Beefy Boxes and Bandwidth Generously Provided by pair Networks
Your skill will accomplish
what the force of many cannot
 
PerlMonks  

Re^2: Pre-Forking Daemon with Parallel::ForkManager

by hippo (Chancellor)
on Oct 18, 2019 at 08:17 UTC ( #11107641=note: print w/replies, xml ) Need Help??


in reply to Re: Pre-Forking Daemon with Parallel::ForkManager
in thread Pre-Forking Daemon with Parallel::ForkManager

What I understand by "pre-forking daemon" (or more usually, "pre-forking server") is a process with a dynamic number of forked children which manages the child pool so that there are always some idle children waiting for client requests. This is done as a compromise to improve latency without committing vast amounts of memory. If there were a set number of children (say 64) then you might have a situation where all 64 of them are sitting around doing nothing just waiting for a request and hogging memory while it happens. OTOH, if you only fork a child when a request comes in the heavy act of forking introduces latency in the response. By having a stipulated, configurable range of "spare" children you get the best of both worlds. That's the theory, anyway.

Apache 1.x used this method and you can still run Apache 2.x this way if you choose (but most use a threaded MPM instead). PHP-FPM seems to use a similar mechanism as do some nameservers, etc.

  • Comment on Re^2: Pre-Forking Daemon with Parallel::ForkManager

Log In?
Username:
Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://11107641]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others surveying the Monastery: (5)
As of 2019-12-13 04:53 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    No recent polls found

    Notices?