I was going to say the same thinga bout getting 32 Gb of ram. The main
reason most people get as much as 32Gb for their personal workstations
is for on-line gaming. Or if you are into creating virtual machines you
might be able to use 32Gb of ram. But here at the Math Department at the
UW, the only machines we have with 32Gb of ram are used for research
like modelling cloud formations. None of our web server, mail server,
database server, or file server have 32 GB of ram. I think you could
combine all 4 of those functions onto one server and still get by with
less than 32Gb of ram. If it was me, I'd spend my money on an SSD drive.
As for the cpu, at the Math department, we have bought nothing but Intel
I5 machines for the past several years. It used to be that Intel and AMD
would leapfrog each other with each new cpu release. But that hasn't
happened lately. I think the money Intel has been abel to spend on
research has put them ahead for good. I have a brand new PC on my desk
at work but I turned it off for the weekend. I can't see the cpu model
right now but I know it is some type of Intel I5. But the last 2 groups
of machines we bought had Intel I5-4570 and I5-4590 cpus. If you are
doing something that actually will use 32Gb of ram, you might get an
Intel I7 processor to go with that. But again, I'd spend my money on an
SSD drive.
On 07/16/2016 05:36 PM, Joel Roth wrote:
Hi John,
If you are working in the console, you won't generally need high
performance hardware. If you compile a lot of software, or
do disk intensive work, a solid-state disk is nice. I notice
powerful processors make a difference in compressing video
and any scientific computing.
A big issue in new hardware is uefi vs BIOS booting.
And in that motherboards shipped with the microsoft
signed boot loading restrictions.
http://www.rodsbooks.com/efi-bootloaders/secureboot.html
BIOS has been around a long time, and easy to deal with
in a linux environment.
Have fun,
Joel
John J. Boyer wrote:
Thanks for the information. I had forgotten some of the Linux terms,
such as swap file or partition. How do I go about setting up a tmpfs?
The installation will be command-line only Braille only Debian. I might
add a desktop later, but I don't want it to be automatically loaded at
boot time.
What CPU would be appropriae. I would guess something recent, but not
the latest.
Thanks,
John
On Sat, Jul 16, 2016 at 02:06:45PM -0400, Sam Hartman wrote:
"John" == John J Boyer <john.boyer@xxxxxxxxxxxxxxxxx> writes:
John> I've more or less decided to replacer my ten-year-old Linux
John> machine. It is giving error messages intermittently. Most of
John> them are about sector errors, but others seem to have nothing
John> to do with the hard drive. It may be more and more
John> troublesome, even if the hard drive is replaced. Besides, it
John> would be nice to get more up-to-date hardware.
John> I'm thinking of getting 32 GB of ram. 8 GB will be for normal
John> use. The other 24 GB will be in a ramdisk.
I think you must have a DOS background here.
An explicit RAM disk is rarely if ever useful on Linux. I'm tryinfg to
remember if I even know how to create a block device backed by RAM... O,
yeah, I can think of a way, but you probably don't want to do that.
Instead, you probably do want to create something called a tmpfs.
That's a filesystem backed by RAM. When your computer reboots all its
contents go away.
There are important differences between a tmpfs and a RAM disk.
The biggest is that Linux will only use as much RAM as is needed by the
tmpfs to store what currently lives in it.
(You can set a maximum size, but with 32g I wouldn't bother)
So, you can get the best of both worlds, storing your temporary files in
RAM, but using RAM for RAM if you don't have 24G of temporary files at
the moment.
John> Do I need a paging
John> file? 8 GB of available ram should be more than enough. The
John> paging file on my present machine always shows 0 usage, even
John> with only 4 GB of ram.
Having a paging file has a couple of affects even if it is not used, but
no, you probably don't want a swap partition or file (linux names for
paging)
John> How do I avoid setting up a paging file
John> during installation? I'm using Debian Jessie.
In expert mode, avoid creating a swap partition and if asked don't
create a swap file.
If you don't want to use expert mode, don't worry about it; having a
swap partition won't be a problem.
John> How do i set up the ramdisk? I want to assign the temp
John> directory to it.
I think the installer will do that by default.
But in /etc/fstab you want a line like
none /tmp tmpfs defaults 0 0
John> It might be nice if the
John> bin, sbin and usr
John> directories were loaded onto it at boot-up.
No need for that.
Linux is also smart enough to cache files as they are used, storing
copies in memory, so no value in moving them to the tmpfs.
The file will be loaded the first time it is used.
You could do that at boot for /bin, /sbin and /usr, but you probably
don't want to. The reason is that the system is fairly busy at boot,
and it would probably slow down things like bringing up your desktop and
starting system services. The only advantage of pre-caching files on
boot would be faster performance the first time you accessed a program
after pre-caching is done. However you get slower boot times and slower
performance during the pre-caching.
--
John J. Boyer; President,
AbilitiesSoft, Inc.
Email: john.boyer@xxxxxxxxxxxxxxxxx
Website: http://www.abilitiessoft.org
Status: 501(C)(3) Nonprofit
Location: Madison, Wisconsin USA
Mission: To develop softwares and provide STEM services for people with
disabilities which are available at no cost.
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