On Thu, 19 Jun 2003, Tzafrir Cohen wrote:
> On Thu, Jun 19, 2003 at 04:47:38AM +0800, John Summerfield wrote:
> >
> > Instruction sets, integer formats, address formats, addressing modes all
> > conspire against you.
> > Mosix and openmosix are only usable on machines with the same
> > architecture.
> >
> > Conceivably you could use either on S/390, but all members of the
> > cluster would have to be S/390 (or zBoxes pretending to be S/390).
> >
>
> Is a Hercules node good enough?
It will do the job, yes. For this purpose it's a zBox or S/390
(configuration choice).
You'd have to be pretty keen on the S/390 instruction set though.
Earlier, I posted a little Perl and showed how long it took an a real
Athlon.
Here's the time for the same thing on my Herculean zBox:
skink:~# time /usr/local/bin/bm.perl
real 257m49.513s
user 61m38.330s
sys 194m51.510s
skink:~#
>
> * CPU: what is the effective CPU speed of such a node on a
> not-too-expensive computer?
>
> * Netork: The "speed" (both bandwidth and latency) between a linux
> instance on the PC running Hercules and the linux instance on the
> server
Here's a very rough measure:
skink:~# ping -c4 192.168.1.101
PING 192.168.1.101 (192.168.1.101): 56 data bytes
64 bytes from 192.168.1.101: icmp_seq=0 ttl=255 time=1.7 ms
64 bytes from 192.168.1.101: icmp_seq=1 ttl=255 time=1.4 ms
64 bytes from 192.168.1.101: icmp_seq=2 ttl=255 time=1.4 ms
64 bytes from 192.168.1.101: icmp_seq=3 ttl=255 time=1.4 ms
--- 192.168.1.101 ping statistics ---
4 packets transmitted, 4 packets received, 0% packet loss
round-trip min/avg/max = 1.4/1.4/1.7 ms
skink:~# ifconfig ctc0
ctc0 Link encap:Serial Line IP
inet addr:192.168.1.120 P-t-P:192.168.1.101
Mask:255.255.255.255
UP POINTOPOINT RUNNING NOARP MTU:32760 Metric:1
RX packets:772 errors:0 dropped:0 overruns:0 frame:0
TX packets:659 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:100
RX bytes:60145 (58.7 KiB) TX bytes:66495 (64.9 KiB)
skink:~#
>
> Is it worth the effort of porting mosix to linux/s390 and develping a
> good scheduler?
Not from my POV. If I want to do real computing on my budget, there's no
competition for a cheap PC.
>
> --
> Tzafrir Cohen +---------------------------+
> http://www.technion.ac.il/~tzafrir/ |vim is a mutt's best friend|
> mailto:[EMAIL PROTECTED] +---------------------------+
>
--
Cheers
John.
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