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HP OpenVMS System Analysis Tools Manual

HP OpenVMS System Analysis Tools Manual


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This excerpt illustrates the condensed form of the display produced in the first example.

#3

SDA> SHOW SPINLOCKS/FULL SCHED
System static spinlock structures 
--------------------------------- 
SCHED                                  Address        810AED00 
Owner CPU ID       00000000            IPL            00000008 
Ownership Depth    00000000            Rank           00000012 
Timeout Interval   002DC6C0            Share Array    00000000 
CPUs Waiting       00000001            Interlock        Free 
 
Spins              00000000.0458E8DC   Busy waits     00252E8D 
Acquires           00000000.01279BE0 
 
Spinlock SPL$C_SCHED was last acquired or released from: 
(Most recently)                 8004AD00 EXE$SWTIMER_FORK_C+00170 
       .                        8004B1D4 EXE$SWTIMER_FORK_C+00644 
       .                        8004AD00 EXE$SWTIMER_FORK_C+00170 
       .                        8004B1D4 EXE$SWTIMER_FORK_C+00644 
       .                        8004AD00 EXE$SWTIMER_FORK_C+00170 
       .                        8004B1D4 EXE$SWTIMER_FORK_C+00644 
       .                        8004AD00 EXE$SWTIMER_FORK_C+00170 
       .                        8004B1D4 EXE$SWTIMER_FORK_C+00644 
       .                        8004AD00 EXE$SWTIMER_FORK_C+00170 
       .                        80136A2C SCH$INTERRUPT+0070C 
       .                        80117580 SCH$IDLE_C+002A0 
       .                        8004B230 EXE$SWTIMER_FORK_C+006A0 
       .                        8004AFC4 EXE$SWTIMER_FORK_C+00434 
       .                        80117360 SCH$IDLE_C+00080 
       .                        8012E5F4 EXE$HIBER_INT_C+00074 
(Least recently)                80132150 EXE$SCHDWK_C+00110 
 
Last release of multiple acquisitions occurred at: 
                                80262A54 EXE$CHECK_VERSION_C+009F4
      

This display shows the detailed information on the SCHED spinlock, including the PC history.


SHOW STACK

Displays the location and contents of the process stacks (of the SDA current process) and the system stack.

Format

SHOW STACK {range|/ALL|[/EXECUTIVE|/INTERRUPT|/KERNEL |/PHYSICAL|/SUMMARY| /SUPERVISOR|/SYSTEM|/USER]} {/LONG|/QUAD (d)}


Parameter

range

Range of memory locations you want to display in stack format. You can express a range using the following syntax:
m:n Range of addresses from m to n
m;n Range of addresses starting at m and continuing for n bytes

Qualifiers

/ALL

Displays the locations and contents of the four process stacks for the SDA current process and the system stack.

/EXECUTIVE

Shows the executive stack for the SDA current process.

/INTERRUPT

Shows the system stack and is retained for compatibility with OpenVMS VAX. The interrupt stack does not exist in OpenVMS Alpha.

/KERNEL

Shows the kernel stack for the SDA current process.

/LONG

Displays longword width stacks. If you do not specify this qualifier, SDA by default displays quadword width stacks.

/PHYSICAL

Treats the start and end addresses in the given range as physical addresses. This qualifier is only relevant when a range is specified. By default, SDA treats range addresses as virtual addresses.

/QUAD

Displays quadword width stacks. This is the default.

/SUMMARY

Displays a list of all known stack ranges and the current stack pointer for each range.

/SUPERVISOR

Shows the supervisor stack for the SDA current process.

/SYSTEM

Shows the system stack.

/USER

Shows the user stack for the SDA current process.

Description

The SHOW STACK command, by default, displays the stack that was in use when the system failed, or, in the analysis of a running system, the current operating stack. For a process that became the SDA current process as the result of a SET PROCESS command, the SHOW STACK command by default shows its current operating stack.

The various qualifiers to the command allow display of any of the four per-process stacks for the SDA current process, as well as the system stack for the SDA current CPU. In addition, any given range can be displayed in stack format.

You can define SDA process and CPU context by using the SET CPU, SHOW CPU, SHOW CRASH, SET PROCESS, and SHOW PROCESS commands as indicated in their command descriptions. A complete discussion of SDA context control appears in Section 2.5.

