Please anyone help me to solved my case :
What should I add to my code, if the output from the code below is insert on the table in POSTGRES, and row that will be inserted are more than 1000 rows. When I running using this code below it appears the error :
Fatal error: Maximum execution time of 60 seconds exceeded in D: \ xampp \ htdocs \ BillingDeliveryInfo \ page2.php on line 45
Because it took so long query maybe
while($msisdn = pg_fetch_row($qaccount)){
if ($msisdn[4]==2){
$insert1="insert into delin_bdi_rf
values ('$msisdn[1]',
'$m1[1] $msisdn[1] $m1[2] $msisdn[2] $m1[3] $msisdn[3] $m1[4]',
CURRENT_DATE);";
}else{
$insert2="insert into delin_bdi_rf
values ('$msisdn[1]',
'$m2[1] $msisdn[1] $m2[2] $msisdn[3] $m2[3]',
CURRENT_DATE);";
}
$qwer=$insert1.$insert2;
$n=pg_query($qwer);
}
Try adding this in the beginning:
ini_set('max_execution_time', 300); //300 seconds = 5 minutes
It increases maximum execution time of script.
Related
I have the database of 5000 users.Already there is cron job running of Once in A Week.
Initially when users were among 100's things was working fine. Now when users reached to 5000 then what happening is Cron job starts to run for some 500-600 users and breaks down. I researched it and came to the conclusion that since HTTP follow stateless protocol, so whenever any new request comes then cron job break down in between. Now my question is How can I be able to run the Cron Job for all 5000 users without break down. Please help me.
I would firstly check your PHP error logs as you may be hitting time and memory limits. If you are performing database queries I would also check the logs to see if any limits are being hit.
PHP Memory Limit Increase
Increasing the memory limit will allow your script to run for longer if it currently running out of memory.
Option One
Update your php.ini file. Change 256 to suit your requirements.
php_value memory_limit 256MB
Option Two
Add ini_set('memory_limit', nM) to increase the memory limit, again change 256 to suit your requirements:
ini_set('memory_limit','256M');
PHP Execution Limit Increase
Add set_time_limit(n) to your PHP file to increase the current execution timeout (changing 300 to suit your requirements):
ini_set('max_execution_time', 300); //300 seconds = 5 minutes
Split Up Database Results (Batches)
If you are performing a query that returns a large number of rows, it could be timing out. You can try implementing the following example logic, which splits a big query into smaller chunks using limit and offset.
// Get total rows count
$total_rows = SELECT count(id) FROM users;
// Set a block size
$block_size = 300;
// Init starting offset
$block_offset = 0;
for($block = $block_offset; $block < $total_rows; $block = $block + $block_size) {
// Query
$data = SELECT * FROM table LIMIT $block_size OFFSET $block_offset;
// Loop through each row and process here
foreach($data as $row) {
.. code here
// You can also echo out something here so script is returning some data. Sometimes if nothing is sent back for a while it can cause issues (not generally for a cron though) e.g.
echo 'Done block ' . $block;
}
// Update block offset, so offset increments by block size (300)
$block_offset = $block_offset + $block_size ;
}
In Short: How to break the code after the code takes more than 53 seconds to execute, something like this:
while (5 < 200)
{
// do some work here, which will take around 1-6 seconds
if (code this loop is running for more than 53 seconds)
break;
}
If you want to know, why i want to do this:
Ok, this is What I am doing: I am copying data from 7 JSON pages on the web and inserting them into my MySQL database.
The code is something like this:
$start_time = microtime(TRUE); // Helps to count PHP script execution time
connect to database
$number = get inserted number into database
while ($number > ($number+20) )
{
7 Open JSON File link like this - "example.com/$number?api=xxxyyzz"
Use Prepared PDO statements to insert data into MySQL
}
// Code to count PHP script execution time
$end_time = microtime(TRUE);
$time_taken = $end_time - $start_time;
$time_taken = round($time_taken,5);
echo '<p>Page generated in '.$time_taken.' seconds.</p>';
So in my case, It takes around 5.2 seconds to complete one whole loop of adding all data. But some JSON files are empty, so it takes only 1.4 second to complete 1 loop, if they are empty.
So like that, I want to complete millions of loops (add Data from millions of JSON files). So if my code runs for 24/7, it will take me 1 month to complete my task.
