Subject: Re: [vserver] vserver scalability
From: Eugen Leitl <eugen@leitl.org>
Date: Mon, 7 Jun 2010 15:01:01 +0200

On Mon, Jun 07, 2010 at 11:29:56AM +0200, Juraj Pisarcik wrote:
> My highest number on 2x dualcore Opteron with 16GB RAM was approx. 50 servers.
> It was mostly webservers (Apache Tomcat, HTTPD, ...)  and databases
> and some other stuff(Samba, ...). Problem was SHM, because I'm still
> running 32-bit kernel on this server. DB servers needs a lot of SHM
> and on 32-bit is upper limit max. 4GB SHM.

I'm running 253 uloaded vservers (nginx+postfix+ssh) on a 4 GByte
dual-core Atom server.

eryllium:~# vserver-stat
CTX   PROC    VSZ    RSS  userTIME   sysTIME    UPTIME NAME
2       10 328.7M  14.2M  14m31s17  10m37s84   8d04h45 v2
3        9 357.1M  14.1M   9m03s04   6m23s94   8d04h45 v3
4        9 307.6M  14.2M   8m12s62   5m59s13   8d04h45 v4
5        9 307.2M  14.2M   8m04s78   5m59s68   8d04h44 v5
6        9 378.6M  14.2M  10m30s55   7m56s51   8d04h44 v6
7        9 357.1M  14.2M  10m47s92   7m58s68   8d04h44 v7
...

252      9 357.1M  12.4M   4m40s68   3m37s14   8d04h45 v252
253      9 357.1M  12.4M   4m20s41   3m19s12   8d04h45 v253
254      9 356.6M  12.4M   5m43s40   3m47s88   8d04h45 v254

beryllium:~# w
 15:05:14 up 8 days,  4:48,  1 user,  load average: 0.13, 0.14, 0.45
USER     TTY      FROM              LOGIN@   IDLE   JCPU   PCPU WHAT
root     pts/0    helium.ativel.co 15:04    0.00s  0.05s  0.02s w

beryllium:~# cat /proc/meminfo 
MemTotal:        4063316 kB
MemFree:          441340 kB
Buffers:          854120 kB
Cached:           319320 kB
SwapCached:        32860 kB
Active:          1192708 kB
Inactive:        1010560 kB
Active(anon):     575204 kB
Inactive(anon):   456456 kB
Active(file):     617504 kB
Inactive(file):   554104 kB
Unevictable:           0 kB
Mlocked:               0 kB
SwapTotal:       3229056 kB
SwapFree:        3082628 kB
Dirty:               216 kB
Writeback:             0 kB
AnonPages:        997936 kB
Mapped:             8792 kB
Slab:            1105764 kB
SReclaimable:     913432 kB
SUnreclaim:       192332 kB
PageTables:       191452 kB
NFS_Unstable:          0 kB
Bounce:                0 kB
WritebackTmp:          0 kB
CommitLimit:     5260712 kB
Committed_AS:    4014436 kB
VmallocTotal:   34359738367 kB
VmallocUsed:      281164 kB
VmallocChunk:   34359454079 kB
HugePages_Total:       0
HugePages_Free:        0
HugePages_Rsvd:        0
HugePages_Surp:        0
Hugepagesize:       2048 kB
DirectMap4k:        3584 kB
DirectMap2M:     4190208 kB

 
> Juraj
> 
> On Thu, Jun 3, 2010 at 7:44 PM, JF Straeten <jfstraeten@scarlet.be> wrote:
> > Hi,
> >
> > On Thu, Jun 03, 2010 at 10:04:33AM -0700, Nirmal Guhan wrote:
> >
> >> Has anyone in this list done a scalability test on vserver ? Am
> >> particularly interested to know how many virtual servers can be
> >> spawned in a single host?
> >
> > I'm aware of this paper, related to OpenVZ :
> >
> > http://www.montanalinux.org/openvz-experiment.html
> >
> > It can only be better under VServer :-)
> >
> > Hih,
> >
> > --
> >
> > JFS.
> >
-- 
Eugen* Leitl <a href="leitlhttp://leitl.org">leitl</a> http://leitl.org
______________________________________________________________
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