VM2000 V12.0 (en)

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This example explains the various outputs for CPU management in the various VM2000 information commands on SU /390.
Asynchronous messages are marked with %.

An example relating specifically to the management of the CPU pool is provided in section "Example of managing CPU pools".

/show-vm-resources information=*cpu VM-ID        CPU-POOL  GR-CPU-Q  CPU-Q/ EFF-Q  MAX-U/ EFF-U  PROC
1 MONITOR   *STDPOOL            20.00/ 10.00 100.00/ 25.00  1(+1)
2 SYSTEM2   *STDPOOL    80.00   70.00/ 28.00 100.00/ 40.00  2(+1) ————  (1)
3 SYSTEM3   *STDPOOL    80.00   30.00/ 12.00  20.00/ 20.00  1(+1) 4 SYSTEM4   EXCLPOOL             1.00/ 50.00 100.00/ 50.00  2(+1) ————  (2)
—————————————————————————————————————————————————————————— (3)
VM-ID        SCHED ACT-I  VIRT CPUS 1 MONITOR    DC    NO    00(RUN),01(SLEEP) ———————————————————————————  (4)
2 SYSTEM2 - NO    00(INIT),01(INIT),02(OFF)
3 SYSTEM3 - NO    00(INIT),01(OFF)
4 SYSTEM4    DC   AT-DC  00(RUN),01(RUN),02(OFF) —————————————————————  (5)
CPU-ATTR     CPU-POOL     REAL CPUS NORMAL       *STDPOOL     00(ATT),01(ATT) —————————————————————————————  (6)
EXCLPOOL     02(ATT),03(ATT) EXTRA                     NONE
SPARE 04(DET)
/show-vm-group vm-group-name=*all,information=*all ————————————————————  (7)
VM-GROUP CPU-POOL  CPU-Q   MAX-U EXTGROUP *STDPOOL  80.00   40.00
VM-GROUP CPU-POOL VM-ID       CPU-Q / EFF-Q   MAX-U / EFF-U
EXTGROUP *STDPOOL  2 SYSTEM2  70.00 / 28.00  100.00 / 40.00 ———————————  (8)
/start-vm ipl-unit=fc1a,vm-id=system2,information-byte=*dialog ————————  (9)
% VMS2023 CPU 00 OF VIRTUAL MACHINE (2,SYSTEM2) STARTED
/show-vm-resources information=*cpu VM-ID        CPU-POOL  GR-CPU-Q  CPU-Q/ EFF-Q  MAX-U/ EFF-U  PROC
1 MONITOR   *STDPOOL            20.00/ 10.00 100.00/ 25.00  1(+1)
2 SYSTEM2   *STDPOOL    80.00   70.00/ 28.00 100.00/ 40.00  2(+1)
3 SYSTEM3   *STDPOOL    80.00   30.00/ 12.00  20.00/ 20.00  1(+1)
4 SYSTEM4   EXCLPOOL             1.00/ 50.00 100.00/ 50.00  2(+1)
VM-ID        SCHED ACT-I  VIRT CPUS
1 MONITOR    DC    NO    00(RUN),01(SLEEP)
2 SYSTEM2    DC    NO    00(RUN),01(STOP),02(OFF) ———————————————————— (10)
3 SYSTEM3 - NO    00(INIT),01(OFF) 4 SYSTEM4    DC   AT-DC  00(RUN),01(RUN),02(OFF)
CPU-ATTR     CPU-POOL     REAL CPUS
NORMAL       *STDPOOL     00(ATT),01(ATT)
EXCLPOOL     02(ATT),03(ATT)
EXTRA                     NONE
SPARE                     04(DET)
/show-vm-status information=*all,period=*recent(seconds=60) ——————————— (11)
/SHOW-VM-STATUS DATA OUTPUT: (PERIOD=    61.844 SEC) CPU TIMER INFORMATION FOR REAL CPU(S) ————————————————————————————————— (12)
CPU-POOL  REAL      HPV-ACTIVE         HPV-IDLE   ALL-VMS-ACTIVE            CPU       TIME/    %       TIME/    %       TIME/    %
*STDPOOL           0.017/ 0.01    123.625/99.95      0.046/ 0.04
            00      0.016/ 0.03     61.784/99.90      0.044/ 0.07
01      0.001/ 0.00     61.841/  100      0.002/ 0.00
EXCLPOOL           0.014/ 0.01      0.000/ 0.00    123.674/99.99
            02      0.007/ 0.01      0.000/ 0.00     61.837/99.99
03      0.007/ 0.01      0.000/ 0.00     61.837/99.99
