Memory consumption of submissions list view

[jojoob]

We have a VPL activity with 57 submissions for which 128M memory limit isn't enough to view the submissions list. The list is shown empty and the apache/PHP error.log on the server reports memory exhausted.

PHP Fatal error:  Allowed memory size of 134217728 bytes exhausted (tried to allocate 33554440 bytes) in /var/www/moodle/mod/vpl/vpl_submission.class.php on line 880

This is the place where the over allocation happens: vpl_submission.class.php line 880. The compilation.txt and execution.txt files seem to be quite large.

As a workaround we set memory_limit to 512M via ini_set('memory_limit', '512M'); for this file. But I hope for a fix that lowers the memory usage for this page.

Btw. I can't find the download submission action described here. I only found the download link on submission view page. But the downloaded zip only includes the submitted files and none of the other directories mentioned in the documentation. I wanted to check the compilation.txt and execution.txt files.

We are running 3.5.0+ (2022052312) (commit 43e59a6899e4c7adedc35d3fe9a761ecbe32673f) on Moodle 3.9. This is a bit old but vpl_submission.class.php was not changed significantly since then.

[jcrodriguez-dis]

The commit 37b0d56d4c0ba79b5fbd68d28e6541607c267098, included in VPL 4.2.0, addresses this issue reduding the memory required in the view of the submissions list. For 100 students the memory peek is 12MB + the size of the largest user submision information.