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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

 
 
 
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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.

 
 
 
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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.
 
 
 
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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.
 
 
 
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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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