How Fast Is the Stored Program Language?
It would be terribly unfair of us to expect the first release of the MySQL stored program language to be blisteringly fast. After all, languages such as Perl and PHP have been the subject of tweaking and optimization for about a decade, while the latest generation of programming languages.NET and Javahave been the subject of a shorter but more intensive optimization process by some of the biggest software companies in the world. So right from the start, we expected that the MySQL stored program language would lag in comparison with the other languages commonly used in the MySQL world.
Still, we felt it was important to get a sense of the raw performance of the language. So we put together a number of test scripts. First off, we wanted to see how quickly the stored program language could crunch numbers. Stored programs generally do not perform computationally expensive operations, butgiven that you sometimes have a choice between various application tiers when performing some computationally intensive taskit's worth knowing if the stored program language is up to the job.
To test basic compute performance, we wrote a stored program that determines the number of prime numbers less than a given input number. (We're sure that some of you will know better algorithms, but remember that the point is to compare languages, not to calculate prime numbers in the most efficient manner possible.) The stored program is shown in Example 22-1.
Example 22-1. Stored program to find prime numbers
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CREATE PROCEDURE sp_nprimes(p_num int) BEGIN DECLARE i INT; DECLARE j INT; DECLARE nprimes INT; DECLARE isprime INT; SET i=2; SET nprimes=0; main_loop: WHILE (i |
We implemented this algorithm in a variety of languagesC, Java, VB.NET, Perl, PHP, and PL/SQL (the Oracle stored program language). For instance, the Oracle implementation of the procedure is shown in Example 22-2; as you can see, while some of the language constructs differ, the algorithms are identical.
Example 22-2. Oracle implementation of the prime number procedure
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PROCEDURE N_PRIMES ( p_num NUMBER) IS i INT; j INT; nprimes INT; isprime INT; BEGIN i:=2; nprimes:=0; <> WHILE (i> WHILE (j |
We executed each program multiple times to seek the number of prime numbers less than 8000. The results are shown in Figure 22-1. We ran these tests on the same machine and did our best to minimize any interference from other running programs and, in every other way, to keep the playing field level. Nevertheless, for this computationally intensive trial, MySQL performed poorly compared with other languagestwice as slow as an Oracle stored procedure, five times slower than PHP or Perl, and dozens of times slower than Java, .NET, or C. Remember that Oracle in particular has been optimizing its stored procedure language for over a decade now; in comparison with the initial releases of PL/SQL, the MySQL stored program language is a speed demon!
Figure 22-1. Finding prime numbers in various languages
We are confident that the MySQL stored program language will become more efficient in future releases, but for now we recommend that you avoid using this language for mathematically intensive operations.
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