/root > dtrace -n 'syscall:::entry { @[execname,probefunc] = count() }'
Password:
dtrace: description 'syscall:::entry ' matched 237 probes
[...]
powermt stat1029
sas.e9bc09 read1310
mstragent waitsys 1343
bgscollect
age -<
Date: Fri, 23 Oct 2009 00:06:31 -0700 (PDT)
From: "Matt V."
Subject: Re: [perf-discuss] Kernel usage
To: perf-discuss@opensolaris.org
Thanks for your response.
For moment, we can't patch Oracle version (production environment).
But on another server (which conta
Hi Matt,
why "suppose" who is making the syscalls when you can know ?
run prstat -mL and check it SCL rate
or truss -c the process.
HTH
Paul
>- Begin Included Message -<
Date: Fri, 23 Oct 2009 00:06:31 -0700 (PDT)
From: "Matt V."
Subject: Re: [perf-disc
Thanks for your response.
For moment, we can't patch Oracle version (production environment).
But on another server (which contains containers too), we have the same problem:
> sar 1 100
SunOS 5.10 Generic_137137-09 sun4u10/23/2009
09:00:17%usr%sys%wio %idle
09:00:18 12
On 10/20/09 10:49, Matt V. wrote:
I've tried your script lockutil and now the output:
lockutil -n 44 lockstat_kWP.out
CPU-util Lock Caller
0.191 kstat_chain_lock kstat_hold
0.036 kstat_chain_lock kstat_rele
0.014 mod_lock mod_hold_stub
0.00
I've tried your script lockutil and now the output:
lockutil -n 44 lockstat_kWP.out
CPU-util Lock Caller
0.191 kstat_chain_lock kstat_hold
0.036 kstat_chain_lock kstat_rele
0.014 mod_lock mod_hold_stub
0.006 kpr_mutexhat_page_rel
> Any chance this machine is running many instances of Oracle? I've seen
> very high kstat usage in that scenario.
Yes: ~75 instances in 6 zones).
> Next step would be to add a '-s 20' to the lockstat to get a kernel
> stack for this lock.
The output:
Adaptive mutex spin: 113576 events in 11.110
See here for a script that post-processes lockstat output and quantifies
the overhead from lock spinning:
http://blogs.sun.com/sistare/entry/measuring_lock_spin_utilization
I just ran it (using a guestimate for your CPU count), and the culprits
clearly are the kstat related locks. Something on
Matt V. wrote:
OK, I've tried lockstat; here, the lockstat.out
Adaptive mutex spin: 75935 events in 10.334 seconds (7348 events/sec)
Count indv cuml rcnt nsec Lock Caller
---
2338 3% 3% 0.00
OK, I've tried lockstat; here, the lockstat.out
Adaptive mutex spin: 75935 events in 10.334 seconds (7348 events/sec)
Count indv cuml rcnt nsec Lock Caller
---
2338 3% 3% 0.0016898 0x1999a78
Jim Fiori wrote:
Lock contention Matt. See what locks are hot:
# lockstat -o lockstat.out -D20 sleep 10
Matt V. wrote:
OK, I tried the DTrace script "hotkernel" et the result is:
[...]
ce`ce_intr 1245 0.4%
unix`page_lookup_nowait
Lock contention Matt. See what locks are hot:
# lockstat -o lockstat.out -D20 sleep 10
Matt V. wrote:
OK, I tried the DTrace script "hotkernel" et the result is:
[...]
ce`ce_intr 1245 0.4%
unix`page_lookup_nowait 1
OK, I tried the DTrace script "hotkernel" et the result is:
[...]
ce`ce_intr 1245 0.4%
unix`page_lookup_nowait 1330 0.5%
genunix`rm_assize1448 0.5%
genunix`segmap_getmapflt
On Mon, Oct 19, 2009 at 7:23 AM, Chad Mynhier wrote:
> On Mon, Oct 19, 2009 at 6:47 AM, Matt V. wrote:
>> Hi,
>>
>> On a Solaris 10 server, with 'top' command, we have:
>> CPU states: 28.9% idle, 14.2% user, 56.9% kernel, 0.0% iowait, 0.0% swap
>>
>> How to know where is spent kernel usage plea
On Mon, Oct 19, 2009 at 6:47 AM, Matt V. wrote:
> Hi,
>
> On a Solaris 10 server, with 'top' command, we have:
> CPU states: 28.9% idle, 14.2% user, 56.9% kernel, 0.0% iowait, 0.0% swap
>
> How to know where is spent kernel usage please ?
>
> Thank you in advance.
> Matt
There are a number of t
Matt V. stated:
< Hi,
<
< On a Solaris 10 server, with 'top' command, we have:
< CPU states: 28.9% idle, 14.2% user, 56.9% kernel, 0.0% iowait, 0.0% swap
<
< How to know where is spent kernel usage please ?
lockstat can lock, so too can the hotkernel script from the DTrace Toolkit.
If you
Hi,
On a Solaris 10 server, with 'top' command, we have:
CPU states: 28.9% idle, 14.2% user, 56.9% kernel, 0.0% iowait, 0.0% swap
How to know where is spent kernel usage please ?
Thank you in advance.
Matt
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