How to measure CPU utilization
Applies to
- ONTAP 9
Answer
As part of a holistic view of the system, use the command line to view CPU utilization in real-time:
Note: The CPU domains are listed in the article CPU as a compute resource and the CPU domains explained in ONTAP 9
Verify the CPU utilization with the following commands :
- Using sysstat -M 1
netapp::> set diag
Warning: These diagnostic commands are for use by NetApp personnel only.
Do you want to continue? {y|n}: y
netapp::*> node run -node netapp-01 sysstat -M 1
ANY1+ ANY2+ ANY3+ ANY4+ ANY5+ ANY6+ ANY7+ ANY8+ ANY9+ ANY10+ ANY11+ ANY12+ ANY13+ ANY14+ ANY15+ ANY16+ AVG
100% 100% 100% 99% 98% 96% 94% 91% 86% 81% 76% 70% 64% 57% 48% 37% 81%
CPU0 CPU1 CPU2 CPU3 CPU4 CPU5 CPU6 CPU7 CPU8 CPU9 CPU10 CPU11 CPU12 CPU13 CPU14 CPU15
78% 76% 77% 83% 82% 83% 82% 82% 82% 82% 83% 84% 83% 82% 83% 82%
Nwk_Excl Nwk_Lg Nwk_Exmpt Protocol Cluster Storage Raid Raid_Ex Target Kahuna WAFL_Ex(Kahu)
3% 2% 450% 0% 0% 49% 2% 136% 0% 4% 511%( 94%)
WAFL_XClean SM_Exempt Cifs Exempt SSAN_Ex Intr Host Ops/s CP
0% 0% 0% 112% 0% 28% 8% 47111 0%
In the above example, Average CPU Utilization is 81% across the 16 cores.
Busiest domains:
- WAFL exempt at 511%
- Networking exempt at 450%
- RAID exempt at 136%, and exempt at 112%.
- WAFL was active 98% of the sample interval, with 4% spent in serial processing and 94% in parallel processing.
- WAFL serial processing being quite low, it is likely that more work could be completed by parallelized WAFL
- Being 98% active within the sample interval is not a concern without other contributing performance indicators.
- Overall CPU resources get scarce, increasing the likelihood of work queuing for CPU, potentially impacting client latency.
- Using sysstat - x 1
cluster1::> set diag
Warning: These diagnostic commands are for use by NetApp personnel only.
Do you want to continue? {y|n}: y
cluster1::*> node run -node cluster1-01 sysstat -x 1
CPU NFS CIFS HTTP Total Net kB/s Disk kB/s Tape kB/s Cache Cache CP
in out read write read write age hit time
2% 0 0 0 24 7 7 12 0 0 0 >60 100% 0%
2% 0 0 0 5 11 4 0 24 0 0 >60 100% 0%
4% 0 0 0 0 9 9 20 1274 0 0 >60 100% 1%
4% 0 0 0 3 7 8 12 36 0 0 >60 - 0%
1% 0 0 0 1 4 5 0 0 0 0 >60 100% 0%
2% 0 0 0 20 6 5 0 0 0 0 >60 - 0%
5% 0 0 0 8 5 6 12 24 0 0 >60 - 0%
1% 0 0 0 0 12 13 12 0 0 0 >60 - 0%
2% 0 0 0 0 3 4 0 36 0 0 >60 - 0%
In the above example, CPU Utilization can be viewed from the first column which is 2%.