{"id":73426,"date":"2020-03-09T14:42:13","date_gmt":"2020-03-09T11:42:13","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/reliz-memcached-1-6-0-s-vklyucheniem-podderzhki-vneshnego-hranilishha"},"modified":"2020-03-09T14:42:13","modified_gmt":"2020-03-09T11:42:13","slug":"reliz-memcached-1-6-0-s-vklyucheniem-podderzhki-vneshnego-hranilishha","status":"publish","type":"post","link":"https:\/\/prohoster.info\/en\/blog\/news\/reliz-memcached-1-6-0-s-vklyucheniem-podderzhki-vneshnego-hranilishha","title":{"rendered":"Release of Memcached 1.6.0 with support for external storage","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

Took place<\/a><\/noindex> significant release of the in-memory data caching system Memcached 1.6.0<\/a><\/noindex>, operating on data in key\/value format and distinguished by its ease of use. Memcached is commonly used as a lightweight solution to accelerate high-load websites by caching access to databases and intermediate data. Code is provided<\/a><\/noindex> under the BSD license.<\/p>\n

The new version stabilizes the implementation of the store 'extstore',extstore<\/a><\/noindex>which is now built by default (to disable it, the option '--disable-extstore' is available in the configure script), but requires explicit activation during startup (old installations will continue to function unchanged after the update). Although the 'extstore' is generally considered stable, caution is advised when implementing it in very large systems.<\/p>\n

Extstore allows the use of SSD\/Flash drives to extend cache size. As with RAM, the Flash storage is not persistent and is reset on restart. The new mode is intended for effective caching of large data sets. When using 'extstore', keys and metadata are still stored only in RAM, but the large data associated with these keys, exceeding a defined threshold, is saved in external storage, while only a pointer remains in RAM. <\/p>\n

If the key is associated with small data, Memcached operates normally, keeping data in memory and not accessing external storage. If there is ample free memory, the most requested data can additionally reside entirely in memory cache (for example, one can specify that only objects larger than 1024 bytes, which have not been accessed for 3600 seconds, should be flushed to Flash).<\/p>\n

The implementation is optimized for maximum performance and minimal CPU load, at the expense of storage efficiency (high fragmentation). To extend the life of Flash drives, data is buffered and flushed to storage sequentially. To preserve cache state between restarts, the option to flush a cache dump to a file, introduced in version 1.5.18, can be used. On the next startup, the cache can be restored from this file to avoid load spikes on content handlers due to a cold cache (the cache immediately becomes 'warm').<\/p>\n

The second significant change in Memcached 1.6 is a reworked networking code that is adapted for automatic batch processing within a single system call. Previously, when multiple 'GET' commands were sent in a single TCP packet, memcached would return results by making separate system calls. In Memcached 1.6, responses are aggregated and returned via a single system call. As a result, there is now an average of 1.5 keys per system call, demonstrating up to a 25% reduction in CPU load and a slight decrease in latency in tests.<\/p>\n

The revision of the networking subsystem also allowed for dynamic buffer allocation as needed, rather than static buffer assignment. This optimization reduced memory consumption while waiting for new commands over a client-established connection from 4.5 KB to 400-500 bytes, and eliminated many calls to malloc, realloc, and free, which led to unnecessary memory fragmentation on systems with a large number of connections. Each worker thread now handles its own pool of buffers for reading and writing for active client connections. To configure the size of these buffers,
\nThe options '-o resp_obj_mem_limit=N' and '-o read_buf_mem_limit=N' are provided.<\/p>\n

In branch 1.6, it was also announced that the binary protocol<\/a><\/noindex> for server interaction will be deprecated. Maintenance of the binary protocol and bug fixes will continue, but new features and updates to existing functions will not be carried over. The text protocol<\/a><\/noindex> will continue to evolve unchanged. The binary protocol has been replaced by a new protocol, meta<\/a><\/noindex> (a text version of the protocol with compact meta commands), which demonstrates an optimal combination of performance and reliability. The new protocol covers all operations previously available through the text and binary protocols.<\/p>\n

<\/a><\/noindex><\/p>\n

Source: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

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