onstat -g glo command: Print global multithreading information

Use the onstat -g glo command to display global information about multithreading, information about each virtual processor that is running, and cumulative statistics for each virtual-processor class. This information includes CPU use information about the virtual processors, the total number of sessions, and other multithreading global counters.

Figure 1: Syntax:

Example output

Figure 2: onstat -g glo command output

MT global info:
sessions threads  vps      lngspins time    
0        23       14       0        142     

          sched calls     thread switches yield 0   yield n   yield forever
total:    85240           70451           16956     868       37319    
per sec:  0               0               0         0         0        

Virtual processor summary:
 class       vps       usercpu   syscpu    total   
 cpu         1         92.12     0.59      92.71   
 aio         1         0.05      0.08      0.13    
 lio         1         0.00      0.00      0.00    
 pio         1         0.00      0.00      0.00    
 adm         1         0.00      0.01      0.01    
 soc         4         0.01      0.01      0.02    
 msc         1         0.00      0.00      0.00    
 jvp         1         0.00      0.00      0.00    
 fifo        1         0.00      0.00      0.00    
 nyevp       1         0.00      0.00      0.00    
 yevp        1         0.00      0.00      0.00    
 total       14        92.18     0.69      92.87   

Individual virtual processors:
 vp    pid       class       usercpu   syscpu    total     Thread    Eff  
 1     26328     cpu         92.12     0.59      92.71     122.65    75%
 2     26330     adm         0.00      0.01      0.01      0.00       0%
 3     26331     lio         0.00      0.00      0.00      0.00       0%
 4     26332     pio         0.00      0.00      0.00      0.00       0%
 5     26333     aio         0.05      0.08      0.13      0.28      45%
 6     26334     msc         0.00      0.00      0.00      0.19       0%
 7     26335     fifo        0.00      0.00      0.00      0.00       0%
 8     26336     nyevp       0.00      0.00      0.00      0.00       0%
 9     26337     yevp        0.00      0.00      0.00      0.00       0%
 10    26338     jvp         0.00      0.00      0.00      0.00       0%
 11    26339     soc         0.00      0.00      0.00      NA         NA
 12    26340     soc         0.00      0.00      0.00      NA         NA
 13    26341     soc         0.01      0.01      0.02      NA         NA
 14    26342     soc         0.00      0.00      0.00      NA         NA
                 tot         92.18     0.69      92.87


MT global info:
sessions threads  vps      lngspins
0        28       11       0

          sched calls     thread switches  yield 0   yield n   yield forever
total:    19577737        16256991         3688561   11340793  280099
per sec:  0               0                 0         0         0

Virtual processor summary:
 class       vps       usercpu   syscpu    total
 cpu         1         107.40    8.09      115.49
 aio         6         4.19      94.42     98.61
 lio         1         0.68      3.54      4.22
 pio         1         0.03      0.33      0.36
 adm         1         0.00      0.05      0.05
 msc         1         0.00      0.01      0.01
 total       11        112.30    106.44    218.74

Individual virtual processors:
 vp    pid       class       usercpu   syscpu    total     Thread    Eff
 1     5738      cpu         107.40    8.09      115.49    246.14    46%
 2     5739      adm         0.00      0.05      0.05      0.00       0%
 3     5740      lio         0.68      3.54      4.22      36.44     11%
 4     5741      pio         0.03      0.33      0.36      7.50       4%
 5     5742      aio         2.03      51.92     53.95     358.09    15%

Output description

The following table explains each column in the global information section of the example output.

Table 1. Description of the columns in the virtual processor summary
Column name	Description
sessions	The number of sessions
threads	The total number of threads
vps	The total number of virtual processors
lngspins	The number of times a thread had to spin more than 10,000 times to acquire a latch on a resource
time	The number of seconds over which the statistics were gathered. Statistics start when the server starts or the statistics are reset by running the onstat -z command.
sched calls	The total number of scheduled calls.
thread switches	The total number of switches from one thread to another.
yield	Statistics on thread yields, which occur when a thread can no longer continue its task until some condition occurs

The following table explains each column in the virtual processor summary section of the example output.

Table 2. Description of the columns in the virtual processor summary
Column name	Description
class	The type of virtual processor.
vps	The number of instances of the class of virtual processor.
usercpu	The total user time, in seconds, that the class of virtual processor spent running on the CPU.
syscpu	The total system time, in seconds, the class of virtual processor spent running on the CPU.
total	The total CPU time for the virtual processor class, as the sum of the user time plus the system time.

The following table explains each column in the individual virtual processors section of the example output.

Table 3. Description of the columns for the individual virtual processors
Column name	Description
vp	The virtual processor number. On Windows™, the values are thread IDs.
pid	The Process ID of the oninit process.
class	The type of virtual processor.
usercpu	The total user time, in seconds, that the virtual processor spent running on the CPU.
syscpu	The total system time, in seconds, that the virtual processor spent running on the CPU.
total	The total CPU time for the virtual processor, as the sum of the user time plus the system time.
Thread	The total time the threads ran on the virtual processor.
Eff	Efficiency. The ratio of the total CPU time to the total time the threads ran on the virtual processor.