::Handle to binmode (STDERR, "::unix") to you name it. I've also tried flushing TARGET with each line using IO::Handle (TARGET-flush). No dice. Has anybody else ever encountered this? I don't have any ideas left. Sleeping one second "fixes" the problem, but obviously I don't want to sleep a second every time I read a buffer just so my progress will output on the screen! FWIW, the problem is exactly the same whether I'm outputting to STDERR or STDOUT.

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  • How can I flush the output of disp in Octave?

    - by Nathan Fellman
    I have a program in Octave that has a loop - running a function with various parameters, not something that I can turn into matrices. At the beginning of each iteration I print the current parameters using disp. The first times I ran it I had a brazillion warnings, and then I also got these prints. Now that I cleaned them up, I no longer see them. My guess is that they're stuck in a buffer, and I'll see them when the program ends or the buffer fills. Is there any way to force a flush of the print buffer so that I can see my prints?

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  • DB2 Transaction log is full. How to flush / clear it?

    - by Mestika
    Hi, I’m working on a experiment regarding to a course I’m taking about tuning DB2. I’m using the EC2 from Amazon (aws) to conduct the experiment. My problem is, however, that I have to test a non-compression against row-compression in DB2 and to do that I’ve created a bsh file that run those experiments. But when I reach to my compression part I get the error ”Transaction log is full”; and no matter how low I set the inserts for it is complaining about my transaction log. I’ve scouted Google for a day now trying to find some way to flush / clear the log or just get rit of it, i don’t need it. I’ve tried to increase the size but nothing has helped. Please, I hope someone has an answer to solve this frustrating problem Thanks - Mestika

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  • PHP Output buffer flush issue on Apache/Linux

    - by Iiro Vaahtojärvi
    Hi, I'm running into issues with the PHP output buffer flushing on my Linux web server. The output buffer is maintained correctly and all the right data is pushed to it in my code, but the usual flushing mechanisms won't flush it to the browser. I have tried everything posted here: http://php.net/manual/en/function.flush.php but no success so far. I got a small script from php.net to test it: <?php ob_start(); for($i=0;$i<70;$i++) { echo 'printing...<br />'; ob_get_flush(); flush(); usleep(300000); } ?> This should print "printing..." to the browser 70 times, one line every three seconds. This works fine on my other testing environment which is based on Windows (still using apache, XAMPP package), but on my Linux server it doesn't. It waits for the script to finish before giving anything to the browser, basically ignoring the whole flush command. If anyone has experienced this before or knows of anything that could help (be it server configuration or adjustment to code) it would be greatly appreciated!

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  • Flush mod_pagespeed cache in Debian

    - by Ivar
    I need a way to flush the mod_pagespeed cache while developing. According to mod_pagespeed documents, I should run the following command: sudo touch /var/mod_pagespeed/cache/cache.flush In Debian it's "su" instead of "sudo". However, it doesn't work for me; there's no "touch" command, nor is there any "cache.flush" file in the defined directory. Have I missed something? You kick-ass Linux users, please be humble - I'm pretty new to these stuff. Thank you in advance!

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  • Mysql- “FLUSH TABLES WITH READ LOCK” started automatically

    - by mingyeow
    I would like to understand how this happened. I was running a query that would take a long time, but should not lock up any table. However, my dbs were practically down - it seems like it was being locked up by "FLUSH TABLES WITH READ LOCK" 03:21:31 select type_id, count(*) from guid_target_infos group by type_id 02:38:11 select type_id, count(*) from guid_infos group by type_id 02:24:29 FLUSH TABLES WITH READ LOCK But i did not start this command. can someone tell me why it was started automatically?

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  • How to "flush tor circuit"

    - by Jack
    On Windows I have used XBBrowser, which provides a custom version of Firefox suited to using Tor. XBBrowser provides a button, flush tor circuit, which will setup an entirely new connection and exit node. I am wondering how to do the equivalent thing on Linux. ALl I can do is restart tor, which does not seem to make any difference. So, on Linux, how would I flush the circuit?

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  • How to tell GDB to flush the stdio of the program being debugged

    - by Yorkwar
    The stdio is usually buffered. When I hit a breakpoint and there's a printf before the breakpoint, the printed string may still be in the buffer and I can not see it. I know I can flush the stdio by adding some flush code in the program. Without doing this, is there any way to tell GDB to flush the stdio of the program being debugged after GDB stops? This way is more friendly when debugging a program.

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