Beefy Boxes and Bandwidth Generously Provided by pair Networks
Perl-Sensitive Sunglasses

Re^3: OS memory reclamation with threads on linux

by jbert (Priest)
on Aug 27, 2008 at 19:58 UTC ( #707286=note: print w/ replies, xml ) Need Help??

in reply to Re^2: OS memory reclamation with threads on linux
in thread OS memory reclamation with threads on linux

I watch the %MEM columns in top/ps

Well, that's proportional to RES, it's the amount of physical memory used by the app at that moment (including all loaded libs and possibly shared memory). It only reflects your apps "memory usage" if the box isn't under memory pressure (i.e. too much running at once). If your box *is* under memory pressure, then RES and %MEM will relate to what the OS is running at that moment - that figure will go down when bits of your app is paged out for something else to run, even though your app is still "using the same amount of memory" (i.e. it hasn't free'd anything).

My real question is what are people talking about when they claim their threaded apps are increasing in memory.

My first guess would be that they've just got a good old-fashioned memory leak.

The OS generally makes good decisions regarding memory use. The best advice is to not worry about it too much until you have a problem app, unless you're into learning things (which is cool).

Comment on Re^3: OS memory reclamation with threads on linux

Log In?

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://707286]
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others musing on the Monastery: (6)
As of 2014-09-21 07:48 GMT
Find Nodes?
    Voting Booth?

    How do you remember the number of days in each month?

    Results (167 votes), past polls