CPU TIMER INFORMATION FOR VM(S) ——————————————————————————————————————— (13) CPU-POOL   VM-GROUP   VIRT   CPU-Q   CUR-Q   CUR-U        VM - ACTIVE   VM-ID      CPU                                 TIME/     % *STDPOOL(P)                50.00   50.00       0.043/ 0.01 1 MONITOR        20.00   25.00   25.00       0.041/ 0.02   00                                0.041/ 0.01   EXTGROUP(G)       80.00   25.00   25.00       0.002/ 0.00 2 SYSTEM2        70.00   25.00   25.00       0.002/ 0.00   00                                0.002/ 0.00 EXCLPOOL(P)                50.00   50.00     123.653/ 49.98 4 SYSTEM4         1.00   50.00   50.00     123.653/ 49.99   00                               61.777/ 24.97   01                               61.876/ 25.01 CPU COUNTER INFORMATION FOR REAL CPU(S) ——————————————————————————————— (14) CPU-POOL    REAL    I-O INT. INTERCEPT.   EMULATION     SCHEDULE CPU    COUNT/ %   COUNT/ %   COUNT/ %    COUNT/ % *STDPOOL     00      281/100    1153/ 47       4/100     1153/ 47   01        0/ 0      61/ 2       0/ 0       61/ 2 EXCLPOOL     02        0/ 0     625/ 25       0/ 0      625/ 25   03        0/ 0     624/ 25       0/ 0      624/ 25 CPU COUNTER INFORMATION FOR VM(S) CPU-POOL    VIRT    I-O INT. INTERCEPT.   EMULATION     SCHEDULE VM-ID       CPU    COUNT/ %   COUNT/ %   COUNT/ %    COUNT/ % *STDPOOL   1 MONITOR   00      281/100    1153/ 47       4/100     1153/ 47   2 SYSTEM2   00        0/ 0      61/ 2       0/ 0       61/ 2 EXCLPOOL   4 SYSTEM4   00        0/ 0     624/ 25       0/ 0      624/ 25   01        0/ 0     625/ 25       0/ 0      625/ 25 SCHEDULE INFORMATION FOR REAL CPU(S) —————————————————————————————————— (15) CPU-POOL    REAL      <-- TIME SLICE --> NON-AFFIN SCHED CPU        AVG %RUNOUT %SHORT    %IDLE %LOAD *STDPOOL     00        0.03      0     92 DEDICATED SCHED   01        0.03      0    100 DEDICATED SCHED EXCLPOOL     02       VM-ACTIVE-IDLE       DEDICATED SCHED   03       VM-ACTIVE-IDLE       DEDICATED SCHED SCHEDULE INFORMATION FOR VM(S) CPU-POOL    VIRT <--    TIME SLICE    --> NON-AFFIN SCHED %WAIT VM-ID       CPU DEF   AVG %RUNOUT %SHORT    %IDLE %LOAD     TIME *STDPOOL   1 MONITOR   00 8.00 0.03      0     92 DEDICATED SCHED    --   2 SYSTEM2   00 8.00 0.02      0    100 DEDICATED SCHED    -- EXCLPOOL   4 SYSTEM4   00 99.00 VM-ACTIVE-IDLE       DEDICATED SCHED    --   01       VM-ACTIVE-IDLE       DEDICATED SCHED    -- % VMS2023 CPU 01 OF VIRTUAL MACHINE (2,SYSTEM2) STARTED —————————————— (16) % VMS2023 CPU 02 OF VIRTUAL MACHINE (2,SYSTEM2) STARTED —————————————— (17) % VMS2037 NON-INTERRUPTIBLE WAIT STATE FOR VIRTUAL MACHINE (2,SYSTEM2), CODE 80FFFFFF, CPU 02 % VMS2011 CPU 02 OF VIRTUAL MACHINE (2,SYSTEM2) STOPPED % VMS2050 GUEST SYSTEM ON VM (2,SYSTEM2) READY /show-vm-status information=*timer,period=*recent(seconds=180) ———————— (18)
/SHOW-VM-STATUS DATA OUTPUT: (PERIOD=   184.745 SEC) CPU TIMER INFORMATION FOR REAL CPU(S)
CPU-POOL  REAL      HPV-ACTIVE         HPV-IDLE   ALL-VMS-ACTIVE
           CPU       TIME/    %       TIME/    %       TIME/    %
*STDPOOL           2.004/ 0.54    356.243/96.41     11.243/ 3.04
00      1.113/ 0.60    177.743/96.21      5.889/ 3.19
            01      0.891/ 0.48    178.500/96.62      5.354/ 2.90
EXCLPOOL           0.044/ 0.01      0.000/ 0.00    369.446/99.99
02      0.022/ 0.01      0.000/ 0.00    184.723/99.99
            03      0.022/ 0.01      0.000/ 0.00    184.723/99.99
CPU TIMER INFORMATION FOR VM(S)
CPU-POOL
  VM-GROUP   VIRT   CPU-Q   CUR-Q   CUR-U        VM - ACTIVE
VM-ID      CPU                                 TIME/     %
*STDPOOL(P)                50.00   50.00      11.241/  1.52
