Re: Disk Cache Settings, RAM Disks & Virtual Memory

[Rob Jennings]

I'm not sure I was being very clear.  My intent is to minimize hard 
drive access and speed the serving of Web pages by storing them in a 
RAM disk.  But because my IIci runs headless, I'll need a way to 
periodically update the Web pages in the RAM disk from another computer 
on my network.

Thank you and the pickle for your help!

Rob

On Tuesday, September 17, 2002, at 08:00  PM, Gamba wrote:
>> Can you file share and then mount a RAM disk over a network?
>
> Yes, but I doubt that any speed is gained over the network.
> Ram disk speeds things up when the transfer is RAM to RAM.


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Re: Disk Cache Settings, RAM Disks & Virtual Memory

[the pickle]

At 19:00 -0700 on 17/09/02, Gamba wrote:

>>Can you file share and then mount a RAM disk over a network?
>
>Yes, but I doubt that any speed is gained over the network.
>Ram disk speeds things up when the transfer is RAM to RAM.

It'll stop all the constant HD thrashing when serving WWW files from disk ;)
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Re: Disk Cache Settings, RAM Disks & Virtual Memory

[Gamba]

>Some sources suggest allocating 32KB per 1MB of RAM to the disk cache.

IMHO, use 128K. Any more is a waste.

>Can you file share and then mount a RAM disk over a network?

Yes, but I doubt that any speed is gained over the network.
Ram disk speeds things up when the transfer is RAM to RAM.

>What about virtual memory?

Turn it OFF.
It just slows things up and provides another source for bugs, via
compatibility issues.

Gamba




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Re: Disk Cache Settings, RAM Disks & Virtual Memory

[the pickle]

At 18:37 -0600 on 17/09/02, Rob Jennings wrote:

>gains when the disk cache is set higher than 512KB.  I want to increase
>disk access performance when serving Web pages in particular.
>
>What about using RAM disk software like AppDisk to create a RAM disk in
>which to store my Web pages and images, or even some of the server

That would be FAR faster than mucking about with disk cache.

>applications?  I'm certain I can spare the RAM.  Can you file share and
>then mount a RAM disk over a network?  My IIci runs headless and I need

Not sure; you could certainly try it easily enough :)

>What about virtual memory?  I believe Apple recommends turning it on,
>even minimally, to decrease the amount of memory used by applications,

Generally only applicable on PPCs.
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Disk Cache Settings, RAM Disks & Virtual Memory

[Rob Jennings]

I'm trying to determine the optimum disk cache and virtual memory 
settings for my Macintosh IIci running OS 7.6.1.  I am installing a 
IIci cache card and 32MB of RAM.  I have an internal 350MB HD and an 
external SCSI 1GB Jaz drive.

I'm looking for the best settings for my particular application.  My 
IIci is a router, email server, Web server and occasional file server, 
however, its primary function is routing.

Some sources suggest allocating 32KB per 1MB of RAM to the disk cache.  
This would indicate I should allocate 1MB to the disk cache.  On the 
other hand, I have seen benchmarks indicating negligible performance 
gains when the disk cache is set higher than 512KB.  I want to increase 
disk access performance when serving Web pages in particular.

What about using RAM disk software like AppDisk to create a RAM disk in 
which to store my Web pages and images, or even some of the server 
applications?  I'm certain I can spare the RAM.  Can you file share and 
then mount a RAM disk over a network?  My IIci runs headless and I need 
to be able to update the Web pages from my iMac.

What about virtual memory?  I believe Apple recommends turning it on, 
even minimally, to decrease the amount of memory used by applications, 
but I doubt it would be worth the decrease in performance in this 
situation.  I'm not running any memory hungry desktop applications.

Thanks in advance for any advice.

Thanks,

Rob


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