I´m making my first steps with Redis on Laravel and there is something odd I figured out.
When using Redis as a cache driver in my setup it is taking far way to much time to load a page.
How do I know? When not using the Cache facade but the Redis facade directly response times are just a fraction. I set up a laravel installation on scratch and build a migration and seeder for a simple Article model.
First I thought the items were not stored in redis as redis-cli didn´t show them when searching with KEYS *. I figured out the cache is stored in another DB with REDIS_CACHE_DB as found in config/database.php
`INFO keyspace in redis-cli lists those two DB´s named 0 and 1.
I thought the problem could be caused by my localhost setup with Mamp Pro. So I switched over to the Laravel Homestead box and uploaded my project there. Same here.
Here´s the code I´m using: routes/web.php
use Illuminate\Support\Facades\Redis;
use Illuminate\Support\Facades\Cache;
use Illuminate\Http\Request;
use App\Article;
Route::get('/get-articles-mysql', function (Request $request) {
return response()->json(Article::take(20000)->get());
});
Route::get('/get-articles-cache', function (Request $request) {
return Cache::remember('posts', 60, function () {
return Article::take(20000)->get();
});
});
Route::get('/get-articles-redis', function (Request $request) {
if($posts = Redis::get('posts.all')) {
return response()->json(json_decode($posts));
}
$posts = Article::take(20000)->get();
Redis::set('posts.all', Article::take(20000)->get());
return response()->json($posts);
});
I´m using postman to get the response times. I made several runs as the caching routes should be slow on the first request when caching is empty. But what I get on the average is this:
http://laravel-echo.local/get-articles-mysql 583ms
http://laravel-echo.local/get-articles-redis 62ms
http://laravel-echo.local/get-articles-cache 730ms
I´m not getting this. Using the Redis facade directly is super-fast. But why is caching so slow? Yes, I double checked my .env files. There is CACHE_DRIVER=redis so I´m not using file system by accident. And I used both php artisan config:clear and php artisan cache:clear to avoid mistakes when debugging.
I see a key called "laravel_cache:posts" in redis-cli. The cached posts are there. It only takes ages to load them. I also tested the requests in Chrome. The response times are much longer but still caching takes more than mere mysql querying.
So any suggestions what could be going on here?
