Apc optimization
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The document discusses techniques for optimizing opcode caching in APC (Alternative PHP Cache) by tuning various APC configuration settings. These settings control aspects like the maximum file size to cache, number of files to cache, file update checking frequency, and enabling/disabling various caching defenses. It also recommends using more efficient locking mechanisms like futex locks over file locks for concurrency, using a more efficient serialization format like igbinary, and priming the cache before the site goes live.
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Apc optimization
- 2. 2 caching mechanism Memory cache for long operations and calculations Opcode cache for skipping code interpretation
- 3. Opcode The Vulcan Logic Disassembler
- 4. Tuning opcode cache apc.max_file_size (1M) Files bigger then that wouldn't be cached. apc.num_files_hint (1000) Number of files that will be cached. Increase it. apc.file_md5 (0) Keep it 0, it's a lie apc.ttl (0) How long the file will stay cached
- 5. Tuning opcode cache apc.stat (1) Rechecking if file was updated. Set it to 0.
- 6. Tuning opcode cache strace -e trace=file httpd -X
- 7. Tuning opcode cache apc.stat (1) Rechecking if file was updated. Set it to 0. apc.slam_defense (1) Prevents mass caching on startup. Set to 0 apc.write_lock (1) Prevents locking of parallel requests apc.file_update_protection (2) Seconds to wait before new file gets cached
- 8. Extra control on opcode caching apc.filter (null) Regexp: cache only matching it files. apc.cache_by_default (1) Caches all php files. If set to 0 - it would use the filter apc.canonicalize (1) Convert relative path's into canonical. Set to 0 and always use absolute path's.
- 10. Concurrent locking File locks Basic locking mechanism. Very slow. IPC Semaphore locks Semaphores (provided by the OS). Better then file locks Linux Futex locks Linux specific mechanism. Significant gain. ( user space ) Pthread mutexes Almost same as futex ( kernel space) Spin locks Extremely fast. Ported from Postgres. Eats your cpu
- 12. Use igbinary Serialization sucks Example array: [1,2,'hi']
- 13. Use igbinary
- 14. Apc constants Regular defines are uber slow
- 15. Prime cache before start Preload cache with data before going public apc_store() apc_compile_file()