#  1 MONITOR        20.00   10.00   25.00       0.161/  0.02 —————————— (19)
00                                0.161/  0.02
# EXTGROUP(G)       80.00   40.00   40.00      11.080/  1.50
#  2 SYSTEM2        70.00   40.00   40.00      11.080/  1.50 —————————— (20)               00                                9.889/  1.33
*             01                                1.191/  0.16
*             02                                0.000/  0.00
EXCLPOOL(P)                50.00   50.00     369.377/ 49.98
4 SYSTEM4         1.00   50.00   50.00     369.377/ 49.98
              00                              184.639/ 24.98
              01 184.738/ 24.99
/show-vm-resources information=*cpu VM-ID        CPU-POOL  GR-CPU-Q  CPU-Q/ EFF-Q  MAX-U/ EFF-U  PROC
1 MONITOR   *STDPOOL            20.00/ 10.00 100.00/ 25.00  1(+1)
2 SYSTEM2   *STDPOOL    80.00   70.00/ 28.00 100.00/ 40.00  2(+1)
3 SYSTEM3   *STDPOOL    80.00   30.00/ 12.00  20.00/ 20.00  1(+1)
4 SYSTEM4   EXCLPOOL             1.00/ 50.00 100.00/ 50.00  2(+1)
VM-ID        SCHED ACT-I  VIRT CPUS
1 MONITOR    TS    NO    00(RUN),01(SLEEP)
2 SYSTEM2    TS    NO    00(RUN),01(RUN),02(OFF) ————————————————————— (21)
3 SYSTEM3      NO    00(INIT),01(OFF) 4 SYSTEM4    DC   AT-DC  00(RUN),01(RUN),02(OFF)
CPU-ATTR     CPU-POOL      REAL CPUS
NORMAL       *STDPOOL      00(ATT),01(ATT)
EXCLPOOL      02(ATT),03(ATT)
EXTRA                      NONE
SPARE                      04(DET)
/assign-vm-group-to-cpu-pool vm-group-name=extgroup,to-cpu-pool=exclpool,                  cpu-quota=1,attached-vm-cpus=*check-number ——————————— (22)
VMS4627 CPU POOL ASSIGNMENT OF VM GROUP 'EXTGROUP' CHANGED FROM         CPU POOL '*STDPOOL' TO CPU POOL 'EXCLPOOL'
/show-vm-resources information=*cpu VM-ID        CPU-POOL  GR-CPU-Q  CPU-Q/ EFF-Q  MAX-U/ EFF-U  PROC
1 MONITOR   *STDPOOL            20.00/ 25.00 100.00/ 25.00  1(+1) ———— (23)
2 SYSTEM2   EXCLPOOL     1.00   70.00/ 17.50 100.00/ 40.00  2(+1)
3 SYSTEM3   EXCLPOOL     1.00   30.00/  7.50  20.00/ 20.00  1(+1)
4 SYSTEM4   EXCLPOOL             1.00/ 25.00 100.00/ 50.00  2(+1)
... (Ausgabe gekürzt)
/show-vm-group inf=*all ——————————————————————————————————————————————— (24)
VM-GROUP CPU-POOL  CPU-Q   MAX-U EXTGROUP EXCLPOOL   1.00   40.00
VM-GROUP CPU-POOL VM-ID       CPU-Q / EFF-Q   MAX-U / EFF-U
EXTGROUP EXCLPOOL  2 SYSTEM2  70.00 / 17.50  100.00 / 40.00
3 SYSTEM3  30.00 /  7.50   20.00 / 20.00
/show-vm-status information=*timer,period=*recent(seconds=300) /SHOW-VM-STATUS DATA OUTPUT: (PERIOD=   307.707 SEC)
CPU TIMER INFORMATION FOR REAL CPU(S)
CPU-POOL  REAL      HPV-ACTIVE         HPV-IDLE   ALL-VMS-ACTIVE
           CPU       TIME/    %       TIME/    %       TIME/    %
**STDPOOL           2.342/ 0.38    598.897/97.32     14.175/ 2.30
            00      1.277/ 0.42    299.216/97.24      7.214/ 2.34
            01      1.065/ 0.35    299.681/97.39      6.961/ 2.26
*EXCLPOOL           0.179/ 0.03    140.206/22.78    475.029/77.19
            02      0.088/ 0.03     70.114/22.79    237.505/77.19
            03      0.091/ 0.03     70.092/22.78    237.524/77.19
CPU TIMER INFORMATION FOR VM(S) CPU-POOL
  VM-GROUP   VIRT   CPU-Q   CUR-Q   CUR-U        VM - ACTIVE
VM-ID      CPU                                 TIME/     %
**STDPOOL(P)                50.00   50.00       0.292/  0.02
#  1 MONITOR        20.00   25.00   25.00       0.292/  0.02
00                                0.292/  0.02