But after the code runs for 90 seconds, i get this error:
I am using a CRON job to do the task. And looks like server gives the same error to CRON job.
So, I want to do the CRON job to run every 1 minute, so I do not get timed out error.
But I am afraid of this: What If the script added data in half rows and 1 mintue gets over, and it do not add data into other half rows. Then after the starting on the new minute, the code start from the next $number.
So, If i can break; out of the loop after 53 seconds (If the code starts another loop at 52 seconds, then break at the end of it, that will be around 58-59 seconds).
I mean, i will put the break; code just before the loop end (before }). So i do not exit the loop, while the data got inserted into half of the rows.
I guess that your PHP's max_execution_time is equal to 90 seconds, you can specify max_execution_time by set_time_limit, but I don't think it is a good approach for this.
Have a try pcntl or pthreads, it would save you a lot of time.
I have large MySQL query (1.8M rows, 25 columns) and I need to make 2 dimensional array from it (memory table based on primary key).
Code works as expected, but $table creation takes a long time in PHP7.0.
What is the reason why PHP7.0 performs so much worse? My primary interest is in mysqli.
Thank you for any insights - PHP7 would save me much memory if I can fix performance.
mysqli code snippet
$start = microtime(true);
$vysledek = cluster::query("SELECT * FROM `table` WHERE 1");
$query_time = (microtime(true) - $start);
$start_fetch = microtime(true);
while($zaznam = mysqli_fetch_assoc ( $vysledek )){
$fetch_time+= (microtime(true) - $start_fetch);
$start_assign = microtime(true);
$table[$zaznam['prikey']] = $zaznam;
$assign_time+= (microtime(true) - $start_assign);
$start_fetch = microtime(true);
}
$total_time+= (microtime(true) - $start);
echo round($assign_time, 2).' seconds to set the array values\n';
echo round($query_time, 2).' seconds to execute the query\n';
echo round($fetch_time, 2).' seconds to fetch data\n';
echo round($total_time, 2).' seconds to execute whole script\n';
echo "Peak Memory Usage:".round(memory_get_peak_usage(true)/(1024 * 1024), 2)." MB\n";
mysqli results
Deb 7 PHP 5.4 mysqlnd 5.0.10
1.8 seconds to set the array values
8.37 seconds to execute the query
13.49 seconds to fetch data
24.42 seconds to execute whole script
Peak Memory Usage:8426.75 MB
Deb 8 PHP 5.6 mysqlnd 5.0.11-dev
1.7 seconds to set the array values
8.58 seconds to execute the query
12.55 seconds to fetch data
23.6 seconds to execute whole script
Peak Memory Usage: 8426.75 MB
Deb 8 PHP 7.0 mysqlnd 5.0.12-dev
0.73 seconds to set the array values
8.63 seconds to execute the query
126.71 seconds to fetch data
136.46 seconds to execute whole script
Peak Memory Usage:7394.27 MB
Deb 8 PHP 7.0 mysqlnd 5.0.12-dev extended benchmarking
I have extended benchmarking for section fetch to report every 100k lines with following results:
Lines fetched 100000 in 1.87s
Lines fetched 300000 in 5.24s
Lines fetched 500000 in 10.97s
Lines fetched 700000 in 19.17s
Lines fetched 900000 in 29.96s
Lines fetched 1100000 in 43.03s
Lines fetched 1300000 in 58.48s
Lines fetched 1500000 in 76.47s
Lines fetched 1700000 in 96.73s
Lines fetched 1800000 in 107.78s
DEB8 PHP7.1.0-dev libclient 5.5.50
1.56 seconds to set the array values
8.38 seconds to execute the query
456.52 seconds to fetch data
467.68 seconds to execute whole script
Peak Memory Usage:8916 MB
DEB8 PHP7.1.0-dev libclient 5.5.50 extended benchmarking
Lines fetched 100000 in 2.72s
Lines fetched 300000 in 15.7s
Lines fetched 500000 in 38.7s
Lines fetched 700000 in 71.69s
Lines fetched 900000 in 114.8s
Lines fetched 1100000 in 168.18s
Lines fetched 1300000 in 231.69s
Lines fetched 1500000 in 305.36s
Lines fetched 1700000 in 389.05s
Lines fetched 1800000 in 434.71s
DEB8 PHP7.1.0-dev mysqlnd 5.0.12-dev
