[179898] in North American Network Operators' Group
Re: Rasberry pi - high density
daemon@ATHENA.MIT.EDU (Hugo Slabbert)
Mon May 11 18:24:40 2015
X-Original-To: nanog@nanog.org
Date: Mon, 11 May 2015 15:24:19 -0700
From: Hugo Slabbert <hugo@slabnet.com>
To: Rafael Possamai <rafael@gav.ufsc.br>
In-Reply-To: <CAJB2g-H2TynUkW4YS7yA5SGpXg9AigSCnpLCdZG2jddo8V7g7w@mail.gmail.com>
Cc: "nanog@nanog.org" <nanog@nanog.org>
Errors-To: nanog-bounces@nanog.org
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>Did I miss anything? Just a quick comparison.
If those numbers are accurate, then it leans towards the NUC rather than=20
the Pi, no?
Perf: 1x i5 NUC =3D 10x Pi
$$: 1x i5 NUC =3D 10x Pi
Power: 1x i5 NUC =3D 5x Pi
So...if a single NUC gives you the performance of 10x Pis at the capital=20
cost of 10x Pis but uses half the power of 10x Pis and only a single=20
Ethernet port, how does the Pi win?
--=20
Hugo
On Mon 2015-May-11 17:08:43 -0500, Rafael Possamai <rafael@gav.ufsc.br> wro=
te:
>Interesting! Knowing a pi costs approximately $35, then you need
>approximately $350 to get near an i5.. The smallest and cheapest desktop
>you can get that would have similar power is the Intel NUC with an i5 that
>goes for approximately $350. Power consumption of a NUC is about 5x that of
>the raspberry pi, but the number of ethernet ports required is 10x less.
>Usually in a datacenter you care much more about power than switch ports,
>so in this case if the overhead of controlling 10x the number of nodes is
>worth it, I'd still consider the raspberry pi. Did I miss anything? Just a
>quick comparison.
>
>
>
>On Mon, May 11, 2015 at 4:40 PM, Michael Thomas <mike@mtcc.com> wrote:
>
>> As it turns out, I've been playing around benchmarking things lately usi=
ng
>> the tried and true
>> UnixBench suite and here are a few numbers that might put this in some
>> perspective:
>>
>> 1) My new Rapsberry pi (4 cores, arm): 406
>> 2) My home i5-like thing (asus 4 cores, 16gb's from last year): 3857
>> 3) AWS c4.xlarge (4 cores, ~8gb's): 3666
>>
>> So you'd need to, uh, wedge about 10 pi's to get one half way modern x86.
>>
>> Mike
>>
>>
>> On 5/11/15 1:37 PM, Clay Fiske wrote:
>>
>>> On May 8, 2015, at 10:24 PM, charles@thefnf.org wrote:
>>>>
>>>> Pi dimensions:
>>>>
>>>> 3.37 l (5 front to back)
>>>> 2.21 w (6 wide)
>>>> 0.83 h
>>>> 25 per U (rounding down for Ethernet cable space etc) =3D 825 pi
>>>>
>>>> Cable management and heat would probably kill this before it ever
>>>> reached completion, but lol=E2=80=A6
>>>>
>>>
>>> This feels like it should be a Friday thread. :)
>>>
>>> If you=E2=80=99re really going for density:
>>>
>>> - At 0.83 inches high you could go 2x per U (depends on your mounting
>>> system and how much space it burns)
>>> - I=E2=80=99d expect you could get at least 7 wide if not 8 with the ri=
ght
>>> micro-USB power connector
>>> - In most datacenter racks I=E2=80=99ve seen you could get at least 8 d=
eep even
>>> with cable breathing room
>>>
>>> So somewhere between 7x8x2 =3D 112 and 8x8x2 =3D 128 per U. And if you =
get
>>> truly creative about how you stack them you could probably beat that
>>> without too much effort.
>>>
>>> This doesn=E2=80=99t solve for cooling, but I think even at these numbe=
rs you
>>> could probably make it work with nice, tight cabling.
>>>
>>>
>>> -c
>>>
>>>
>>>
>>
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