*EXCLPOOL(P)                50.00   50.00     488.993/ 39.72
#  4 SYSTEM4         1.00   25.00   50.00     473.893/ 38.50
00                              236.942/ 19.25
              01                              236.951/ 19.25
# EXTGROUP(G)        1.00   25.00   40.00      15.100/  1.23
#  2 SYSTEM2        70.00   25.00   40.00      15.100/  1.23
              00                               11.799/  0.95
*             01                                3.301/  0.26
*   02 0.000/ 0.00

--------------------------------------------------------------------------------------------------------------

(1)	Both a monitor VM with the CPU quota 20 and a VM group `EXTGROUP` with the CPU quota 80 (column `GR-CPU-Q`) have been created for this example. In other words the monitor VM and the VM group `EXTGROUP` are to share the CPU capacity of the standard CPU pool in a ratio of 20:80. The member CPU quota for the VMs `SYSTEM2` and `SYSTEM3` of the VM group `EXTGROUP` is shown in the output column `CPU-Q`. See also `/SHOW-VM-GROUP` (7).
(2)	The VM `SYSTEM4` is assigned to the CPU pool `EXCLPOOL`.
(3)	The displayed planned values effective CPU quota (EFF-Q) and effective maximum CPU utilization (EFF-U) under idealized conditions are calculated using the formulae and constraints in section "Planning distribution of the CPU capacity to the VMs": CPU capacity of `STDPOOL` and `EXCLPOOL`: 50% each (two of four real CPUs each, see (6)) For the VMs and VM groups in the standard CPU pool: Monitor VM: `EFF-Q = 2050/100 = 10%` according to the formula (F1a) `EFF-U = 1100/4 = 25%` according to the constraint (N3) VM group `EXTGROUP`: `EFF-Q = 8050/100 = 40%` acc. to the formula (F1a) `EFF-U = 40%` by means of command `SYSTEM2`: `EFF-Q = 7040/100 = 28%` according to the formula (F1b) `EFF-U = 40%` according to the constraint (N1b) `SYSTEM3`: `EFF-Q = 3040/100 = 12%` according to the formula (F1b) `EFF-U = 20%` according to the constraint (N1a) For the VM in the CPU pool `EXCLPOOL`: `SYSTEM4`: `EFF-Q = 150/1 = 50%` according to the formula (F1) `EFF-U = 2100/4 = 50%` according to the constraint (N2) or (N3)
(4)	In the standard CPU pool the monitor VM is using the scheduling procedure with fixed CPU assignment as only one virtual CPU is running but two real attached CPUs are available (see (6)). The virtual spare CPU `01` is operable (SLEEP status) so that it can immediately take over if the only virtual CPU fails.The VMs `SYSTEM2` and `SYSTEM3` have not yet been started.
(5)	In the CPU pool `EXCLPOOL,` the (only) VM `SYSTEM4` is using the scheduling procedure with fixed CPU assignment with two virtual CPUs on two attached real CPUs (see (6)). The CPU quota is not relevant here; the VM uses the two available CPUs exclusively. The VM2000 administrator has set the attribute `VM-ACTIVE-IDLE=*AT-DEDICATED-CPUS` for this VM. This means that the VM retains control over a real CPU even if the virtual CPU which runs on it is inactive.
(6)	Two attached real normal CPUs (state ATT) each are contained in the standard CPU pool and in the CPU pool `EXCLPOOL`. The CPU capacity of `*STDPOOL` and `EXCLPOOL` is 50% each (2 of 4 real normal CPUs of the Server Unit, according to the formula in section "Planning distribution of the CPU capacity to the VMs"). The detached extra and spare CPUs (DET status) are not relevant for this example.
