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4.3.1.6. libmemcached Command-line Utilities

In addition to the main C library interface, libmemcached also includes a number of command line utilities that can be useful when working with and debugging memcached applications.

All of the command line tools accept a number of arguments, the most critical of which is servers, which specifies the list of servers to connect to when returning information.

The main tools are:

  • memcat — display the value for each ID given on the command line: 

    shell> memcat --servers=localhost hwkey
Hello world

  • memcp — copy the contents of a file into the cache, using the file names as the key: 

    shell> echo "Hello World" > hwkey
shell> memcp --servers=localhost hwkey
shell> memcat --servers=localhost hwkey
Hello world

  • memrm — remove an item from the cache: 

    shell> memcat --servers=localhost hwkey
Hello world
shell> memrm --servers=localhost hwkey
shell> memcat --servers=localhost hwkey

  • memslap — test the load on one or more memcached servers, simulating get/set and multiple client operations. For example, you can simulate the load of 100 clients performing get operations: 

    shell> memslap --servers=localhost --concurrency=100 --flush --test=get
memslap --servers=localhost --concurrency=100 --flush --test=get	Threads connecting to servers 100
	Took 13.571 seconds to read data

  • memflush — flush (empty) the contents of the memcached cache. 

    shell> memflush --servers=localhost