Beefy Boxes and Bandwidth Generously Provided by pair Networks
The stupid question is the question not asked
 
PerlMonks  

comment on

( [id://3333]=superdoc: print w/replies, xml ) Need Help??

Hello, I'm trying to write a script to go through hundreds of "log.gz" files, roughly 500,000 lines per file. Is there something limiting me? How can perl do a single file 3 times faster, but when I start forking perl's performance tanks? Below are the results of timing the parsing of a single file. When timing 70 files, nodejs takes 20 seconds and perl is at 60 seconds.

zcat &> /dev/null 0.54s user 0.01s system 99% cpu 0.549 total node test.js 0.79s user 0.05s system 130% cpu 0.646 total perl test.pl 0.23s user 0.03s system 38% cpu 0.686 total

I've tried forking for each file (limited to the number of cpus(24)). I've also tried dividing the logs by number of forks evenly, IE fork 24 times and each fork works n number of files, some how this was slightly slower. Both node and perl are spawning zcats and parsing line-by-line. I'm unable to use zlib, due to the files being zipped in-correctly by the device generating the logs.

*Edit: the directory is an nfsv3 mounted SAN. For tests, I'm only reading, no printing so IO on the test server should not be an issue. Also both node and perl tests are being run in the same environment.

#!/usr/local/bin/perl use strict; use warnings; use Parallel::ForkManager; my $pm = new Parallel::ForkManager(24); my $dir = '/data/logs/*.log.gz'; my @files = sort(glob "$dir"); for my $file(@files) { $pm->start and next; open(FH,"-|") || exec "/bin/zcat", $file; while(my $line = <FH>){ my @matches = $line =~ /".*?"|\S+/g; # print "$matches[0],$matches[1],$matches[3],$matche +s[4]; #matches[0] = date, matches[1] = time, matches[3] = source IP #matches[4] = dest IP, some other matches are used or may be used. #line is space seperated, but any field with a space is inside "", hen +ce regex instead of split. } $pm->finish; } $pm->wait_all_children;

In reply to Help me beat NodeJS by rickyw59

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":



  • Are you posting in the right place? Check out Where do I post X? to know for sure.
  • Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
    <code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>
  • Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
  • Want more info? How to link or How to display code and escape characters are good places to start.
Log In?
Username:
Password:

What's my password?
Create A New User
Domain Nodelet?
Chatterbox?
and the web crawler heard nothing...

How do I use this?Last hourOther CB clients
Other Users?
Others chilling in the Monastery: (9)
As of 2024-03-28 09:24 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    No recent polls found