Hi,
I have an Oracle 8.1.7.4 64bit running in a Solaris 9 branded zone on-top of
Solaris 10.
When I put a tablespace in a hotbackup mode it takes long time - usually more
than 4s for each tablespace. Looks like ora_ckpt process is consuming 100% of
cpu (in usr) while a tablespace is being put in the hotbackup mode.
It looks like there might be an issue with semop() interposition in S9 branded
zone.
I can't easily test it now but IIRC when running Oracle in a global zone there
was no such issue.
More details below.
First, lets check a PID of ora_ckpt
# ps -ef | grep 20326
oracle 20326 1 0 15:37:26 ? 15:52 ora_ckpt_I321
Now lets put a TEMP tablespace in a backup mode while running a dtrace script
as well:
SQL> alter tablespace TEMP begin backup;
Tablespace altered.
Elapsed: 00:00:04.65
# dtrace -n sched:::on-cpu'/pid==20326 && tid==1/{self->t=timestamp;}' -n
sched:::off-cpu'/self->t/{...@u[ustack()]=sum(timestamp-self->t);@c[ustack()]=count();self->t=0;}'
-n tick-10s'{printa(@u);printa(@c)}'
dtrace: description 'sched:::on-cpu' matched 1 probe
dtrace: description 'sched:::off-cpu' matched 2 probes
dtrace: description 'tick-10s' matched 1 probe
^C
`_s9brand_systemcall+0x30
`s9_semsys+0x16c
`s9_handler+0x84
oracle`sslssalck+0x514
libc.so.1`semop+0x18
oracle`sskgpwwait+0x13c
oracle`ksliwat+0x44c
oracle`kslwaitns+0x20
oracle`kskthbwt+0x174
oracle`kslwait+0x50
oracle`ksarcv+0x1bc
oracle`ksbabs+0x344
oracle`ksbrdp+0x2ec
oracle`opirip+0x31c
oracle`opidrv+0x6a0
oracle`sou2o+0x10
oracle`main+0x128
oracle`_start+0x17c
oracle`_start+0x18
3852868427
oracle`_s9brand_systemcall+0x30
oracle`s9_semsys+0x16c
oracle`s9_handler+0x84
oracle`sslssalck+0x514
libc.so.1`semop+0x18
oracle`sskgpwwait+0x13c
oracle`ksliwat+0x44c
oracle`kslwaitns+0x20
oracle`kskthbwt+0x174
oracle`kslwait+0x50
oracle`ksarcv+0x1bc
oracle`ksbabs+0x344
oracle`ksbrdp+0x2ec
oracle`opirip+0x31c
oracle`opidrv+0x6a0
oracle`sou2o+0x10
oracle`main+0x128
oracle`_start+0x17c
oracle`_start+0x18
12
So the same ustack() consumed almost 4s of a CPU time out of 4.6s of a total
time of the operation.
Has anyone been hit by it?
Also the 2nd stack looks strange (top 5 lines)...
--
Robert Milkowski
http://milek.blogspot.com
--
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