How much RAM is needed for FreeBSD
Greg 'groggy' Lehey
grog at FreeBSD.org
Sat Apr 5 16:52:51 PST 2003
[Format recovered--see http://www.lemis.com/email/email-format.html]
On Saturday, 5 April 2003 at 14:33:37 -0600, Alfonso Romero wrote:
> On Saturday, April 05, 2003 10:23 AM, Clemens Jaeger wrote:
>> I was looking for information : how much RAM is needed to run FreeBSD on
>> a Pentium Computer?
>> There is no information on your website / documentation for Version 5.0
> well, but if you try to use GNOME... with 32MB it took my Pentium
> 133Mhz PC 30 minutes to load the environment!
You certainly shouldn't be running memory-hungry suites like GNOME or
KDE on systems with minimal memory.
On Saturday, 5 April 2003 at 11:41:59 -0800, Kent Stewart wrote:
> On Sunday 06 April 2003 12:06 pm, kitsune wrote:
>> On Sat, 5 Apr 2003 12:59:23 -0500, Matthew Emmerton wrote:
>>>> On Sat, 05 Apr 2003 18:23:18 +0200
>>>> Clemens Jaeger wrote:
>>>>> I was looking for information : how much RAM is needed to run
>>>>> FreeBSD on a Pentium Computer? There is no information on your
>>>>> website / documentation for Version 5.0
>>>> should be something like 4Mb, iirc
>>> *cough*. You haven't tried to install FreeBSD since the 2.2.x days
>>> then :)
>>> My recommendation is no less than 16MB.
I think this is a valid minimum. We're pretty sure that we can no
longer install in 8 MB. It's possible that it would work in 12 MB,
but where do you find systems with that amount of memory?
>> What was it like back then?
It was generally possible in 4 MB in those days. We've seen cases of
really trimmed kernels booting in 2 MB.
>> Yeah, 16 works nicely, which is the smallest amount of ram I've
>> ever had in a machine I installed FreeBSD on.
For some definition of "nicely". Don't expect a ball of flame.
> I think numbers like this border on meaningless. They are basically
> what you need to just run the system.
Well, sure, but that has a meaning. There are a number of
applications, notably in networking, which don't need much more than
minimum memory. As I observed above, you're not going to run X with a
bloatware desktop on it. Expect to use at least 64 MB for that.
> If you want to use it for something real, then you need more. How
> much more depnds on what you want to do. For example, to use
> X-Windows, you need 50-64MB just for X.
You can run X in 32 MB. You need *much* more memory for
Microsoft-like programs such as newer "desktops" and OpenOffice.
I did some research on this while writing the relevant chapters for
the fourth edition of "The Complete FreeBSD", which should be out soon
(http://www.oreilly.com/catalog/cfreebsd/index.html). I had intended
to describe only KDE or GNOME. After seeing how much memory they used
and how little advantage you get from it, I added the alternative of
fvwm2. It's not as easy to configure, but it runs in about 5% of the
memory footprint, and it gives you just about all the functionality.
> If you want to do a buildworld, you need Y MBs.
Building the world is relatively easy on the system.
> You need Y MB to run an application.
For some other definition of Y?
> If you want to do all of the above at the same time, then you have
> to assign values to Y and add what is appropriate together. I think
> the smallest machine that I used and didn't see a lot of swapping
> was 128 MB. Swapping drops your effective memory speed from 8ns to 8
Well, not quite. You get a page of instructions each time you swap.
When replying to this message, please copy the original recipients.
If you don't, I may ignore the reply or reply to the original recipients.
For more information, see http://www.lemis.com/questions.html
See complete headers for address and phone numbers
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Size: 187 bytes
Desc: not available
Url : http://lists.freebsd.org/pipermail/freebsd-questions/attachments/20030406/a2c9847e/attachment.bin
More information about the freebsd-questions