[Info-vax] V9.2-1 Page file size

[Arne Vajhøj]

On 2/25/2024 3:37 AM, Jim Duff wrote:
> On 25/2/24 11:33, Chris Townley wrote:
>> On 25/02/2024 00:12, Arne Vajhøj wrote:
>>                                                            VMS want
>>> pagefile backing of virtual memory even if it is not likely to
>>> need it. And running out of pagefile space is bad - very bad. So I got
>>> 1 x 8 GB pagefile on my VMS x86-64 and 3 x 1 GB pagefile on
>>> my VMS Alpha (can't remember what I have on my VMS Itanium).
>>
>> But VSI recommended 8Gb memory, and an 8Gb system disk. So how do we 
>> fit that in? Especially if they want another 8Gb for the dump file

> In a hobbyist situation, do you need a page file that large?  Unless you 
> have an app that uses masses of memory, you can probably get away with 
> something smaller.  I have 6GB of memory with 3GB of page file, and I 
> rarely use more than 1% of the page file.

On my system @sys$startup:tomcat$startup and
@sys$startup:activemq$startup without even using them
bump usage to 600 MB.

> In a hobbyist situation, do you need a dump file?  Unless you're doing 
> kernel mode development, perhaps not.  Set DUMPBUG=0 in MODPARAMS.DAT, 
> reboot, and delete the dump file.
> 
> If you do want a dump file, you can probably get away with something 
> much smaller by specifying an appropriate value for DUMPSTYLE in 
> MODPARAMS.DAT.  You should at least compress the dump by setting bit 3, 
> and choose other bits for that parameter based on your circumstances.
> 
> Remember, if a dump file doesn't exist either in SYS$SYSTEM: or in a 
> DOSD location that you've specified, VMS will use the page file to write 
> the crash dump.

Yes. Unless one really are into reading crash dumps, then
dumps are not so much fun.

Arne