Memcache cache optimization tips to make your website faster

With the advent of the big data era, the amount of data and access to Internet applications continues to grow, and the requirements for system performance and scalability are also getting higher and higher. Caching is one of the common means to improve system performance. As a high-performance caching system, Memcache is widely used in Internet applications. This article will introduce some Memcache cache optimization techniques to make your website speed up.

1. Set the cache expiration time reasonably

Memcache improves access speed by exchanging space for time. When the cache is set with an expiration time, the data will expire at that time. It will automatically expire later and needs to be obtained from the database again. Therefore, the expiration time setting must be strictly based on the actual situation. If the expiration time is set too short, frequently reading data from the database will consume a lot of resources and reduce system performance; if the expiration time is too long, the cached data will not be updated in time, leading to data inconsistency.

Usually we can set the cache expiration time according to business needs. For example, some data that does not change frequently can be set with a longer expiration time, and some data that changes frequently can be set with a shorter expiration time. At the same time, you can also use multi-level caching to store data in Memcache and other caches at the same time to cope with different scenarios.

2. Use batch operations to reduce network overhead

When using Memcache to store large amounts of data, using batch operations can effectively reduce network overhead and system load. If a single operation is used to read and write each cache item, each request will need to go through a network transmission, which will greatly reduce the efficiency of the system.

Using batch operations can package multiple requests into one batch request, reducing the number of network I/Os and improving system efficiency. At the same time, Memcache also provides many batch operation methods, such as getMulti and setMulti, etc. Developers can choose the method that suits them to perform batch operations.

3. Use the compression function to save memory space

When storing large amounts of data, memory space is a very important resource. If the amount of data in the cache reaches the upper limit of the memory space allocated by Memcache, it will cause a system crash or exception, so the compression function needs to be used to save memory space.

Memcache provides the function of compressing data, so that the data in the cache can be compressed before being stored, thereby reducing the memory space occupied. When compressing data, you need to pay attention. If there is some already compressed data, you do not need to compress it again. Otherwise, it will increase the burden on the CPU and affect the system efficiency.

4. Use consistent hashing to reduce cache invalidation

In Memcache, whenever a new server is added or removed, all data cached on that node will become invalid. This will cause some user requests to be unable to obtain data from the cache, reducing system performance. Therefore, consistent hashing technology needs to be used to reduce cache invalidations.

Consistent hashing is a hashing algorithm that can map different cache items to different servers. When adding or removing servers, only some cache entries need to be remapped, not all cache entries. This can reduce cache failures and improve system availability and performance.

Summary:

Through the above four optimization techniques, the speed of the website can be increased. Of course, these tips are only part of optimizing the Memcache cache. There are many other optimization solutions, such as using Redis as a cache, optimizing SQL queries, etc. Only through continuous optimization can the performance of the website be continuously improved.

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