SDA provides the following information in each stack display:
Section Contents
Identity of stack SDA indicates whether the stack is a process stack (user, supervisor, executive, or kernel) or the system stack.
Stack pointer The stack pointer identifies the top of the stack. The display indicates the stack pointer by the symbol SP =>.
Stack address SDA lists all the addresses that the operating system has allocated to the stack. The stack addresses are listed in a column that increases in increments of 8 bytes (one quadword) unless you specify the /LONG qualifier, in which case addresses are listed in increments of 4 (one longword).
Stack contents SDA lists the contents of the stack in a column to the right of the stack addresses.
Symbols SDA attempts to display the contents of a location symbolically, using a symbol and an offset.

If the stack is being displayed in quadword width and the location cannot be symbolized as a quadword, SDA attempts to symbolize the least significant longword and then the most significant longword. If the address cannot be symbolized, this column is left blank.

Canonical stack When displaying the kernel stack of a noncurrent process in a crash dump, SDA identifies the stack locations used by the scheduler to store the register contents of the process.
Mechanism array
Signal array
Exception frame
When displaying the current stack in a FATALEXCPT, INVEXCEPTN, SSRVEXCEPT, or UNXSIGNAL bugcheck, SDA identifies the stack locations used to store registers and other key data for these structures.

If a stack is empty, the display shows the following:


SP =>  (STACK IS EMPTY) 


Examples


 
 


