Beefy Boxes and Bandwidth Generously Provided by pair Networks
XP is just a number
 
PerlMonks  

comment on

( #3333=superdoc: print w/replies, xml ) Need Help??
Threads have a big issue: they are not encapsulable.

You can not blindly create a thread in the middle of your program because doing it duplicates all the structures in the program memory. If your script is using 1Gb of memory and you create a thread, it immediately goes to 2Gb and if then you create another thread, it goes to 3Gb, etc. Replicating those data structures may also be quite expensive in terms of CPU usage.

For instance, imagine you want to query several HTTP servers in parallel. Threads look like a good match for that, so you build a module using threads, you test it and it runs fine. But then, when you use it from some data processing script that holds big datasets in memory everything goes nuts.

With the current thread support in Perl you can only use them at the high level designing your program around.


In reply to Re: Trying to Understand the Discouragement of Threads by salva
in thread Trying to Understand the Discouragement of Threads by benwills

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 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? | Other CB clients
Other Users?
Others chanting in the Monastery: (6)
As of 2022-08-07 19:04 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    No recent polls found

    Notices?