Databases
StackOverflow2013
Postsdbo
PO
 

Note that there are some explanatory texts on larger screens.

plurals
  1. PO
    primarykey
    data
    text
    <h2>Experiment:</h2> <p><strong>Significant changes from original code:</strong></p> <p>1) Using implicit_flush and all buffers are flushed before doing anything.<br> 2) Instead of outputting just a space, the code outputs the iteration number and 1023 bytes of other data to tell the browser that we have good amount of output to display. A normal known trick.<br> 3) Along with saving the time in the output text file, it also saves the total iterations that the code ran.</p> <p><strong>The code used:</strong></p> <pre><code>&lt;?php // Tricks to allow instant output @ini_set('implicit_flush', 1); for ($i = 0; $i &lt; ob_get_level(); $i++) ob_end_flush(); ob_implicit_flush(1); //Your Code starts here ignore_user_abort(true); set_time_limit(0); $begin_time = microtime(true); $elapsed_time = 0; while(!connection_aborted()) { //this I changed, so that a looooong string is outputted echo $i++.str_repeat(' ',1020).'&lt;br/&gt;'; flush(); usleep(1000000); } $elapsed_time = microtime(true) - $begin_time; $timer_seconds = $elapsed_time; //10 seconds //Writes to file the number of ITERATIONS too along with time $fp = fopen('4765107.txt', 'w'); fwrite($fp, 'Time Elapsed: '.$timer_seconds); fwrite($fp, "\nIterations: ".$i); fclose($fp); ?&gt; </code></pre> <p><strong>Live Demo:</strong></p> <ul> <li><p>Now, here is the code to run: <a href="http://work.sktnetwork.com/so/4765107.php" rel="nofollow">http://work.sktnetwork.com/so/4765107.php</a></p></li> <li><p>And here is the .TXT file it generates: <a href="http://work.sktnetwork.com/so/4765107.txt" rel="nofollow">http://work.sktnetwork.com/so/4765107.txt</a></p></li> </ul> <hr> <h2>What I got:</h2> <p>1) When code is run for 10 iterations and STOP button on browser is clicked, the output file shows 13 iterations with ~ 13.01 seconds taken.</p> <p>2) When code is run for 20 iterations and STOP button on browser is clicked, the output file shows 23 iterations with ~ 23.01 seconds taken.</p> <hr> <h2>Inferences &amp; Conclusion:</h2> <p>1) The script actually does NOT stops when the STOP button is clicked but after 2-4 seconds of clicking it. So, there are more iterations that what appears in the browser.</p> <p>2) The number of iterations is SAME as the number of seconds it takes to execute, as shown in output file.</p> <p>Therefore, there is no error and apparently no bugs, it's just the latency time between clicking the STOP button and the script actually stopping.</p> <hr> <p><strong>Notes:</strong></p> <p>1) Server: A Linux VPS.<br> 2) Clients tested: Firefox and Chrome.<br> 3) <strong>As the script ends 2-4 seconds after STOP is clicked, it takes around 3-4 seconds for the output file to be updated for the current test.</strong></p>
    singulars
    1. This table or related slice is empty.
    1. POCan you figure out this PHP timing issue?
      singulars
      1. PTQuestion
    1. PTAnswer
    1. This table or related slice is empty.
    1. USshamittomar
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. POCan you figure out this PHP timing issue?
      singulars
      1. PTQuestion
    1. This table or related slice is empty.
    1. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    2. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    3. VO
      singulars
      1. PO
      1. This table or related slice is empty.
      1. VTUpMod
    1. COThank you for your answer and length post, I've learnt a lot!
      singulars
      1. PO
      1. USAbs
    2. CO@Abs, I am happy to note that it helped you learning. Please consider accepting the answer, if you like it.
      singulars
      1. PO
      1. USshamittomar
    3. COTo be consistent you should have used `++$i` on your `echo` line in the code - it makes the output iteration value 1 based the same way your stored value is. Your "what I got" section should read 11/13 and 21/23 (if you're using 1 based counting) or 10/12 and 20/22 (if you're using zero based).
      singulars
      1. PO
      1. USRudu
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload