[ale] 2 questions memory related

[Scott Castaline]

My only concern was that there seems to be some emphasis on sets and that
RMA required returning complete sets. I was thinking of getting just one
stick of the same exact one for replaceing the bad one (Brand/Model) rather
than getting another set of 4 sticks so that I'm not down waiting for the
replacement. I understand that I need to match CAS/RAS specs and that was my
intent. I just had the impression that mfg required you to get complete sets
instead of buying individual sticks. I may be just picking up on marketing
ploy and not really technical truths.

On Fri, Jun 17, 2011 at 9:09 AM, Greg Clifton <gccfof5 at gmail.com> wrote:

> I agree with Mike on the RAM. The important thing is to match the spec as
> closely as possible, not just the clock speed but CAS/RAS. If your bad RAM
> is branded, you should be able to go to the manufacturer's web site and get
> the specs. It is also possible that it is lifetime guaranteed RAM so you
> could get it replaced free. Other than that, most any brand is fine, the're
> all darned good these days.
> GC.
>
>
>
> On Fri, Jun 17, 2011 at 7:58 AM, Scott Castaline <skotchman at gmail.com>wrote:
>
>>
>>
>> On Thu, Jun 16, 2011 at 10:08 PM, Michael B. Trausch <mike at trausch.us>wrote:
>>
>>> On 6/16/2011 8:01 PM, Scott Castaline wrote:
>>> > 1. Just had 1 stick 2GB of RAM go bad. I had originally bought as part
>>> > of a set of 4 sticks for a total of 8GB. My question is how critical
>>> > is it to buy in matched sets? Couldn't I buy just a replacement for
>>> > that stick? I don't overclock so I don't push them so I can't see
>>> > where I have to have handpicked memory. I would plan on getting the
>>> > same exact mfg part on a single stick basis.Am I wrong tinking this
>>> way?
>>>
>>> You should be fine ordering the part separately. The only thing that you
>>> need to be sure of is that you match the specs of the memory that is in
>>> the system currently.
>>>
>>> > 2. I am currently running dd if=/dev/urandom of=/dev/sde on a new 2TB
>>> > drive. I was logged into my GUI desktop (KDE) and after several hours
>>> > my desktop started disintegrating and window apps were becoming
>>> > unrecognisable, but I was able to close ot most of them. I switched
>>> > over to one of the text VTs and top was reporting that out of 4GB of
>>> > RAM I only had less than 500MB available and I was starting to use
>>> > swap. I've done this in the past with only 4GB of RAM on different
>>> > hardware and earlier version of Fedora, without any problems like
>>> > this. I'm not doing anything that different than in the past. My
>>> > question is, what command(s) would tell me what is actually hogging
>>> > all of the RAM? I don't want to kill the process as I'm anticipating
>>> > it aking about 4 days to complete. At least on a 2 core AMD it toke
>>> > about 44 hours for 1TB, I'm not sure how much quicker a 4 core
>>> > processor will do this. I was also running 800MHz RAM then, now I'm
>>> > running 1333MHz RAM of course I realize that that is not the real
>>> > speed of the bus clock.
>>>
>>> The 'dd' process is not going to run (significantly) differently on a
>>> multicore/multiprocessor system than on a unicore/uniprocessor system;
>>> nor would it likely if it were written to be a multithreaded program.
>>> The reason is that bandwidth limitations are going to be the bottleneck
>>> of the command. Even on a system that can generate pseudorandom bytes
>>> more quickly, the hard disk drives are going to be the limiting factor.
>>>
>>> In order to find out which process is hogging memory, I'd recommend
>>> "htop". Be sure to sort the output by the MEM% column.
>>>
>>>     --- Mike
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>>
>> Will htop give me much different results than top? I found on top sorting
>> by %mem that mysqld was at 1.0 which in my opinion is not a hog, but I'm not
>> sure why it is there as I didn't install mysql unless some other app usees
>> it. Also is it possible that it's not just a process but several processes
>> used to do a certain task. I have noticed several proceses named khelper?
>> where the ? is a different number for each one and there were others like
>> that. I don't remember seeing these in earlier versions of Fedora.
>>
>> Also any recommendations on memory brands/model?
>>
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>>
>
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