#1

SDA>  SHOW STACK
Current Operating Stack (SYSTEM):
                       FFFFFFFF.8244BD08  FFFFFFFF.800600FC  SCH$REPORT_EVENT_C+000FC
                       FFFFFFFF.8244BD10  00000000.00000002  
                       FFFFFFFF.8244BD18  00000000.00000005  
                       FFFFFFFF.8244BD20  FFFFFFFF.8060C7C0  
                SP =>  FFFFFFFF.8244BD28  FFFFFFFF.8244BEE8  
                       FFFFFFFF.8244BD30  FFFFFFFF.80018960  EXE$HWCLKINT_C+00260
                       FFFFFFFF.8244BD38  00000000.000001B8  
                       FFFFFFFF.8244BD40  00000000.00000050  
                       FFFFFFFF.8244BD48  00000000.00000210  UCB$N_RSID+00002
                       FFFFFFFF.8244BD50  00000000.00000000  
                       FFFFFFFF.8244BD58  00000000.00000000  
                       FFFFFFFF.8244BD60  FFFFFFFF.804045D0  SCH$GQ_IDLE_CPUS
                       FFFFFFFF.8244BD68  FFFFFFFF.8041A340  EXE$GL_FKWAITFL+00020
                       FFFFFFFF.8244BD70  00000000.00000250  UCB$T_MSGDATA+00034
                       FFFFFFFF.8244BD78  00000000.00000001  
CHF$IS_MCH_ARGS        FFFFFFFF.8244BD80  00000000.0000002B  
CHF$PH_MCH_FRAME       FFFFFFFF.8244BD88  FFFFFFFF.8244BFB0  
CHF$IS_MCH_DEPTH       FFFFFFFF.8244BD90  80000000.FFFFFFFD  G
CHF$PH_MCH_DADDR       FFFFFFFF.8244BD98  00000000.00001600  CTL$C_CLIDATASZ+00060
CHF$PH_MCH_ESF_ADDR    FFFFFFFF.8244BDA0  FFFFFFFF.8244BF40  
CHF$PH_MCH_SIG_ADDR    FFFFFFFF.8244BDA8  FFFFFFFF.8244BEE8  
CHF$IH_MCH_SAVR0       FFFFFFFF.8244BDB0  FFFFFFFF.8041FB00  SMP$RELEASEL+00640
CHF$IH_MCH_SAVR1       FFFFFFFF.8244BDB8  00000000.00000000  
CHF$IH_MCH_SAVR16      FFFFFFFF.8244BDC0  00000000.0000000D  
CHF$IH_MCH_SAVR17      FFFFFFFF.8244BDC8  0000FFF0.00007E04  
CHF$IH_MCH_SAVR18      FFFFFFFF.8244BDD0  00000000.00000000  
CHF$IH_MCH_SAVR19      FFFFFFFF.8244BDD8  00000000.00000001  
CHF$IH_MCH_SAVR20      FFFFFFFF.8244BDE0  00000000.00000000  
CHF$IH_MCH_SAVR21      FFFFFFFF.8244BDE8  FFFFFFFF.805AE4B6  SISR+0006E
CHF$IH_MCH_SAVR22      FFFFFFFF.8244BDF0  00000000.00000001  
CHF$IH_MCH_SAVR23      FFFFFFFF.8244BDF8  00000000.00000010  
CHF$IH_MCH_SAVR24      FFFFFFFF.8244BE00  00000000.00000008  
CHF$IH_MCH_SAVR25      FFFFFFFF.8244BE08  00000000.00000010  
CHF$IH_MCH_SAVR26      FFFFFFFF.8244BE10  00000000.00000001  
CHF$IH_MCH_SAVR27      FFFFFFFF.8244BE18  00000000.00000000  
CHF$IH_MCH_SAVR28      FFFFFFFF.8244BE20  FFFFFFFF.804045D0  SCH$GQ_IDLE_CPUS
                       FFFFFFFF.8244BE28  30000000.00000300  UCB$L_PI_SVA
                       FFFFFFFF.8244BE30  FFFFFFFF.80040F6C  EXE$REFLECT_C+00950
                       FFFFFFFF.8244BE38  18000000.00000300  UCB$L_PI_SVA
                       FFFFFFFF.8244BE40  FFFFFFFF.804267A0  EXE$CONTSIGNAL+00228
                       FFFFFFFF.8244BE48  00000000.7FFD00A8  PIO$GW_IIOIMPA
                       FFFFFFFF.8244BE50  00000003.00000000  
                       FFFFFFFF.8244BE58  FFFFFFFF.8003FC20  EXE$CONNECT_SERVICES_C+00920
                       FFFFFFFF.8244BE60  FFFFFFFF.8041FB00  SMP$RELEASEL+00640
                       FFFFFFFF.8244BE68  00000000.00000000  
                       FFFFFFFF.8244BE70  FFFFFFFF.8042CD50  SCH$WAIT_PROC+00060
                       FFFFFFFF.8244BE78  00000000.0000000D  
                       FFFFFFFF.8244BE80  0000FFF0.00007E04  
                       FFFFFFFF.8244BE88  00000000.00000000  
                       FFFFFFFF.8244BE90  00000000.00000001  
                       FFFFFFFF.8244BE98  00000000.00000000  
                       FFFFFFFF.8244BEA0  FFFFFFFF.805AE4B6  SISR+0006E
                       FFFFFFFF.8244BEA8  00000000.00000001  
                       FFFFFFFF.8244BEB0  00000000.00000010  
                       FFFFFFFF.8244BEB8  00000000.00000008  
                       FFFFFFFF.8244BEC0  00000000.00000010  
                       FFFFFFFF.8244BEC8  00000000.00000001  
                       FFFFFFFF.8244BED0  00000000.00000000  
                       FFFFFFFF.8244BED8  FFFFFFFF.804045D0  SCH$GQ_IDLE_CPUS
                       FFFFFFFF.8244BEE0  00000000.00000001  
CHF$L_SIG_ARGS         FFFFFFFF.8244BEE8  0000000C.00000005  
CHF$L_SIG_ARG1         FFFFFFFF.8244BEF0  FFFFFFFC.00010000  SYS$K_VERSION_08
                       FFFFFFFF.8244BEF8  00000300.FFFFFFFC  UCB$L_PI_SVA
                       FFFFFFFF.8244BF00  00000002.00000001  
                       FFFFFFFF.8244BF08  00000000.0000000C  
                       FFFFFFFF.8244BF10  00000000.00000000  
                       FFFFFFFF.8244BF18  00000000.FFFFFFFC  
                       FFFFFFFF.8244BF20  00000008.00000000  
                       FFFFFFFF.8244BF28  00000000.00000001  
                       FFFFFFFF.8244BF30  00000008.00000000  
                       FFFFFFFF.8244BF38  00000000.FFFFFFFC  
INTSTK$Q_R2            FFFFFFFF.8244BF40  FFFFFFFF.80404668  SCH$GL_ACTIVE_PRIORITY
INTSTK$Q_R3            FFFFFFFF.8244BF48  FFFFFFFF.8042F280  SCH$WAIT_KERNEL_MODE
INTSTK$Q_R4            FFFFFFFF.8244BF50  FFFFFFFF.80615F00  
INTSTK$Q_R5            FFFFFFFF.8244BF58  00000000.00000000  
INTSTK$Q_R6            FFFFFFFF.8244BF60  FFFFFFFF.805AE000  
INTSTK$Q_R7            FFFFFFFF.8244BF68  00000000.00000000  
INTSTK$Q_PC            FFFFFFFF.8244BF70  00000000.FFFFFFFC  
INTSTK$Q_PS            FFFFFFFF.8244BF78  30000000.00000300  UCB$L_PI_SVA
                       FFFFFFFF.8244BF80  FFFFFFFF.80404668  SCH$GL_ACTIVE_PRIORITY
                       FFFFFFFF.8244BF88  00000000.7FFD00A8  PIO$GW_IIOIMPA
                       FFFFFFFF.8244BF90  00000000.00000000  
                       FFFFFFFF.8244BF98  FFFFFFFF.8042CD50  SCH$WAIT_PROC+00060
                       FFFFFFFF.8244BFA0  00000000.00000044  
                       FFFFFFFF.8244BFA8  FFFFFFFF.80403C30  SMP$GL_FLAGS
Prev SP (8244BFB0) =>  FFFFFFFF.8244BFB0  FFFFFFFF.8042CD50  SCH$WAIT_PROC+00060
                       FFFFFFFF.8244BFB8  00000000.00000000  
                       FFFFFFFF.8244BFC0  FFFFFFFF.805EE040  
                       FFFFFFFF.8244BFC8  FFFFFFFF.8006DB54  PROCESS_MANAGEMENT_NPRO+0DB54
                       FFFFFFFF.8244BFD0  FFFFFFFF.80404668  SCH$GL_ACTIVE_PRIORITY
                       FFFFFFFF.8244BFD8  FFFFFFFF.80615F00  
                       FFFFFFFF.8244BFE0  FFFFFFFF.8041B220  SCH$RESOURCE_WAIT
                       FFFFFFFF.8244BFE8  00000000.00000044  
                       FFFFFFFF.8244BFF0  FFFFFFFF.80403C30  SMP$GL_FLAGS
                       FFFFFFFF.8244BFF8  00000000.7FF95E00  
      