1.51 seconds to set the array values
9.16 seconds to execute the query
261.72 seconds to fetch data
273.61 seconds to execute whole script
Peak Memory Usage:8984.27 MB
DEB8 PHP7.1.0-dev mysqlnd 5.0.12-dev extended benchmarking
Lines fetched 100000 in 3.3s
Lines fetched 300000 in 13.63s
Lines fetched 500000 in 29.02s
Lines fetched 700000 in 49.21s
Lines fetched 900000 in 74.56s
Lines fetched 1100000 in 104.97s
Lines fetched 1300000 in 140.03s
Lines fetched 1500000 in 180.42s
Lines fetched 1700000 in 225.72s
Lines fetched 1800000 in 250.01s
PDO code snippet
$start = microtime(true);
$sql = "SELECT * FROM `table` WHERE 1";
$vysledek = $dbh->query($sql, PDO::FETCH_ASSOC);
$query_time = (microtime(true) - $start);
$start_fetch = microtime(true);
foreach($vysledek as $zaznam){
$fetch_time+= (microtime(true) - $start_fetch);
$start_assign = microtime(true);
$table[$zaznam['prikey']] = $zaznam;
$assign_time+= (microtime(true) - $start_assign);
$start_fetch = microtime(true);
}
$total_time+= (microtime(true) - $start);
echo round($assign_time, 2).' seconds to set the array values\n';
echo round($query_time, 2).' seconds to execute the query\n';
echo round($fetch_time, 2).' seconds to fetch data\n';
echo round($total_time, 2).' seconds to execute whole script\n';
echo "Peak Memory Usage:".round(memory_get_peak_usage(true)/(1024 * 1024), 2)." MB\n";
PDO Results
Deb 7 PHP 5.4 mysqlnd 5.0.10
1.85 seconds to set the array values
12.51 seconds to execute the query
16.75 seconds to fetch data
31.82 seconds to execute whole script
Peak Memory Usage:11417.5 MB
Deb 8 PHP 5.6 mysqlnd 5.0.11-dev
1.75 seconds to set the array values
12.16 seconds to execute the query
15.72 seconds to fetch data
30.39 seconds to execute whole script
Peak Memory Usage:11417.75 MB
Deb 8 PHP 7.0 mysqlnd 5.0.12-dev
0.71 seconds to set the array values
35.93 seconds to execute the query
114.16 seconds to fetch data
151.19 seconds to execute whole script
Peak Memory Usage:6620.29 MB
Baseline comparison code
$start_query = microtime(true);
exec("mysql --user=foo --host=1.2.3.4 --password=bar -e'SELECT * FROM `profile`.`table`' > /tmp/out.csv");
$query_time = (microtime(true) - $start_query);
echo round($query_time, 2).' seconds to execute the query \n';
Execution time is similar for all systems at 19 seconds +-1 second variation.
Based on above observations I would say that PHP 5.X is reasonable as there is a bit more work executed than just dumping to the file.
all 3 servers are on same host (source and both test servers)
tests are consistent when repeated
there is already similar variable in memory ,I need to do it for comparison removed for testing, is not related to the problem
CPU is at 100% whole time
Both servers have 32G RAM and swappiness set to 1, goal is to perform it as memory operation
test server is dedicated, there is nothing else running
php.ini changed between major versions but all options relating to mysqli/PDO seems to be the same
Deb8 machine was downgraded to PHP5.6 and issue disappeared, after reinstalling PHP7 its back
Reported a bug at php.net - ID 72736 since I belive that it was proven that problem is in PHP and not in the system or any other configuration
Edit 1 : Added PDO Comparison
Edit 2 : Added benchmarking markers, edited PDO results as there was benchmarking error
Edit 3 : Major cleanup in original question, rebuild of code snipets for better indication of the error
Edit 4 : added point about Downgrade and upgrade of PHP
Edit 5 : added extended benchmarking for DEB8 PHP7.0
Edit 6 : included php7 config
Edit 7 : performance measurement for PHP 7.1 dev with both libraries- compiled with configs from bishop, removed my php-config
Edit 8 : added comparison against CLI command, minor clean-ups
For cross-reference: With the release of PHP 7.1 on 1st Dec 2016 this issue should be resolved (in PHP 7.1).
