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Conference hydra::axp-developer

Title:Alpha Developer Support
Notice:[email protected], 800-332-4786
Moderator:HYDRA::SYSTEM
Created:Mon Jun 06 1994
Last Modified:Fri Jun 06 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:3722
Total number of notes:11359

3429.0. "Semichem Inc." by HYDRA::AXPDEVELOPER (Alpha Developer support) Wed Apr 02 1997 16:56

    Company Name :  Semichem Inc.
    Contact Name :  Roy Dennington
    Phone        :  913.268.3271
    Fax          :  
    Email        :  [email protected]
    Date/Time in :   2-APR-1997 15:52:19
    Entered by   :  Robert Shen
    SPE center   :  MRO

    Category     :  unix
    OS Version   :  v4.0a
    System H/W   :  alpha


    Brief Description of Problem:
    -----------------------------

	Semichem's application (3d OpenGL) when running on Digital Unix V4.0a
	exhibits undue paging behavior causing the system to run very slowly.
	The system is AlphaStation 255/300 96MBytes PM 287Mbytes swap space.
	DU V4.0A. When VSS grows to arund 64 MBytes, the application is
	significantly slowed down.

	What can be done, such as sytem parameters tuning, othen than adding
	more physical memory to solve this problem ?
T.RTitleUserPersonal
Name		DateLines
3429.1sys parameter to tryHYDRA::SHENFri Apr 11 1997 19:3333
    To: [email protected]
    Cc: [email protected], shen
    Subject: system parameters to try on Digital Unix V4.0A
    Date: Wed, 02 Apr 97 15:53:00 -0500
    From: shen
    X-Mts: smtp
    
    
    Roy,
    
    	Thanks for you inquiry on Digital Unix V4.0A.
    
    	Please try setting the following system configuration parameter to
    see if the undue paging symptons are relieved:
    
    Add the following 2 lines to the file (at the beginning or end):
    
    ************************/etc/sysconfigtab*****************
    
    vm:
    	vm-page-free-optimal=1
    
    ********************end of  /etc/sysconfigtab ***********
    
    
    
    	reboot your system and run your application again.
    	Please let me know the result.
    
    Robert
3429.2reminder to semichem to try the suggestion...HYDRA::SHENFri Apr 11 1997 19:3548
    To: [email protected]
    cc: [email protected], shen
    Subject: Did you have a chance to try this sys para ? please let me
    know. thanx
    --------
    
    ------- Forwarded Message
    
    Return-Path: shen
    Received: from localhost by malamute.mro.dec.com;
    (5.65v3.2/1.1.8.2/26Jul95-0411PM)
    	id AA29180; Wed, 2 Apr 1997 15:53:00 -0500
    Message-Id: <[email protected]>
    To: [email protected]
    Cc: [email protected], shen
    Subject: system parameters to try on Digital Unix V4.0A
    Date: Wed, 02 Apr 97 15:53:00 -0500
    From: shen
    X-Mts: smtp
    
    
    Roy,
    
    	Thanks for you inquiry on Digital Unix V4.0A.
    
    	Please try setting the following system configuration parameter to
    see if the undue paging symptons are relieved:
    
    Add the following 2 lines to the file (at the beginning or end):
    
    ************************/etc/sysconfigtab*****************
    
    vm:
    	vm-page-free-optimal=1
    
    ********************end of  /etc/sysconfigtab ***********
    
    
    
    	reboot your system and run your application again.
    	Please let me know the result.
    
    Robert
    
    
    ------- End of Forwarded Message
3429.3semichem problem satisfactorily resolved; case closedHYDRA::SHENFri May 09 1997 12:4318
    Date: Tue, 29 Apr 1997 16:52:56 -0500
    From: "Roy Dennington" <[email protected]>
    To: [email protected]
    Subject: Re: Did you have a chance to try this sys para ? please let me
    know. thanx
    Content-Type: Text/Plain; charset=US-ASCII
    Content-Disposition: Inline
    
    Robert,
    
    Sorry for the delay. The suggested change did ease the rigormortis. I
    also
    tracked a memory problem (in my code) that consumed large quantities of
    memory unnecessarily. The 64-bit pointers were killing me! The bottom
    line is I fixed the problem. Thanks for your help.
    
    Roy