The SHOW STACK command displays a system stack on an OpenVMS Alpha system. The data shown before the stack pointer may not be valid. The mechanism array, signal array, and exception frame symbols displayed on the left appear only for INVEXCEPTN, FATALEXCPT, UNXSIGNAL, and SSRVEXCEPT bugchecks.


 
 


#2

SDA> SHOW STACK/SUMMARY
Stack Ranges 
------------ 
 
Memory Stack: 
 
     Stack         Stack Base          Stack Limit        Stack Pointer       Notes 
  -----------   -----------------   -----------------   -----------------   --------- 
  Kernel        00000000.7FF44000   00000000.7FF2C000   00000000.7FF43EB0   Current 
  Executive     00000000.7FF68000   00000000.7FF58000   00000000.7FF68000 
  Supervisor    00000000.7FFAC000   00000000.7FFA8000   00000000.7FFAC000 
  User          00000000.3FFE2000   00000000.3FFCA000   00000000.3FFE1FB0   KPstack 
  User          00000000.3FFFE000   00000000.3FFE6000   00000000.3FFFDDB0   KPstack 
  User          00000000.7AC9E000   00000000.7AC9A000   00000000.7AC9D830 
  System        FFFFFFFF.86970000   FFFFFFFF.86958000   FFFFFFFF.8696FFC0 
 
 
Register Stack: 
 
     Stack         Stack Base          Stack Limit        Stack Pointer       Notes 
  -----------   -----------------   -----------------   -----------------   --------- 
  Kernel        00000000.7FF12000   00000000.7FF2A000   00000000.7FF12250   Current 
  Executive     00000000.7FF46000   00000000.7FF56000   00000000.7FF46000 
  Supervisor    00000000.7FF6A000   00000000.7FF8A000   00000000.7FF6A000 
  User          000007FD.BFF3C000   000007FD.BFF54000   000007FD.BFF3C160   KPstack 
  User          000007FD.BFF58000   000007FD.BFF70000   000007FD.BFF58108   KPstack 
  User          000007FD.C0000000   000007FD.C0002000   000007FD.C0000268 
  System        FFFFF802.0F236000   FFFFF802.0F24E000   FFFFF802.0F236278 
      

This example shows the stack ranges for a process on an OpenVMS I64 system.


SHOW SUMMARY

Displays a list of all active processes and the values of the parameters used in swapping and scheduling these processes.

Format

SHOW SUMMARY [/IMAGE|/PROCESS_NAME=process_name
|/THREAD|/USER=username]


Parameters

None.

