Memory Leak Observed in Erlang Application -


let me put question simple below. mine network router software built in erlang, @ particular scenario observing high memory growth shown vm.

have 1 process receives binary packet other process socket.

process, parses binary packet , passes binary packet gen_server (handle_cast called)

gen_server again stores information in ets table , send packet peer server.

when peer server responds entry ets deleted , gen_server responds first process

if first process (which sent packet gen_server) gets timedout after 5 seconds waiting response gen_server , deletes ets entry in gen_server , exits.

observing high memory growth when lots of events gets timed out (due unavailability of peer server) , have researched "**binary**" , "**processes_used**" given erlang:memory command thats using of memory.

same not true when events processed successfully.

the memory lost can in 3 places:

  1. the state of gen_server

    • look @ state, find out if there big or growing stuff there

  2. your processes mailboxes

    • see there way drain unmatched messages (for gen_server handle_info callback) in normal receives any ->clause.

    • if mailbox fills temporarily because of receiving process being slow rate of messages produced. problem asynchronous communication. if temporary bursts don't break intended.

      • in case can either optimize receiving process

      • or fix protocol use fewer messages

      • if have multiple functions receive messages, make sure receiving parts being called regularly. dont forget any -> clauses.

    • be aware while processing in gen_servers callback no messages received, if need more time in callback necessary asyncronous messages might pile (e.g. random message arrival + fixed processing time builds unbounded growing queue, details see queueing theory

  3. in ets table

    • maybe information in ets not removed? forgot remove in cases?

Comments

Post a Comment

Popular posts from this blog

apache - Add omitted ? to URLs -

i working on website cms reads page name of query string, e.g. http://exmaple.com/?pagename . trying create rewrite rule rewrite ? . so, user types in /pagename , taken /?pagename try this: rewriteengine on rewritecond %{request_filename} !-d rewritecond %{request_filename} !-f rewriterule ^/?(.*) index.php?$1 [l]
Read more

redirect - bbPress Forum - rewrite to wwww.mysite prohibits login -

i using bbpress installation without wordpress integration. the redirect of rewriteengine @ forum site works: rewriteengine on rewritecond %{http_host} ^forum.mysite.com$ rewriterule (.*)$ http://www.forum.mysite.com/$1 [r=301,l] the problem login pppress. bbpress login not recognize: http://www.forum.mysite/bb-login.php . it redirects to: http://forum.mysite.com/bb-login.php . i tried permalink settings none , name based, same issue. does uses redirect in bbpress or how can eliminate "double" content , redirect permanently www.? i redirected www.forum.mysite.com forum.mysite.com , achieved eliminate "double" content.
Read more

php - How can I stop spam on my custom forum/blog? -

so have custom built forum & blog system of late has been dealing lot of spam. if wordpress use akismet, if different common platform i'm sure i'd find plugin. there kind of static class can download this? using php. i'd still go akismet, if it. uses outside of wordpress, may have pay fee it, depending on use -- check terms , conditions -- it's option , easy implement in php using api. use api key wordpress. com account access. basically, grab whichever php client library takes fancy -- use alex potsides' php5 library -- plug in key, , it's handful of lines of code. here's bare bones of validation straight 1 of live sites: ... if ($akismet) { $akismet->setcommentauthor($name); $akismet->setcommentauthoremail($session->userinfo["email"]); $akismet->setcommentauthorurl(""); $akismet->setcommentcontent($sentence);...
Read more