Attempt to reduce max memory usage during actualize (#2955)

* Attempt to reduce max memory usage during actualize

#Fix https://github.com/FreshRSS/FreshRSS/issues/2952

* Use memory_get_peak_usage

app/Controllers/feedController.php

@@ -333,9 +333,9 @@ class FreshRSS_feed_Controller extends Minz_ActionController {
 
 			$needFeedCacheRefresh = false;
 
-			// We want chronological order and SimplePie uses reverse order.
-			$entries = array_reverse($feed->entries());
-			if (count($entries) > 0) {
+			$entries = $feed->entries();
+			$nbEntries = count($entries);
+			if ($nbEntries > 0) {
 				$newGuids = array();
 				foreach ($entries as $entry) {
 					$newGuids[] = safe_ascii($entry->guid());
@@ -346,7 +346,8 @@ class FreshRSS_feed_Controller extends Minz_ActionController {
 
 				$oldGuids = array();
 				// Add entries in database if possible.
-				foreach ($entries as $entry) {
+				for ($i = 0; $i < $nbEntries; $i++) {
+					$entry = $entries[$i];
 					if (isset($newGuids[$entry->guid()])) {
 						continue;	//Skip subsequent articles with same GUID
 					}
@@ -405,9 +406,12 @@ class FreshRSS_feed_Controller extends Minz_ActionController {
 						$entryDAO->addEntry($entry->toArray());
 						$nb_new_articles++;
 					}
+					unset($entry);
+					unset($entries[$i]);
 				}
 				$entryDAO->updateLastSeen($feed->id(), $oldGuids, $mtime);
 			}
+			unset($entries);
 
 			if (mt_rand(0, 30) === 1) {	// Remove old entries once in 30.
 				if (!$entryDAO->inTransaction()) {
@@ -455,6 +459,7 @@ class FreshRSS_feed_Controller extends Minz_ActionController {
 			$feed->unlock();
 			$updated_feeds++;
 			unset($feed);
+			gc_collect_cycles();
 
 			// No more than $maxFeeds feeds unless $force is true to avoid overloading
 			// the server.

app/Models/Feed.php

@@ -333,7 +333,12 @@ class FreshRSS_Feed extends Minz_Model {
 		$guids = array();
 		$hasUniqueGuids = true;
 
-		foreach ($feed->get_items() as $item) {
+		// We want chronological order and SimplePie uses reverse order.
+		for ($i = $feed->get_item_quantity() - 1; $i >= 0; $i--) {
+			$item = $feed->get_item($i);
+			if ($item == null) {
+				continue;
+			}
 			$title = html_only_entity_decode(strip_tags($item->get_title()));
 			$authors = $item->get_authors();
 			$link = $item->get_permalink();
@@ -414,6 +419,7 @@ class FreshRSS_Feed extends Minz_Model {
 			}
 
 			$guid = $item->get_id(false, false);
+			unset($item);
 			$hasUniqueGuids &= empty($guids['_' . $guid]);
 			$guids['_' . $guid] = true;
 			$author_names = '';
@@ -441,7 +447,6 @@ class FreshRSS_Feed extends Minz_Model {
 			}
 
 			$entries[] = $entry;
-			unset($item);
 		}
 
 		$hasBadGuids = $this->attributes('hasBadGuids');

app/actualize_script.php

@@ -69,6 +69,7 @@ foreach ($users as $user) {
 			fwrite(STDERR, 'FreshRSS write access problem in ' . join_path(USERS_PATH, $user, 'log.txt') . "\n");
 		}
 	}
+	gc_collect_cycles();
 }
 
 Minz_Log::notice('FreshRSS actualize done.', ADMIN_LOG);
@@ -78,6 +79,7 @@ if (defined('STDOUT')) {
 	$duration = date_diff($end_date, $begin_date);
 	fwrite(STDOUT, 'Ending feed actualization at ' . $end_date->format('c') . "\n");	//Unbuffered
 	fwrite(STDOUT, 'Feed actualizations took ' . $duration->format('%a day(s), %h hour(s), %i minute(s) and %s seconds') . ' for ' . count($users) . " users\n");	//Unbuffered
+	fwrite(STDOUT, 'Memory usage: ' . format_bytes(memory_get_peak_usage(true)) . "\n");	//Unbuffered
 }
 echo 'End.', "\n";
 ob_end_flush();