resident set size vs. real memory

resident set size vs. real memory

Post by gsheb.. » Tue, 02 May 2000 04:00:00



hi there...

i have noticed something that seems odd on my solaris hosts...

using the ps command it is possible to look at the resident set size
(rss) parameter of each process... it is my understanding that the value
of rss indicates how much real memory the process is using...

if i sum up all of the rss values for each process, i sometimes find
that the sum is greater than the available real memory installed in the
system...

obviously this is not possible so i must be misinterpreting what rss
means... can someone explain this?

-greg-

Sent via Deja.com http://www.deja.com/
Before you buy.

 
 
 

resident set size vs. real memory

Post by Boris Goldber » Tue, 02 May 2000 04:00:00



> hi there...

> i have noticed something that seems odd on my solaris hosts...

> using the ps command it is possible to look at the resident set size
> (rss) parameter of each process... it is my understanding that the value
> of rss indicates how much real memory the process is using...

No, RSS is just that: pages currently in RAM. Some of them maybe shared,
just
like pages which are currently in swap.
Quote:

> if i sum up all of the rss values for each process, i sometimes find
> that the sum is greater than the available real memory installed in the
> system...

> obviously this is not possible so i must be misinterpreting what rss
> means... can someone explain this?

> -greg-

> Sent via Deja.com http://www.deja.com/
> Before you buy.


 
 
 

1. xterm: huge process size and resident set size

Solaris 9 FCS with Recommended patches through approx. October 2002;
CDE.

What causes an xterm to hang for on the order of a minute when I
resize it? The system is banging noisily on the disk the whole time. I
have approx. 720 MB of free swap out of a GB, 320 MB RAM, and / is
less than 50% full. This is an Ultra 10/ 300 MHz, but I have seen
similar behavior on many other systems and at other installations, so
I'm convinced that it's either an xterm or a Solaris issue.

The scroll-back log is not even that large (although I always start my
xterms with "-sl 10000" (ten thousand lines max scrollback).

I see that the xterm process size is 145M and RSS is 134M, so that
seems to be the immediate cause of the performance issue. The question
then becomes, what could cause those numbers to be so large?, because
most of my other xterms have sizes around 20MB and RSSs of around 3MB.

Thanks for any suggestions.

--Bruce

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