Why is Memcache better than direct File cache?

: This article mainly introduces how to use Memcache to cache files rather than directly using File files ?, If you are interested in the PHP Tutorial, refer. Use a local environment to test 0.1 million and 1 million cached reads and writes. the test environment and results are as follows.

Environment

Win7 x64 AMD7750 dual-core memory 8 GApache 2.4.9PHP 5.5.12 ts vc11 memcache 2.2.7

Code

  Connect ('2017. 0.0.1 ', 11211); $ data = $ mem-> get ($ key); if (empty ($ data )) {$ data = date ('Y-m-d H: I: s'); $ mem-> set ($ key, $ data);} return $ data ;} $ t1 = microtime (true); $ I = 0; $ limit = 1000*100; // 0.1 million times $ data = null; while ($ I <$ limit) {// $ data = cacheFile ($ I); $ data = cacheMem ($ I); $ I ++ ;}$ timeUse = microtime (true)-$ t1; $ arr = ['cost' => sprintf ('%. 7fs ', $ timeUse), 'mem' => convert (memory_get_usage ()]; var_dump ($ arr );

Result 10 thousand times

Time-consuming memory: File 1.9sec250kbMemcache 11sec250kb

Result 0.1 million times

Time-consuming memory File94s 251.18 KBMemcache timeout 120 s error

Memcache failed to perform the test for 0.1 million times. The error message is as follows:

Warning: Memcache::connect(): in D:\localhost\speed.php online37Warning: Memcache::get(): No servers added to memcache connection in D:\localhost\speed.phpWarning: Memcache::set(): No servers added to memcache connection in D:\localhost\speed.php online41Fatal error: Maximum execution timeof120seconds exceeded in D:\localhost\speed.php online38

Conclusion

memcacheThe cache is used for caching but File files are not directly cached. the reason for this test is that during the interview, I replied that I did not use this memcache for caching, directly use the File cache (a single server), and the result is directly recognizedCainiao. But I passed this test, although it is under win, why is Memcahe performance inferior to File?
Or is there an error in my testing method? Solving default.fu@foxmail.com

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