什么可能导致本地 APC 比远程 Memcached 慢？
我正在努力调整我的缓存，在进行基准测试时，我发现了一些让我感到困惑的东西。
从远程 Memcached 盒（本地网络）中提取密钥需要 0.0008 秒，而从本地 APC 缓存中提取密钥需要 0.0114 秒。是的，速度快了整整 14 倍。
对于本地缓存来说，这似乎非常慢......我应该考虑调整哪些设置以使其更有效？
编辑：根据要求，这是来自 php.ini 的我的 APC 配置
[APC]
;specifies the size for each shared memory segment will need adjustment for your environment.
apc.shm_size=8
;max amount of memory a script can occupy
apc.max_file_size=1M
apc.ttl=0
apc.gc_ttl=3600
; means we are always atomically editing the files
apc.file_update_protection=0
apc.enabled=1
apc.enable_cli=0
apc.cache_by_default=1
apc.include_once_override=0
apc.localcache=0
apc.localcache.size=512
apc.num_files_hint=1000
apc.report_autofilter=0
apc.rfc1867=0
apc.slam_defense=0
apc.stat=1
apc.stat_ctime=0
apc.ttl=7200
apc.user_entries_hint=4096
apc.user_ttl=7200
apc.write_lock=1
提取是通过简单的 apc_fetch('my_key'); 完成的
I am working on trying to tune my caches and in doing benchmarking I found something that is confusing the hell out of me.
Pulling a key from my remote Memcached box (local network) is taking 0.0008 seconds whereas pulling a key from my local APC cache is taking 0.0114 seconds. Yes, it is a full 14x faster.
That seems awfully slow for a local cache... what settings should I be looking at tuning to make it more effective?
Edit: As requested, here is my APC config from php.ini
[APC]
;specifies the size for each shared memory segment will need adjustment for your environment.
apc.shm_size=8
;max amount of memory a script can occupy
apc.max_file_size=1M
apc.ttl=0
apc.gc_ttl=3600
; means we are always atomically editing the files
apc.file_update_protection=0
apc.enabled=1
apc.enable_cli=0
apc.cache_by_default=1
apc.include_once_override=0
apc.localcache=0
apc.localcache.size=512
apc.num_files_hint=1000
apc.report_autofilter=0
apc.rfc1867=0
apc.slam_defense=0
apc.stat=1
apc.stat_ctime=0
apc.ttl=7200
apc.user_entries_hint=4096
apc.user_ttl=7200
apc.write_lock=1
The fetch is being done by a simple apc_fetch('my_key');
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充分利用你的记忆力！尝试将
apc.shm_size提高到 128mb - 这是一个简单的调整，可以显着提高性能。另外，请考虑更改apc.user_entries_hint以满足您应用的要求 - 请参阅 apc 与自定义 mmap 扩展。相关链接：
APC 与自定义 Mmap 扩展
http://2bits.com/articles/ important-tuning-apc-sites-high-number-drupal-modules.html
Take advantage of your memory! Try raising the
apc.shm_sizeto 128mb - its an easy tweak that can improve performance substantially. Also, consider changingapc.user_entries_hintto fit your app's requirements - see apc vs custom mmap extension.Revelant links:
APC vs Custom Mmap extension
http://2bits.com/articles/importance-tuning-apc-sites-high-number-drupal-modules.html