I've recently tried to temporarily change zone.cpu-shares of the global
zone on a Sun Fire X4200 M2 running Solaris 10 Update 5. Per default, both
the global and the imap zone have 10 shares:
global% zonecfg -z global info rctl
rctl:
name: zone.cpu-shares
value: (priv=privileged,limit=10,action=none)
global% zonecfg -z imap info rctl
rctl:
name: zone.cpu-shares
value: (priv=privileged,limit=10,action=none)
FSS is the default scheduler:
global% dispadmin -d
FSS (Fair Share)
For a benchmark run, I wanted to temporarily increase the shares of the
global zone. I tried both to increase global zone shares to 100 and
reducing imap zone shares to 1:
global# prctl -i zone -n zone.cpu-shares -r -v 100 global
global# prctl -i zone -n zone.cpu-shares -r -v 1 imap
global# prctl -i zone -n zone.cpu-shares global imap
zone: 0: global
NAME PRIVILEGE VALUE FLAG ACTION RECIPIENT
zone.cpu-shares
privileged 100 - none -
system 65.5K max none -
zone: 4: imap
NAME PRIVILEGE VALUE FLAG ACTION RECIPIENT
zone.cpu-shares
privileged 1 - none -
system 65.5K max none -
Unfortunately, this had no effect, as can be seen with prstat -Z:
PID USERNAME SIZE RSS STATE PRI NICE TIME CPU PROCESS/NLWP
2711 ro 6848K 6392K run 1 0 236:19:41 12% john/1
2710 ro 6848K 6384K cpu2 6 0 236:01:19 12% john/1
2707 ro 6976K 6512K run 1 0 235:53:41 12% john/1
2835 ro 6976K 6524K run 7 0 235:42:22 11% john/1
1981 root 4556K 4076K sleep 59 0 1:27:03 1.5% prstat/1
6539 root 2504K 2008K cpu3 59 0 0:00:00 0.0% prstat/1
6293 vmail 20M 5256K sleep 59 0 0:00:04 0.0% imap/1
429 root 5600K 3052K sleep 59 0 0:12:12 0.0% automountd/3
1356 100 16M 15M sleep 58 0 0:28:48 0.0% imap-login/1
1358 100 12M 11M sleep 49 0 0:12:59 0.0% imap-login/1
6459 vmail 42M 8220K sleep 57 0 0:00:02 0.0% imap/1
6201 vmail 3852K 3020K sleep 59 0 0:00:00 0.0% imap/1
6921 noaccess 323M 238M sleep 59 0 0:12:31 0.0% java/25
6284 vmail 3240K 2400K sleep 55 0 0:00:00 0.0% imap/1
1357 100 10M 9784K sleep 59 0 0:12:10 0.0% imap-login/1
ZONEID NPROC SWAP RSS MEMORY TIME CPU ZONE
0 64 784M 909M 11% 953:58:18 49% global
4 387 541M 349M 4.3% 1:11:04 0.1% imap
Total: 451 processes, 731 lwps, load averages: 4.70, 4.70, 4.77
There are four single-threaded processes in the global zone, each of which
could consume a whole core (the box has 4 dual-core cpus), but still the
global zone remains at ca. 50% cpu consumption. Starting additional
processes has no effect either, even if they run as root. I seem not to be
able to exceed the old zone.cpu-shares value of 50.
In addition to those zone.cpu-shares, per-project cpu shares are in effect
for user ro, but not for root:
global# getent project user.ro
user.ro:2110::::project.cpu-shares=(privileged,1,none);project.max-lwps=(privileged,256,deny)
global# getent project user.root
user.root:1::::
Nonetheless, inside the global zone, cpu consumption between root and ro is
almost equal (as if root had one share as well).
Is there any way to have the new zone.cpu-shares take effect without
rebooting the machine? Given that this is also the department's IMAP
server, I'd very much like to avoid this.
Rainer
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Rainer Orth, Faculty of Technology, Bielefeld University
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