我已经用php-fpm设置opcache，但由于某种原因，它不断手动重新启动。 我没有重新启动，我已经设置强制重启超时时间为2700秒（2小时），所以caching不应该被清除。
什么导致手动重启？
Array ( [opcache_enabled] => 1 [cache_full] => [restart_pending] => [restart_in_progress] => [memory_usage] => Array( [used_memory] => 58506120 [free_memory] => 478364792 [wasted_memory] => 0 [current_wasted_percentage] => 0 ) [interned_strings_usage] => Array( [buffer_size] => 16777216 [used_memory] => 5840560 [free_memory] => 10936656 [number_of_strings] => 3946503 ) [opcache_statistics] => Array( [num_cached_scripts] => 1553 [num_cached_keys] => 3015 [max_cached_keys] => 16229 [hits] => 52263 [start_time] => 1475655854 [last_restart_time] => 1475662737 [oom_restarts] => 0 [hash_restarts] => 0 **[manual_restarts] => 97** [misses] => 1553 [blacklist_misses] => 0 [blacklist_miss_ratio] => 0 [opcache_hit_rate] => 97.114241117883 ) )