peter@hp-pcd.UUCP (08/25/83)
#N:hp-pcd:19500002:000:1392
hp-pcd!peter Aug 24 08:38:00 1983
We are currently running 4.1bsd on a VAX-750 and are investigating methods
to increase the performance of the system. Our program mix is basically
editing, compiling, and text formatting, with no large numerical analysis
type programs. Our three discs have been configured along the guidelines
suggested in "Installing and Operating 4.1bsd", with ample swap space and
fairly good balance.
I would appreciate any tips or comments on ways to improve performance, with
special interest in:
1. memory
We currently have 2Mb of memory. Once enough memory has been added to
eliminate memory-manager paging and swapping, can additional benefit
be derived by adding more memory above and beyond? Also, is anybody
running more than 4Mb in a 750?
2. system tuning
Are there any system parameters which can be modified to take advantage
of additional memory and improve performance?
3. system metering
Are there any tutorials or papers on the instrumentation variables
available in "/sys/h/vmmeter.h"?
I am also looking for leads to a performance test suite for the VAX which would
enable us to empirically test changes in configurations for performance
differentials. Either public or private domain would be acceptable.
Thanks,
Peter Robinson
Hewlett-Packard PCD
ucbvax!hplabs!hp-pcd!peter
harpo!hp-pcd!peterreece%nadc@sri-unix.UUCP (12/20/83)
If one had a chunk of money to spend, what would be the best things to buy to improve performance on a standard VAX 11/780 running Berkeley UNIX? Standard means 1 memory controller, 3 mba's, 1 uba, 4 mb memory, 1 RM03, 3 RM05, Floating point accelerator. Any suggestions or experience either way would be appreciated. Jim Reece REECE@NADC
guy@rlgvax.UUCP (Guy Harris) (01/13/84)
Right - the V7 file system with 1024-byte blocks that System V uses is
*so* much faster than the 4.2BSD file system. Yup. Well, maybe I'm
naive but I tend to believe Berkeley's figures which show that the
V7 file system with 1024-byte blocks that 4.1BSD has is noticeably slower
than the 4.2BSD file system.
Guy Harris
{seismo,ihnp4,allegra}!rlgvax!guykiessig@idi.UUCP (01/16/84)
Has anyone done any firm studies comparing the CPU and
filesystem throughputs of System V vs. 4.2bsd?
Rick
--
Rick Kiessig
{decvax, ucbvax}!sun!idi!kiessig
{akgua, amd70, cbosgd, ihnp4, ios}!idi!kiessigchris@basservax.SUN (Chris Maltby) (01/17/84)
To provide a large performance increase for 780 systems, buy enough memory to fit your applications in completely and change 4.2 for system V.