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>>From:  KARLHANK[UNIX.KARLHANK] @ TRSSW
>>Sent: Tue 02/28/95 18:13 EST      Delivered : 03/01/95 01:45
>>Subject: Memory needs
 
>>I would like some advice concerning performance enhancements on a 992/200.
>>I am fairly new at managing this HP system and spent some time looking through
>>Glance's memory detail screen.  The system currently has 704MB of memory and
42GB of disk space.
>>Typically 200-300 VT sessions.
 
>>The memory detail shows that memmgr doesn't use over 5% cpu.
>>Page overlay cadidate rate varies widely but can go as high as 800/sec.  Over
30 is common.
>>Clock cycle rate is at 7
>>Page fault rate varies widely but is usually  (way) over 30
>>System library fault rate is consistently very low 0.1 or less/sec.
 
>>Reading the Glance manual tells me that some of these indicators mean that I
should install more memory.
>>How does this compare with your experienced opinions?
 
>>Thanks
 
I manage 4 992/400 systems which are similar in some respects to your
configuration. Here are details from
the two Production systems :
 
                                                 Prod1
Prod2
Memory config                    1024Mb                      896Mb
# users                                    280
216                   (these numbers often rise to 350 & 300)
of which DTC                          32                                  78
& VT                                        240
138
 
memmgr activity                   <1%                             <2%
page overlay rate               200-400/sec               200-350/sec
clock cycle rate                     21                                   0
page fault rate                        62                                  80
sys lib fault rate                      0.3                                  0.6
 
I suspect that Glance manual was written way before Emerald systems were around
and that its advice
is not appropriate for these bigger system . On the other hand it could have
been written by a salesman !
 
I would place more importance on what the memory bar chart at the top of any
Glance screen told me.
As long as you have a healthy portion given over to file pre-fetching (or
cacheing) shown as F , then
you probably have plenty of memory to spare. I upgraded memory to our current
configuration when
last night's batch over-run was squeezed for memory by today's online demand.
 
Hope this helps, Tony
 
 
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