| 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 |
Company Name : LMS NUMERICAL TECHNOLOGIES - Point 29588
Contact Name : Peter SEGAERT
Phone : 3216 384.500
Fax : 3216 384.550
Email : [email protected]
Date/Time in : 4-JUN-1997 09:01:31
Entered by : Ian Chamberlin
SPE center : REO
Category : unix
OS Version : 3.2
System H/W :
Brief Description of Problem:
-----------------------------
From: RDGENG::MRGATE::"RDGMTS::PMDF::mail.dec.com::Santing" 3-JUN-1997 21:29:04.72
To: RDGENG::ASAP
CC:
Subj: ESCALATION: POINT 29588 , Company LMS NUMERICAL TECHNOLOGIES - Leuven [BELGIUM]
From: NAME: Ben Santing <[email protected]@PMDF@INTERNET>
To: NAME: '[email protected]' <IMCEAX400-c=US+3Ba=+20+3Bp=DIGITAL+3Bo=SBUEURMFG+3Bdda+3ASMTP=asap+40reo+2Emts+2Edec+2Ecom+3B@mail.dec.com@PMDF@INTERNET>
Hello -
POINT Log Number 29588
Company Name LMS NUMERICAL TECHNOLOGIES - Leuven [BELGIUM]
Engineers name Peter SEGAERT
Telephone Number 3216 384.500
Fax Number 3216 384.550
E-mail Address [email protected]
Operating System, Version Digital Unix 3.2
Platform Alpha
Problem Statement
Our company develops, markets and supports SYSNOISE, a state-
of-the-art program for Numerical Vibro-Acoustic Analysis,
which runs on UNIX platforms of all major vendors and on
CONVEX and CRAY supercomputers.
One of our customers is experiencing problems when trying to
start the SYSNOISE program on a DEC ALPHAStation 200/233,
running OSF/1 3.2 and 64 MBytes of RAM. The program fails
to start, and the O/S returns the message :
*** Unable to get the requested swap space ***
When starting the SYSNOISE program, the user specifies an
option '-m' , which indicates how much (static) memory should
be allocated to the program using the *malloc* function.
Even when requesting only 4MBytes of RAM memory, we get the
message above ....
The contents of the /etc/fstab file is as follows :
root_domain#root / advfs rw 1 0
/proc /proc procfs rw 1 0
usr_domain#usr /usr advfs rw 2 0
/dev/rz0b swap1 ufs sw 0 2
/dev/rz1c /home ufs rw 1 2
The command '/sbin/swapon -s' returns the following info :
Swap partition /dev/rz0b (default swap):
Allocated space: 16384 pages (128MB)
In-use space: 2138 pages ( 13%)
Free space: 14246 pages ( 86%)
Total swap allocation:
Allocated space: 16384 pages (128MB)
Reserved space: 3672 pages ( 22%)
In-use space: 2138 pages ( 13%)
Available space: 12712 pages ( 77%)
Can you explain the reason for the error message above and
indicate a way to solve the problem ?? A swift reply would
be greatly appreciated.
Thanks in advance,
PETER SEGAERT
**********************************************************************
Ir. Peter SEGAERT LMS NUMERICAL TECHNOLOGIES
Technical Support Manager Interleuvenlaan 70
3001 LEUVEN - BELGIUM
Technical Support : [email protected] Tel : +32-16-384.500
Personal mail : [email protected] Fax : +32-16-384.550
**********************************************************************
Here is the displaying of the excution of the command rlogin,where wlh stands
for an user account name and the decb420 stands for hostname of my computer.
*******************************************************
rlogin -l wlh decb420
Password:
Last login: Sun Dec 15 00:17:56 on :0
DEC OSF/1 V3.2 (Rev. 214); Sun Oct 8 20:14:47 CST 1995
DEC OSF/1 V3.2 Worksystem Software (Rev. 214)
DEC OSF/1 Chinese Support V3.2 (rev. 12.1)
/var/adm/smlogs/wwinstall.log contains a log of the Worldwide Installation
The installation software has successfully installed your system.
There are logfiles that contain a record of your installation.
These are:
/var/adm/smlogs/install.log - general log file
/var/adm/smlogs/install.FS.log - file system creation logs
/var/adm/smlogs/setld.log - log for the setld(8) utility
/var/adm/smlogs/fverify.log - verification log file
***************************************************************
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| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 3705.1 | Swap allocation? (sent 04 Jun) | RDGENG::CHAMBERLIN | Danger! Do not Reverse Polarity | Fri Jun 06 1997 05:35 | 42 |
Peter, I'm replying to your ASAP request as above. The default swap allocation method for Digital Unix (formerly DEC OSF/1) requires that the full potential swap requirement is allocated when an application is started. If this cannot be achived, then you get the message you are seeing, although in the case you mention, available swap is ~96 Mb which seems adequate for most applications. Were other processes running at the time of failure, as opposed to when the swap figures were checked, in which case the available swap may be lower. This pre-allocation accounts for the difference between allocated and i -use swap as shown by swapon -s. I dont know how much swap your application actually needs. If you have a system where it does run, then you can see how much swap is actually used and allocated on the system(with swapon -s) and also check the virtual size of your application (vss from ps u) which is potentially how much it will need. If these figures are large (comparable with the available swap on the failing system) then this is the reason for the failure to start. In this case, you would need to add more swap space to the system (see the man page for swapon for details on how to do this). An alternative is to change the swap mode used by Digital unix from immediate (default) to deferred. This means that swap space for all applications is not allocated until actually needed. This has the advantage of allowing applications to start - the disadvantage is that if the system does run out of swap, then running applications will stop. Again, see man page for swapon for description of how to change the swap mode. Please advise me how you get on, and if you still have problems, with more details about the running size of your application and swap details of machines it runs on. regards, Ian Chamberlin Software Partner Engineering, Digital Equipment Corp, UK | |||||