Re: [hlds_linux] server hardware

[k-mystik]

I totally agree, the OS has no idea 2 of its CPUs are virtual.

If I launch a single-thread process, it will eat up 100% of one logical
CPU (50% of one physical CPU), which is what it is supposed to do.
A multi-threaded process (4 threads for instance) will consume 100% of
both CPU; still ok.

HT is just a way of cheating to be able to "process" 2 threads 50/50 on
the very same CPU.

or maybe I'm totally wrong on this HT thing...


Ian mu wrote:

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[ Picked text/plain from multipart/alternative ]
Your'e missing the point still a bit, with ht you don't have 100% global cpu
to play with in the first place, you only have 50% plus the benefit of ht.
The o.s essentially doesn't realise 2 of the cpu's are virtual and can't be
used to their full extent, it still thinks you have 4 full cpu's. This bears
our roughly with the load figures top right. Personally we try to keep all
of our dual cpu machines under a load of 2 (not one has gone over in the
last week), but there's a fair bit of slack in that and can go higher, just
we prefer not to for performance reasons.

I wouldn't ideally want to see double that (whilst things like webservers
would probably be ok with higher loads as less noticable) on that box, let
alone triple, but depends what kind of performance and contention people are
ok with really.



On 11/15/06, k-mystik <[EMAIL PROTECTED]> wrote:

Right now, 49 people are playing on one of our machines, here's top
output:

top - 22:09:17 up 43 days, 22:02,  1 user,  load average: 1.82, 1.85, 1.73
Tasks:  97 total,   3 running,  94 sleeping,   0 stopped,   0 zombie
Cpu0  : 19.5% us,  1.7% sy,  0.0% ni, 73.5% id,  1.0% wa,  1.3% hi,
3.0% si,  0.0% st
Cpu1  : 23.7% us,  1.7% sy,  0.0% ni, 74.2% id,  0.0% wa,  0.0% hi,
0.3% si,  0.0% st
Cpu2  : 23.3% us,  2.3% sy,  0.0% ni, 74.1% id,  0.0% wa,  0.0% hi,
0.3% si,  0.0% st
Cpu3  : 17.3% us,  1.3% sy,  0.0% ni, 81.0% id,  0.0% wa,  0.0% hi,
0.3% si,  0.0% st
Mem:   2060228k total,  2028756k used,    31472k free,   145668k buffers
Swap:  2031608k total,       88k used,  2031520k free,  1336232k cached

Which is 20.95% global CPU average.
The max players we had at the same time was ~100 and the server had an
average CPU usage of 40% (spiking to 50%)
So, these numbers well reflects our calculations.

--
k-mystik! -- get2play administrator
web: www.get2play.com
irc: #get2play


Marcel wrote:

Marcel wrote:

Hey,

We use Fedora Core 4 on dual Xeon 3.2ghz (2Mb L2) and run without any
problem 14 CS1.6 server (12 players) at stable 250fps.
(yes we recompiled the kernel)

And how many slots are filled max at which cpu usage? That's the only
thing that matters and I don't think all 168 Slots can be filled.

Based on our calculations, all 168 slots can be filled in with still
some CPU spare.
Currently a 10 slots CS1.6 @ 250fps uses up to 18% of one logical CPU

(4

logical CPUs are present due to HT).

Btw: if someone can explain the high context-switch (shown in "vmstat
1") numbers I have (12000+): shoot!

Have you tried that our or are these numbers only calculations?
AFAIK the two HT-logical cpus can't handle the same "usage" as the real
physical cores.

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irc: #get2play



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