If for some reason you still have a problem, see this comment and the rest of that issue. If you have one of those versions of the Zend optimizer and enable the Devel module it will possibly break your site and may end in a blank screen. The Devel module will not work with the old and buggy Zend optimizer 3.2.8 and below (and possibly 3.2.x in general). This is the only mode recommended for live sites.Ī settings option is available when using summary mode with APC, to exclude pages with less than a certain number of accesses. Summary is logged to APC, if installed, so as to not cause extra load on the database. Summary logging logs the average and maximum page generation time, average and maximum memory usage, last access time, and number of accesses for each path. The data includes page generation time in milliseconds, and the number of bytes allocated to PHP, time stamp. The module defaults to no logging at all.ĭetailed logging causes one database row to be written for each page load of the site. Settings to enable detailed logging or summary logging. This is useful for developers and site administrators alike to identify pages that are slow to generate or use excessive memory. Find out how that problematic variable is being passed in. Trace back to where the function was being called up. Add drupal's ddebugbacktrace () to the conditional. Setup a conditional to detect this variable when it happens. View and log performance statistics for a site, such as page generation times, and memory usage, for each page load. Isolate the variable that was causing the issue. Essential for developers of node access modules and useful for site admins in debugging problems with those modules. View the node access entries for the node(s) that are shown on a page. Similarly, a ddebug_backtrace() is offerred.Īccelerate development of your site or module by quickly generating nodes, comments, terms, users, and more. The summary includes how many times each query was executed on a page (shouldn't run same query multiple times), and how long each query took (short is good - use cache for complex queries).Īlso a dprint_r($array) function is provided, which pretty prints arrays. This module can print a summary of all database queries for each page request at the bottom of each page. Helper functions for Drupal developers and inquisitive admins. After all, as Dijkstra said, "If debugging is the process of removing bugs, then programming must be the process of putting them in.#D7CX: I pledge that Devel will have a full Drupal 7 release on the day that Drupal 7 is released.Ī suite of modules containing fun for module developers and themers. To be sure you can print the output of file_directory_temp() You should see a result like: Debugging is a part of our job and any programmer would do well to invest in understanding their debugging tools. On windows it should write to c:\windows\temp. The command ~ $ tail -f /tmp/drupal_debug.txt will show the last few lines of that file and any new lines that are written to the file. uid) // print objects and arrays dd($user) dd(unserialize($user)) ?> On most mac or linux systems this will be written to /tmp/drupal_debug.txt. You use dd() just like var_dump() or dpm(). It’s also means your webpage's load time and html are intact. That means you don’t have to wait for the batch process to finish to see what is happening. dd() writes strings, arrays and objects to a temporary file instead of to the drupal webpage. And the indispensable devel module provides. It's unreliable enough for me to seek a better solution. You might arrive at the next page load with all your objects and debug messages printed to the screen, but you might not. So how do we debug this kind of work? Using dprint_r() or dpm() might help here. However, when we use an abstraction layer, we lose knowledge of what is happening below. Instead of an endlessly loading white page we can see a themed page that includes a progress bar. We do this to avoid PHP timeouts and provide a better user experience. Instead of loading a drupal page that runs a function to migrate all users, it loads a page that makes AJAX calls to run that function. What is going on and how do you find out? Batch API is an abstraction layer for performing tasks, in this case migrating a block of users. Except that for every migration, there are seven (seemingly random) users that aren’t migrated. The right answer is to the use the surprisingly simple Batch API. You’re a developer who has to write a user migration tool for a client.
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