How does php handle request timeout?

Question

Rules are for the good of the group, and timeouts are no exception. Timeouts are configured to fit normal program execution.

Table of Contents Show

User-Configurable Timeouts
Timeouts That are not Configurable
Frequently Asked Questions
Why is the timeout still set to 59 seconds, after setting up the time out for 120 seconds?
Can I manually run Drupal cron for longer than the Pantheon executed Drupal cron?
What if I run into a timeout when using the Drupal Migrate UI?
Can Pantheon change the non-configurable timeouts for my site?
How do I change the Solr timeout on Drupal?
How do I install a theme or plugin that keeps timing out?
More Resources
Does PHP have a timeout?
What is PHP time limit?
How do I fix PHP timeout?
What does Set_time_limit 0 mean?

When troubleshooting timeout errors, first verify that the timeout is not caused by idle application containers. Sometimes timeouts can be reached when working with inefficient code or when attempting to execute a long-running job that would be better suited for Terminus.

User-Configurable Timeouts

Name	Timeout	Description
PHP max_execution_time	120 Seconds	Maximum time a script can run before being terminated by the parser. This includes Drush & WP-CLI commands. Helps prevent poorly written scripts from tying up your application container's PHP workers. You can edit this timeout via `settings.php` or `wp-config.php`. Scripts executed through the GlobalCDN will still be restricted by the 59 second connection timeout.
Solr	5 Seconds	Typically reached if you try to index too much at once (use a reasonable batch size and avoid indexing large binary files).

Timeouts That are not Configurable

Name	Timeout	Description
Connection Timeout	59 seconds	Number of seconds to wait for a timeout.
First Byte Timeout	59 seconds	Number of seconds to wait for the first byte.
Between Bytes Timeout	59 seconds	Number of seconds to wait for between bytes.
Pantheon executed Drupal cron	180 seconds	Only applies to Pantheon's automatic hourly execution of Drush cron.
PHP set_time_limit	120 seconds	Number of seconds a script can run. If reached, the script returns a fatal error.
Load Balancer	120 seconds	Applies to HTTPS requests and requests to a DNS A record. Requests using the Pantheon CNAME for HTTP requests are not limited.
SSH	10 minutes idle	Applies to remote Drush and WP-CLI commands, SSH tunneling, SFTP, rsync.
MySQL net_write_timeout	90 seconds	Number of seconds to wait for a block to be written to a connection before aborting the write.
MySQL net_read_timeout	90 seconds	Number of seconds to wait for more data from a connection before aborting the read.
MySQL wait_timeout	420 seconds	Number of seconds the server waits for activity on a non-interactive connection before closing it.
MySQL interactive_timeout	420 seconds	Number of seconds the server waits for activity on an interactive connection before closing it.
Nginx fastcgi_read_timeout	900 seconds	PHP won't run forever.

Frequently Asked Questions

Why is the timeout still set to 59 seconds, after setting up the time out for 120 seconds?

All web requests are set to 59 seconds. Fastly's GCDN terminates the request if the backend does not respond after 59 seconds. PHP will continue to process the request until it hits the PHP max_execution_time, however the results will not be relayed to the user browser, because the connection has already terminated.

All non-web requests, such as those that do not pass Fastly's CDN, have a maximum timeout of 120 seconds. This includes requests from Terminus or PHP scripts via SSH.

Note

If the request passes through port 80 and 443 it will timeout at 59 seconds.

Can I manually run Drupal cron for longer than the Pantheon executed Drupal cron?

Yes, use the command terminus drush <site>.<env> -- cron in Terminus. Most slow cron executions are due to PHP errors or a slow external service. Best practice is to identify and fix the root cause. Check log files and review PHP errors and exceptions for clues.

What if I run into a timeout when using the Drupal Migrate UI?

As recommended in the Migrate module documentation, use Drush, which can be invoked through Terminus.

If you're migrating to a Drupal 7 site, you can also configure Migrate to trigger Drush imports from the UI by configuring the migrate_drush_path variable to:

$conf['migrate_drush_path'] = $_ENV['HOME'] . '/bin/drush';

Can Pantheon change the non-configurable timeouts for my site?

No, these settings apply to every site on Pantheon. One of the ways Pantheon scales so well is by avoiding one-off configurations. We run a highly tuned universal configuration for optimized performance.

How do I change the Solr timeout on Drupal?

Do not edit the pantheon_apachesolr module within your Drupal site installation, it will void your warranty and we can't support user modifications. Instead, reduce the batch size and avoid indexing large binary files.

How do I install a theme or plugin that keeps timing out?

If you receive a The application did not respond in time error when trying to install a theme or plugin, your experience may be affected by a combination of large files and a poor internet connection. Extract the files locally and upload them via SFTP.

Agencies that frequently deploy sites using a common set of themes and plugins should consider creating a custom upstream.

More Resources

Platform Considerations
Errors and Server Responses
Modules and Plugins With Known Issues
Database Connection Errors

Does PHP have a timeout?

The default socket timeout in PHP is 60 seconds. HTTP requests performed with for example file_get_contents , fopen , SOAPClient or DOMDocument::load are using this timeout INI setting to decide how long to wait for a response.

What is PHP time limit?

By default, the maximum execution time for PHP scripts is set to 30 seconds. If a script runs for longer than 30 seconds, PHP stops the script and reports an error. You can control the amount of time PHP allows scripts to run by changing the max_execution_time directive in your php. ini file.

How do I fix PHP timeout?

You can set PHP's time limit by configuring max_execution_time option so that your script won't timeout and exit with an error..

Open php. ini file using your favourite text editor. ... .

Set the value for max_execution_time in seconds. ... .

Restart your web server..

What does Set_time_limit 0 mean?

Syntax: set_time_limit ( int $seconds ) Return Value: Boolean ( True or False ) Default value:30 seconds. For the maximum or you can say for the infinite execution time, we can set the function with the 0 value. If the value is 0 then it will run for an infinite time.

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