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Variables and Data It s very easy to let Perl use a lot of memory without considering the consequences The following tips should help you to reduce the memory footprint of your variables:
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I Use the vec function to store very small numbers in a single variable, rather than individual variables for each I Use pack and unpack to store information efficiently in external files I Use substr to store small fixed-length strings in one larger string You can also follow this through to arrays and hashes, which can be stored in a file if memory space is really tight If necessary, use temporary files to store very large arrays In addition, consider using a DBM file to store hash and list information out of memory If you want to store small pairs of information in hashes, consider using the Tie::SubstrHash module, which will compact hash data much more tightly than the normal 1K (or larger) key/value pair size
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Iteration and Program Control Certain Perl statements automatically imply large memory overheads The more significant ones are listed here:
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I Use each in place of keys for iterating through hashes when order is not important It reduces the size of the temporary list passed to the loop-control statement I Try to avoid creating large temporary lists; for example:
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foreach (0$#array) { #Do something with $array[$_]; }
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Although this has been optimized in recent versions of Perl, it s still best avoided if possible Use a while or for loop with a simple variable and test I In general, try to avoid any list operations that can be avoided; creating an array and then using it frequently uses a lot of temporary storage space, even on relatively small arrays I Use undef and delete to remove variables or hash elements that you no longer need I Pass around references to variables, especially lists and hashes, rather than supplying lists to the function each time
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I Avoid creating temporary lists that are used solely to support a sequence for a hash; for example:
@sort = keys %hash; foreach (sort @sorted)
Sort the list inline:
foreach (sort keys %hash)
If the list is complex, and you need to process each element in order to sort, remember that you can supply your own sorting function to sort This process can even be used on complex data for example, to sort dates, you could use:
foreach (sort sortdate keys %errors) { print "$_\n"; }
sub sortdate { my ($c,$d) = ($a,$b); $c =~ s{(\d+)/(\d+)/(\d+)}{sprintf("%04d%02d%02d",$3,$1,$2)}e; $d =~ s{(\d+)/(\d+)/(\d+)}{sprintf("%04d%02d%02d",$3,$1,$2)}e; $c <=> $d; }
Here we ve copied the values of $a and $b supplied to the function and then compared the modified values doing this prevents us from modifying the originals, since $a and $b are really references to the list contents In this instance the space optimization means a decrease in speed!
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Perl: The Complete Reference
erl is, in the strict sense at least, an interpreted rather than a compiled language Unlike languages such as C/C++ and Java, you don t have to compile Perl code into a separate binary format before you can actually execute the program you have written Instead, the Perl interpreter takes the raw textual script code and then executes each statement In fact, Perl does work in a similar fashion to C/C++ and other compiled languages there is, in fact, a compilation stage in the execution process What actually happens is that Perl takes the raw script, parses and then compiles it into a special binary code called bytecode, and then uses the Perl engine to execute the binary code The bytecode is in many ways similar to the machine code used by the CPU in your computer, but it s highly optimized for executing Perl statements In effect, Perl works just like C/C++, except that instead of compiling the source file into a machine-dependent form, the Perl interpreter does the compilation and execution on the fly each time you run the script Because Perl, its parser and compiler, and the virtual machine that executes the final code are all very heavily optimized, the entire process, from starting the interpreter to actually running the compiled code, takes milliseconds on most modern machines Even on a 20-year-old machine, Perl takes only a second to compile an average-length script into a form ready to be executed There are advantages to this approach Perl can execute raw source code at a speed not vastly different to executing a compiled program But because it s executing the source code, that code can be edited and reexecuted in seconds You don t have to recompile and then reexecute the code first Comparing even a fairly simple program shows just how optimized Perl is Taking the simple Hello World example, it takes 0158 milliseconds on my Linux machine to compile and execute the C version, but just 0013 milliseconds to execute the Perl alternative The more astute of you will have recognized a potential bottleneck in the whole process, however For scripts that don t actually change very regularly, such as those on a website, there is a massive overhead of reading, parsing, and compiling the source code each time Perl is asked to execute the script There s also the issue of the libraries and modules used by Perl these change even less frequently, and yet they are imported, parsed, and compiled in exactly the same way as the original script Other languages, including C/C++, Java, and Python, get around the library problem by always making use of a precompiled library if I change the main script, only the script source needs to be recompiled With Perl, it recompiles everything Currently, there are no solutions to the library problem, but there are ways of improving the execution speed of a script by taking the script in its compiled form and using that as the basis of the new script during execution This is the approach used by extensions such as mod_perl and the PerlEx extension for ActivePerl they both store the bytecode and execute that using a built-in interpreter This avoids both the compilation stage and the requirement to fork() a new process and load the Perl interpreter each time the script is called These are web solutions, however, and not all problems are web based They also don t resolve the need by some people to supply a static binary file that cannot be modified, mangled, or hacked by a third party
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