PHP 7.0: Even in the ticket it's written that PHP-7.0 has been patched, I've not yet seen in the recent change-log (7.0.13 on 10 Nov 2016, since patch incorporation date) that this is part of the current PHP 7.0.x release. Perhaps with the next release.
The bug is tracked upstream (thanks to OP's report): Bug #72736 - Slow performance when fetching large dataset with mysqli / PDO (bugs.php.net; Aug 2016).
As the problem appears to be in the fetch (not the array creation), and we know the driver is running mysqlnd (which is a driver library independently written by the PHP team, not provided by MySQL AB aka Oracle), then recompiling PHP using libmysqlclient (which is the MySQL AB aka Oracle provided interface) may improve the situation (or at least narrow the problem space).
First thing I'd suggest is writing a small script that can be run from the CLI that demonstrates the problem. This will help to eliminate any other variables (web server modules, opcache, etc).
Then, I'd suggest rebuilding PHP with libmysqlclient to see if performance improves. Quick guide to rebuilding PHP (for the technically competent):
Download the source for the PHP version you want
Decompress and go into the PHP code directory
Run ./buildconf
Run ./configure --prefix=/usr --with-config-file-path=/etc/php5/apache2 --with-config-file-scan-dir=/etc/php5/apache2/conf.d --build=x86_64-linux-gnu --host=x86_64-linux-gnu --sysconfdir=/etc --localstatedir=/var --mandir=/usr/share/man --enable-debug --disable-static --with-pic --with-layout=GNU --with-pear=/usr/share/php --with-libxml-dir=/usr --with-mysql-sock=/var/run/mysqld/mysqld.sock --enable-dtrace --without-mm --with-mysql=shared,/usr --with-mysqli=shared,/usr/bin/mysql_config --enable-pdo=shared --without-pdo-dblib --with-pdo-mysql=shared,/usr CFLAGS="-g -O2 -fstack-protector-strong -Wformat -Werror=format-security -O2 -Wall -fsigned-char -fno-strict-aliasing -g" LDFLAGS="-Wl,-z,relro" CPPFLAGS="-D_FORTIFY_SOURCE=2" CXXFLAGS="-g -O2 -fstack-protector-strong -Wformat -Werror=format-security"
Run make && make test
Walk away
Run sapi/cli/php -i and confirm the version and presence of libmysqlclient
Run your test again. Any better?
I have a problem in Php file Execution Time, first I tell what I did in PHP file.. I need to Generate CSV file so I wrote Query to fetch data from DB. and My query return 1 million record and I have use PHP fwrite() to write data into CSV file. but my script Taken 76.481406211853 sec to generate one csv file ehich contains 1 million of data. How to reduce this execution time? Sometime I got fatal error:
Fatal error: Allowed memory size of 1048576 bytes exhausted (tried to allocate 793601 bytes)
so, how to manage memory?
PHP code here:
<?php
// start script
$time_start = microtime(true);
echo_memory_usage();
//My logic here
// End of Script
echo 'Total execution time in seconds: ' . (microtime(true) - $time_start);
echo_memory_usage();
function echo_memory_usage() {
$mem_usage = memory_get_usage(true);
if ($mem_usage < 1024)
echo $mem_usage." bytes";
elseif ($mem_usage < 1048576)
echo round($mem_usage/1024,2)." kilobytes";
else
echo round($mem_usage/1048576,2)." megabytes";
echo "<br/>";
}
?>
My result is
512 kilobytes //Script start
1006.25 megabytes // script End
Total execution time in seconds: 76.481406211853
And successfully write CSV file with 1 million record.. but execution time too long and sometime throws Fatal Error. And also how to set ini_set()? Because I have to set ini_set('memory_limit', '1023M');
The reason of I set 1023, after script run memory usage is 1006.25, so I have to set 1023M? Is it correct way?
Execution time depends on the external connections, db connections and loops of same script. Try to do one step per time:
1. let the script just connect to db doing nothing
2. let the script read the data
3. let the script prepare the data for saving
Write down the execution time for every case to check where the fault is.
Option 1:
You can change memory_limit in your php.ini file.
Option 2:
Maybe you are using heavy objects or slow connections.
