[ale] 2 questions memory related

[Scott Castaline]

Sorry for replying to a reply, but to Mike, htop is showing 16 incidents of
mysql, whereas top is only showing 1. Each incident is using 1.0% of memory.
I also noticed several incidents of kworker* running of which (about 20) I
don't remember the %Mem for each.

On Fri, Jun 17, 2011 at 12:07 PM, Scott Castaline <skotchman at gmail.com>wrote:

> 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
>>>> _______________________________________________
>>>> Ale mailing list
>>>> Ale at ale.org
>>>> http://mail.ale.org/mailman/listinfo/ale
>>>> See JOBS, ANNOUNCE and SCHOOLS lists at
>>>> http://mail.ale.org/mailman/listinfo
>>>>
>>>
>>> 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?
>>>
>>> _______________________________________________
>>> Ale mailing list
>>> Ale at ale.org
>>> http://mail.ale.org/mailman/listinfo/ale
>>> See JOBS, ANNOUNCE and SCHOOLS lists at
>>> http://mail.ale.org/mailman/listinfo
>>>
>>>
>>
>> _______________________________________________
>> Ale mailing list
>> Ale at ale.org
>> http://mail.ale.org/mailman/listinfo/ale
>> See JOBS, ANNOUNCE and SCHOOLS lists at
>> http://mail.ale.org/mailman/listinfo
>>
>>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://mail.ale.org/pipermail/ale/attachments/20110617/cdf88ed0/attachment.html