(7)	For this example a VM group `EXTGROUP` has been created with a planned CPU quota of 80% and a planned maximum CPU utilization of 40% of the Server Unit’s CPU capacity (in this example this corresponds to 80% of the CPU capacity of the standard CPU pool).
(8)	The VM group `EXTGROUP` contains two VMs: `SYSTEM2` with a member CPU quota 70 and unrestricted CPU utilization `SYSTEM3` with a member CPU quota 30 and maximum CPU utilization of 20. In other words `SYSTEM2` and `SYSTEM3` should share the CPU capacity intended for the VM group in a ratio of 70:30.
(9)	The VM2000 administrator starts the guest system on the VM `SYSTEM2`.
(10)	`SYSTEM2` has been set up as a biprocessor system and initially starts up on the virtual CPU `00` (IPL-CPU, state RUN). The virtual CPU `01` is still in SVP stop (state STOP). Furthermore, VM2000 has also assigned the virtual spare CPU `02` to the VM. It is not operable (state OFF) as the startup phase is running and later two attached virtual normal CPUs will be available for this VM. Scheduling continues with fixed CPU assignment. Two virtual CPUs are now running on two real CPUs in the standard CPU pool.
(11)	To compare the planned values for distributing the CPU capacity to the VMs with the current measured values, the VM2000 administrator outputs the data collection of the last 60 seconds for all VMs.
(12)	Output of the CPU-specific information block for `INFORMATION=TIMER`: There is little load on the CPUs of the standard CPU pool The CPUs of the CPU pool `EXCLPOOL` always remain under the control of the VM owing to the attribute `VM-ACTIVE-IDLE=AT-DEDICATED-CPUS`
(13)	Output of the VM-specific information block for `INFORMATION=*TIMER`: The `CUR-Q` and `CUR-U` columns display the calculated current CPU share and the calculated maximum CPU utilization in relation to the active objects in VM2000 operation (see "Planning distribution of the CPU capacity to the VMs"). These differ from the planned values under idealized conditions (cf. (3)) as only 4 of 6 normal CPUs and only 3 of 4 VMs are active. Each virtual CPU thus runs on a real CPU of the Server Unit. Data for the VM `SYSTEM3` is not displayed as no virtual CPU is active in this VM.
(14)	Output of the information blocks for `INFORMATION=*COUNTER`
(15)	Output of the information blocks for `INFORMATION=*SCHEDULE`
(16)	The second virtual CPU `01` of the guest system on the VM `SYSTEM2` is attached.
(17)	The virtual spare CPU `02` is briefly started and then stopped again.
(18)	The VM2000 administrator checks the resultant changes to the time values.
(19)	The values `CUR-Q` and `CUR-U` for the monitor VM are now the same as the planned values `EFF-Q` and `EFF-U` as `SYSTEM2` is active with two virtual normal CPUs. `#` indicates the changes to the current CPU share (`CUR-Q`) for the VMs `MONITOR` and `SYSTEM2`, and for the VM group `EXTGROUP`.
(20)	`SYSTEM2`, as the only active VM of the VM group `EXTGROUP`, is assigned all the VM group’s share of the Server Unit’s CPU capacity while `SYSTEM3` is not active. `*` indicates rows which can contain falsified monitored data for `ACTIVE` times (the virtual CPUs 01 and 02 of the VM `SYSTEM2` have been attached and detached in the monitoring interval).
(21)	Three virtual CPUs are now running on two real CPUs in the standard CPU pool. Time slicing (`TS`) is automatically used for scheduling.
(22)	The VM2000 administrator assigns the VM group `EXTGROUP` to the CPU pool `EXCLPOOL`. 1 is selected as the new CPU quota of the VM group, i.e. the VM group and the VM `SYSTEM4` are to share the CPU capacity of the CPU pool `EXCLPOOL`. The command is executed when the number of attached virtual CPUs of every VM in the VM group is less than or equal to the number of attached real CPUs in the CPU pool to which the VM group is to be assigned.
(23)	The changes for all VMs compared to the output above become visible in this output.
(24)	The changes become visible with these commands, too. See also the explanations for (19) and (20). Note The CPUs in CPU pool `EXCLPOOL` are no longer running in the scheduling procedure with a dedicated CPU assignment. Consequently, attribute `VM-ACTIVE-IDLE=*AT-DEDICATED-CPUS` for VM `SYSTEM4` has no effect any longer.

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Example of CPU management