If you want to improve your code you can test it here:
// Code 1
$start = microtime(true);
/* Here the code 1 */
$timeTotal1 = microtime(true) - $start;
echo 'Code 1: '. $timeTotal1 .'<br>';
// Code 2
$start = microtime(true);
/* Here the code 2 */
$timeTotal2 = microtime(true) - $start;
echo 'Code 2: '. $timeTotal2 .'<br>';
// Winner
echo '<b>Winner:</b> '. ( $timeTotal1 > $timeTotal2 ? 'Code 2' : 'Code 1');
Normally you would do this via the php.ini of your webserver, but you can also do it like this:
ini_set('memory_limit','16M');
Values are specified like 16,32,64 always ending with the "M" for megabytes.
Or just remove the limit:
ini_set("memory_limit",-1);
A few days ago wrote a php script that goes through all my music and reads id3 tags for each song and inserts those in a mysql database. Here's a snippet for context:
exec ( "find /songs -type f -iname '*mp3'", $song_path );
$number_of_songs = count($song_path);
for($i=0; $i<$number_of_songs; $i++){
//read id3 tags
//store id3 tags into database
}
I changed the php directive max_execution_time in apache2/php.ini to gain a better understanding of what this directive does.
When I set max_execution_time = 10, my php script runs for about 45 seconds and successfully reads the id3 tags for about 150 songs (Out of thousands of songs) and inserts those tags into a mysql database before terminating the script and outputting the following to the screen:
Fatal error: Maximum execution time of 10 seconds exceeded in /websites/.../public_html/GetID3()/getid3/module.audio.mp3.php on line 1894
From the documentation, 'The maximum execution time is not affected by system calls, stream operations etc' http://www.php.net/manual/en/info.configuration.php#ini.max-execution-time
What can I infer from the difference between the
maximum_execution_time being set at 10 seconds and the script
running for a total of 45 seconds before terminating? Does this
mean out of the 45 seconds, 35 were spent doing non-php related
activities like reading the id3 tags, inserting data into mysql etc..., while 10 were spent
doing php related activities like iterating the loop?
Is there a way I can calculate the execution time and print it to
the screen?
EDIT
Using the timer Dagon suggested, I called the getTime() function at the end of the loop, there were about 100+ iterations of the loop. Here is the output to my browser:
0.1163 seconds
0.8142 seconds
1.1379 seconds
1.5555 seconds
...
76.7847 seconds
77.2008 seconds
77.6071 seconds
Fatal error: Maximum execution time of 10 seconds exceeded in /websites/.../public_html/GetID3()/getid3/module.audio.mp3.php on line 505
<!-- Paste this at the top of the page -->
<?php
$mic_time = microtime();
$mic_time = explode(" ",$mic_time);
$mic_time = $mic_time[1] + $mic_time[0];
$start_time = $mic_time;
?>
<!-- Write Your script(executable code) here -->
enter code here
<!-- Paste this code at the bottom of the page -->
<?php
$mic_time = microtime();
$mic_time = explode(" ",$mic_time);
$mic_time = $mic_time[1] + $mic_time[0];
$endtime = $mic_time;
$total_execution_time = ($endtime - $start_time);
echo "Total Executaion Time ".$total_execution_time." seconds";
?>
i don't believe the script is actully running for more than 10 seconds, you need to put a proper timer in it
<!-- put this at the top of the page -->
<?php
function getTime() {
$timer = explode( ' ', microtime() );
$timer = $timer[1] + $timer[0];
return $timer;
}
$start = getTime();
?>
<!-- put other code and html in here -->
<!-- put this code at the bottom of the page -->
<?php
$end = getTime();
$time_took= round($end - $start,4).' seconds';
echo $time_took;
?>
This type of script should really be executed in the CLI environment, not in a php process executed by your web server. As per the manual docs on how the PHP command line environment differs from other PHP SAPIs:
PHP in a shell environment tends to be used for a much more diverse
range of purposes than typical Web-based scripts, and as these can be
very long-running, the maximum execution time is set to unlimited.
While it doesn't answer your question, it does solve your problem :)
Seems like you not only try to measure the script duration, but also try to limit it. And in your case max_execution_time is not what you want.
Basically, "The maximum execution time is not affected by system calls, stream operations etc" is correct. If you need to limit real-time script length, you need to implement your own time measurement. People usually write some benchmark class for it, which after all will be helpful in optimizing the script, but simple
$timer['start'] = time();
$timer['max_exec_time'] = 10; // seconds
at start and
if (time() > $timer['start'] + $timer['max_exec_time'])
break; // or exit; etc
at the end of the loop or anywhere else you want should be enough.