swap space usage behaviour 2.2/3

swap space usage behaviour 2.2/3

Post by Eckhard Rueggebe » Sat, 11 Dec 1993 20:10:42



Did Sun change something in the usage of swap space between 2.2 and 2.3 ?
We have a program here, which has a bug in it. Its memory image grows and grows. In 2.2, it growed until swap space was completely exhausted, in 2.3
it grows to some 20100 pages = around 80 MB and then hangs, although the
swap space is around 180 MB :

swapfile             dev  swaplo blocks   free
/dev/dsk/c0t3d0s1   32,25      8 166312 137920
/usr/export/SWAP      -        8 204792 173008

I  didn't save the exact figures with the program*, but both swap
areas were used up to the same percentage alledgedly...

---
Eckhard R"uggeberg

 
 
 

swap space usage behaviour 2.2/3

Post by Charles Hedri » Mon, 13 Dec 1993 09:06:17



>Did Sun change something in the usage of swap space between 2.2 and 2.3 ?
>We have a program here, which has a bug in it. Its memory image grows and grows. In 2.2, it growed until swap space was completely exhausted, in 2.3
>it grows to some 20100 pages = around 80 MB and then hangs, although the
>swap space is around 180 MB :

I've seen the same thing under 2.3.  I run out of swap space even
when swap -l says I have plenty, and the total size of the programs
being run should not be a problem.  Sounds like a bug to me.

 
 
 

swap space usage behaviour 2.2/3

Post by Larry W. Vird » Wed, 15 Dec 1993 02:11:20


Swap and /tmp share space now - if your /tmp is full, then you probably
are going to be running shy of swap space.
--
:s Great net resources sought...

:s Personal: 674 Falls Place,   Reynoldsburg, OH 43068-1614
The task of an educator should be to irrigate the desert not clear the forest.
 
 
 

swap space usage behaviour 2.2/3

Post by Pete Hartm » Wed, 15 Dec 1993 04:51:54



Quote:>Swap and /tmp share space now - if your /tmp is full, then you probably
>are going to be running shy of swap space.

Only if you run tmpfs (in my opinion a very silly thing to do unless you
have bazillions of disk space to waste to make sure you don't run out
of swap).
--

         Her voice sounded like something that lurks in the long grass,
                   visible only by the twitching of its ears,
                  until something young and tender wobbles by.
 
 
 

1. plenty of swap space, but keep receiving error "swap space limit exceeded"

Syslog reports
  unix: WARNING: /tmp: File system full, swap space limit exceeded

But

  Filesystem            kbytes    used   avail capacity  Mounted on
  swap                 2423720   48480 2375240     3%    /tmp

The host:
  SunOS <hostname> 5.7 Generic_106541-16 sun4u sparc SUNW,Ultra-60

I ran vmstat 1 for some time and watched for available swap space to
go to zero. But the lowest it would go is 75kB.

When analyzing this problem, I ran into the following error twice, but
for different commands:
  Can't run command <command>
  fork(2) failed; no more memory

What's going on?

Thanks.

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