Qualifiers

/IMAGE

Causes SDA to display, if possible, the name of the image being executed within each process.

/PROCESS_NAME=process_name

Displays only processes with the specified process name. You can use wildcards in process_name, in which case SDA displays all matching processes. The default action is for SDA to display data for all processes, regardless of process name.

/THREAD

Displays information on all the current threads associated with the current process.

/USER=username

Displays only the processes of the specified user. You can use wildcards in username, in which case SDA displays processes of all matching users. The default action is for SDA to display data for all processes, regardless of user name.

Description

The SHOW SUMMARY command displays the information in Table 4-29 for each active process in the system.

Table 4-29 Process Information in the SHOW SUMMARY Display
Column Contents
Extended PID The 32-bit number that uniquely identifies the process or thread.
Indx Index of this process into the PCB array. When SHOW SUMMARY/THREAD is used, for all threads of a process other than the initial thread, displays the thread number.
Process name 1 Name assigned to the process.
Username 1 Name of the user who created the process.
State Current state of the process. Table 4-30 shows the 14 states and their meanings.
Pri Current scheduling priority of the process.
PCB/KTB Address of the process control block or address of the kernel thread block.
PHD 1 Address of the process header.
Wkset 1 Number (in decimal) of pages currently in the process working set.


1When SHOW SUMMARY/THREAD is used, this column is blank for all threads other than the initial thread.

Table 4-30 Current State Information
State Meaning
COM Computable and resident in memory
COMO Computable, but outswapped
CUR nn Currently executing on CPU ID nn
CEF Waiting for a common event flag
LEF Waiting for a local event flag
LEFO Outswapped and waiting for a local event flag
HIB Hibernating
HIBO Hibernating and outswapped
SUSP Suspended
SUSPO Suspended and outswapped
PFW Waiting for a page that is not in memory (page-fault wait)
FPG Waiting to add a page to its working set (free-page wait)
COLPG Waiting for a page collision to be resolved (collided-page wait); this usually occurs when several processes cause page faults on the same shared page
MWAIT Miscellaneous wait
RWxxx 1 Waiting for system resource xxx
TBS 1 Waiting "To Be Scheduled" by class scheduler
TBSO 1 Waiting "To Be Scheduled" and outswapped
TBS_P 1 "To Be Scheduled" state is pending
TBSPO 1 "To Be Scheduled" state is pending and outswapped
WTBYT 1 Waiting for BYTCNT quota
WTTQE 1 Waiting for TQCNT quota


1These states represent additional interpretation by SDA of one of the 14 scheduler states.


Example


SDA>  SHOW SUMMARY
Current process summary
-----------------------
 Extended Indx Process name    Username    State   Pri PCB/KTB    PHD    Wkset
-- PID -- ---- --------------- ----------- ------- --- -------- -------- ------
 00000041 0001 SWAPPER                      HIB     16 80C641D0 80C63E00   0
 00000045 0005 IPCACP          SYSTEM       HIB     10 80DC0780 81266000  39
 00000046 0006 ERRFMT          SYSTEM       HIB      8 80DC2240 8126C000  57
 00000047 0007 OPCOM           SYSTEM       HIB      8 80DC3340 81272000  31
 00000048 0008 AUDIT_SERVER    AUDIT$SERVER HIB     10 80D61280 81278000 152
 00000049 0009 JOB_CONTROL     SYSTEM       HIB     10 80D620C0 8127E000  50
 0000004A 000A SECURITY_SERVER SYSTEM       HIB     10 80DC58C0 81284000 253
 0000004B 000B TP_SERVER       SYSTEM       HIB     10 80DC8900 8128A000  75
 0000004C 000C NETACP          DECNET       HIB     10 80DBFE00 8125A000  78
 0000004D 000D EVL             DECNET       HIB      6 80DCA080 81290000  76
 0000004E 000E REMACP          SYSTEM       HIB      8 80DE4E00 81296000  14
 00000050 0010 DECW$SERVER_0   SYSTEM       HIB      8 80DEF940 812A2000 739
 00000051 0011 DECW$LOGINOUT   <login>      LEF      4 80DF0F00 812A8000 273
 00000052 0012 SYSTEM          SYSTEM       LEF      9 80D772C0 81260000  75
 
 
      

The SHOW SUMMARY command describes all active processes in the system at the time of the system failure. Note that there was no process in the CUR state at the time of the failure.


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