![]() Efficient way to continually read in data from a text file.Bash config file throwing errors when sourced from Perl script.Why does my Perl sysread block when reading from a socket?.Different behaviour when using constant string versus reading data from a file.What is the best way to share a config file between Perl scripts and bash scripts?.Reading data from file into an array to manipulate within Perl script.Perl - the fastest way to read a range of lines from a file into a variable.reading and printing a text file in Perl.Best way to run a Perl script from weblogic Java EE application.Problems reading header line from my Excel 2007 files created with Perl.Perl from command line: When replace a string in a file it removes also the new lines.How can I prevent perl from reading past the end of a tied array that shrinks when accessed?.Trouble reading text from a pdf in Perl. ![]() `last` while reading file from external command crashes perl.Reading a line from a file without advancing the line counter with Perl.In perl how can i subtract 10 days from a date which is passed through a text file and output in dd-Month-YYYY(0).Extraction and printing of key-value pair from a text file using Perl.Practicable way of reading xml with huge text nodes in Perl.Extracting and storing the the values in key value pair from a text in file in perl.What is the best perl module to extract text from a pdf?.What is the best way to receive data from a socket in Perl, when the data length is unknown?.Perl WWW::Mechanize doesn't print results when reading input data from a data file.Parse large text file with Perl crashes when run from PHP.Reading from a file descriptor in a non-blocking way with Perl.Best way to read a file into a multi-dimensional array, and skip lines that contain certain information in Perl.What would the best way be to take a string from a text file and search and replace another string with the one from the text file?.Is there an automatic way to build the 'Changes' file from `git log` when publishing a perl module?.Using SSH, what is the best way to remotely execute a perl file from another perl file and pass arguments that contain spaces?.How to display image when reading from a text file using Perl CGI?.Best way to skip a header when reading in from a text file in Perl?.Probably not enough to worry about if you're using the next two fastest. Perhaps that's the cost of accessing a magic global, or perhaps its doing a numeric comparison.Īnd, as predicted by algorithmic analysis, putting the header check code outside the loop is the fastest. However, it's the only one which allocates memory to hold all the lines and that probably accounts for the performance lag. I would have thought it would be the fastest given all the work is happening inside the perl interpreter. I'm shocked to find that my = is slowest by a huge margin. Here's how many times each routine read the file per second. Technique is even more important on a machine with fast I/O. As I/O speed increases, CPU time becomes more significant. ![]() I did this on a laptop with an SSD, but its still a laptop. I wanted to do some work so as to produce a realistic upper limit on how much performance you're going to gain or lose by changing how you read files. I only did a tiny amount of work in each routine to emphasize the difference between the techniques. Since we're not processing the lines, line length shouldn't matter. usr/share/dict/words is a 2.4 meg file with about 240k very short lines. Since this is I/O which can be affected by forces beyond the ability of Benchmark.pm to adjust for, I ran them several times and checked I got the same results. ![]() Shift $Test_File = "/usr/share/dict/words" įlag_in_loop => sub ,
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