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From: Aaron W. Hsu on 15 Dec 2009 16:20
Mike Jones <Not(a)Arizona.Bay> writes:

>Next up, how to I force applications to RAM instead of disk? ;)

You need to find out how they are using the disk first. For that, you
need to actually do the top based analysis on your programs.

Aaron W. Hsu
--
A professor is one who talks in someone else's sleep.
From: Grant on 15 Dec 2009 17:00
On Tue, 15 Dec 2009 15:20:31 -0600, Aaron W. Hsu <arcfide(a)sacrideo.us> wrote:

>Mike Jones <Not(a)Arizona.Bay> writes:
>
>>Next up, how to I force applications to RAM instead of disk? ;)
>
>You need to find out how they are using the disk first. For that, you
>need to actually do the top based analysis on your programs.

Anything read from disk is buffered in memory automagically, so
where's the gain?

Grant.
--
http://bugsplatter.id.au
From: Mike Jones on 15 Dec 2009 19:48
Responding to Grant:

> On Tue, 15 Dec 2009 17:13:22 +0100, "goarilla(a)work"
> <kevindotpaulus(a)mtmdotkuleuven.be> wrote:
>
>>>>> 2 SATA HDDs and sometimes a fair bit of data transfer across the LAN
>>>>> to
> ...
>>maybe your hard drives are in PIO mode instead of (m|s)DMA
>
> SATA drives? I doubt it ;)
>
> Grant.


I get DMA stuff in the bootup screen stuff for the HDDs. That all seems
to be working fine.

--
*=( http://www.thedailymash.co.uk/
*=( For all your UK news needs.
From: Jerry Peters on 16 Dec 2009 16:42
Grant <g_r_a_n_t_(a)bugsplatter.id.au> wrote:
> On Tue, 15 Dec 2009 15:20:31 -0600, Aaron W. Hsu <arcfide(a)sacrideo.us> wrote:
>
>>Mike Jones <Not(a)Arizona.Bay> writes:
>>
>>>Next up, how to I force applications to RAM instead of disk? ;)
>>
>>You need to find out how they are using the disk first. For that, you
>>need to actually do the top based analysis on your programs.
>
> Anything read from disk is buffered in memory automagically, so
> where's the gain?
>
> Grant.

But isn't that part of his problem? A large copy evicts useful stuff
from memory to buffer something that will be read exactly once.

Jerry

From: Grant on 16 Dec 2009 16:53
On Wed, 16 Dec 2009 21:42:53 +0000 (UTC), Jerry Peters <jerry(a)example.invalid> wrote:

>Grant <g_r_a_n_t_(a)bugsplatter.id.au> wrote:
>> On Tue, 15 Dec 2009 15:20:31 -0600, Aaron W. Hsu <arcfide(a)sacrideo.us> wrote:
>>
>>>Mike Jones <Not(a)Arizona.Bay> writes:
>>>
>>>>Next up, how to I force applications to RAM instead of disk? ;)
>>>
>>>You need to find out how they are using the disk first. For that, you
>>>need to actually do the top based analysis on your programs.
>>
>> Anything read from disk is buffered in memory automagically, so
>> where's the gain?
>>
>> Grant.
>
>But isn't that part of his problem? A large copy evicts useful stuff
>from memory to buffer something that will be read exactly once.

Hmm, yes. I thought they fixed that? Been a long time since I cared
enough to explore the VM (virtual memory) settings -- so that might
still be the case.

So the question may be better put as 'how do I limit buffer space?'.

Grant.
--
http://bugsplatter.id.au
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