Timing Queries in Redis-Cli?

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温柔的废话
温柔的废话 2021-02-20 09:04

This seems like it ought to be trivial, but I want to run a query through redis-cli, and then just get back how long it took on the server, along with the results. This is just

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  • 2021-02-20 09:28

    You can do this by wrapping the redis command you're investigating in a MULTI/EXEC block, where the TIME command is used right before and right after your command. For example:

    Using the node library:

    var multi = redis.multi();
    multi.time(); // start time
    multi.sunionstore(['fast_food_joints', 'pizza_hut', 'taco_bell']); // this is the command I'm investigating
    multi.time(); // end time
    multi.exec(function(err, responses){
        var response = responses[1]; // the response i care about
        var start = (parseInt(responses[0][0]) * 1000) + (parseInt(responses[0][1]) / 1000);
        var end   = (parseInt(responses[2][0]) * 1000) + (parseInt(responses[2][1]) / 1000);            
        var execution_time = end - start; // in milliseconds
    });
    

    Or... using the command line (which is what you asked for in your question):

    192.168.1.1:6379> MULTI
    OK
    192.168.1.1:6379> TIME
    QUEUED
    192.168.1.1:6379> SUNIONSTORE fast_food_joints pizza_hut taco_bell
    QUEUED
    192.168.1.1:6379> TIME
    QUEUED
    192.168.1.1:6379> EXEC
    1) 1) "1450818240"
       2) "666636"
    2) (integer) 48886
    3) 1) "1450818240"
       2) "666639"
    

    And then do the math yourself. The above example took 3 microseconds.

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  • 2021-02-20 09:29

    You can set the Slow Log to 0 (zero). Doing so will log every command.

    The time you will see is in microseconds, and from the documentation this time means:

    The execution time does not include the I/O operations like talking with the client, sending the reply and so forth, but just the time needed to actually execute the command (this is the only stage of command execution where the thread is blocked and can not serve other requests in the meantime)

    To factor in the network performance you might have to hack your client library, logging just before and after the communication with redis, leaving out any tranformation your library may do.

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