[Solaris 2.5.1, ULTRA Enterprise 2, 896MB RAM, DCE 1.1]
This system is eating RAM for breakfast, lunch, and supper, and I
can't figure out where it's going. It was thrashing badly with
128MB, not as badly with 256MB or 896MB. Adding up the resident
sizes yields less than 100MB.
I'd appreciate any information that would help me figure out
what's going on here, and how I can fix it. Let me know if you
need further info.
And included copies of top, vmstat, ps, and sar output.
The bottom line is that the memory is being used for buffer
cache. Casper Dik wrote:
>It's filesystem cache. The system will not throw away cached
>data until it runs out of free pages.
>The only reliable measurement of memory shortage is the scan
>Memory is seldom freed (except when applications exit and their
>private anonymous memory becomes unreferenced)
A couple people suggested using memtool,
http://playground.sun.com/pub/memtool, to see where it was being
used. I did, and it worked great.
I also discovered that 2.6 and 7/2.7 have an improved paging algorithm
called "priority paging" that helps keep the buffer cache from using
too much memory (it's not available for 2.5.1 yet). See
Thanks to everyone who replied.
This archive was generated by hypermail 2.1.2 : Fri Sep 28 2001 - 23:12:52 CDT