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OpenVMS Alpha System Analysis Tools Manual

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SPL STOP COLLECT

Stops the spinlock collection, but does not stop spinlock tracing.

Format

SPL STOP COLLECT

Parameters

None.

Qualifiers

None.

Description

The SPL STOP COLLECT command stops the data collection, but does not affect tracing. This allows the user to start another collection for a different spinlock during the same trace run.

Example


SDA> SPL STOP COLLECT

SPL STOP TRACE

Disables spinlock tracing, but it does not deallocate the trace buffer.

Format

SPL STOP TRACE

Parameters

None.

Qualifiers

None.

Description

The SPL STOP TRACE command stops tracing, but leaves the trace buffer allocated for further analysis.

Example


SDA> SPL STOP TRACE
Tracing stopped...

SPL UNLOAD

Unloads the SPL$DEBUG execlet and performs cleanup. Tracing is automatically disabled and the trace buffer deallocated.

Format

SPL UNLOAD

Parameters

None.

Qualifiers

None.

Description

The SPL UNLOAD command disables the tracing or collection functionality with a delay to a state of quiescence. This ensures that all pending trace operations in progress have finished before the trace buffer is deallocated. Finally the SPL UNLOAD command unloads the SPL$DEBUG execlet.

Example


SDA> SPL UNLOAD
SPL$DEBUG unload status = 00000001

Chapter 7
SDA Extended File Cache (XFC) Extension Commands

This chapter describes the SDA extension commands for the Extended File Cache (XFC).

7.1 Overview of SDA Extensions That Support the Extended File Cache (XFC)

The SDA extension commands for Extended File Cache (XFC) enable you to perform the following tasks:

  • Display, in a convenient and readable format, various XFC data structures
  • Display, in a convenient and readable format, statistics that aid in tuning the extended file cache

7.2 Listing of SDA Extended File Cache (XFC) Extension Commands

The section describes the following SDA XFC extension commands:

EXIT
LOAD DSF
SHOW CONTEXT
SHOW EXTENT
SHOW FILE
SHOW MEMORY
SHOW SUMMARY
SHOW TABLES
SHOW TRACE
SHOW VOLUME

EXIT

Exits the XFC SDA extensions.

Format

EXIT

Parameters

None.

Qualifiers

None.

Description

The EXIT command issued from the SDA> prompt exits you from SDA to the DCL ($) prompt. If you invoke XFC at the SDA> prompt, you receive an XFC> prompt, from which you can then invoke a specific command, for example, SHOW SUMMARY. If you invoke EXIT at the XFC> prompt, you are returned to the SDA> prompt.
Example 


SDA> XFC
XFC> SHOW SUMMARY
XFC Summary
-----------
Extended File Cache V1.0 (May  6 2002 11:33:46)
Anchor Block Address:             FFFFFFFF80D30410
Build Id:
Cache State:                      0000A010
Cache in no-cache state:          False
   .
   .
   .
XFC>EXIT
SDA>

This command shows the procedure for exiting from the XFC extension.

LOAD DSF

Loads the symbols in the specified debug symbol file (DSF) for use with the SDA FORMAT command.

Format

LOAD DSF filename

Parameter

filename

The name of the symbol file.

Qualifiers

None.

Description

The LOAD DSF command loads the symbol tables for the XFC internal data structures. The XFC symbol tables are contained in a file SYS$XFCACHE.DSF, which is located in the system directory, SYS$LOADABLE_IMAGES.

Example


SDA> XFC SHOW FILE/BRIEF
XFC Cache File Block brief listing
----------------------------------
CFB Address      CVB Address      Volume Name       File ID           Access
FFFFFFFD83120D40 FFFFFFFD831FA080 DISK$FRROOG_RUBY            (541,5,0)    0
   .
   .
   .
SDA> FORMAT FFFFFFFD83120D40
%SDA-E-NOSYMBOLS, no "VCC_CFB" symbols found to format this block
DA> xfc load dsf sys$loadable_images:sys$xfcache
Reading symbols from SYS$SYSROOT:[SYS$LDR]SYS$XFCACHE.DSF;21
Loaded 825 symbols>
SDA>  FORMAT FFFFFFFD83120D40
FFFFFFFD.83120D40   CFB$R_PSNOLDHEADER              00000001
FFFFFFFD.83120D44                                   00000001
FFFFFFFD.83120D48   CFB$W_UWMUSTBEONE                   0001
FFFFFFFD.83120D4A   CFB$B_BTYPE                       6F
FFFFFFFD.83120D4B   CFB$B_BSUBTYPE                  40
FFFFFFFD.83120D4C   CFB$R_PFCBFILE                  81935900
FFFFFFFD.83120D50   CFB$Q_UQSIZE                    0000021C
FFFFFFFD.83120D54                                   00000000
FFFFFFFD.83120D58   CFB$R_PCVBCACHEVOLUME           831FA080
FFFFFFFD.83120D5C                                   FFFFFFFD
FFFFFFFD.83120D60   CFB$R_QHDQUEUEHEAD              83120B40
FFFFFFFD.83120D64                                   FFFFFFFD
FFFFFFFD.83120D68                                   83121800
FFFFFFFD.83120D6C                                   FFFFFFFD
   .
   .
   .

This example shows the output of loading symbols from the XFC debug symbols file, and using those symbols to format a CFB structure.

SHOW CONTEXT

Displays the contents of an XFC context block (CTX).

Format

SHOW CONTEXT [address][/STALLING|/FULL|/BRIEF]

Parameter

address

The address of the CTX. If no address is supplied, then all the context structures are displayed.

Qualifiers

/BRIEF

Displays a brief summary for each context; for example, the I/O type, start virtual block number (VBN), and length of I/O.

/FULL

Displays the complete context structure. This is the default.

/STALLING

Displays only contexts that are stalling; for example, those that have a stall reason code other than estrNotStalling.

Description

The SHOW CONTEXT command displays the contents of an active context block. The state of each active operation within XFC is maintained in a data structure called a context block.

Examples

This example shows the address of the context block, I/O type (the type of operation), I/O phase (what phase the operation is in), I/O stall (reason for its stalling), volume ID (address of the control volume block), start VBN (starting VBN of the I/O), length of the I/O, and I/O request packet (the address of the IRP). 


2. SDA> XFC SHOW CONTEXT FFFFFFFF8190D690
List of All XFC Active Contexts (CTX)
-------------------------------------
Context (CTX) Address: FFFFFFFF8190D690
I/O Phase:             eiopFillContext
I/O Type:              eiotReadThrough
Operation started:   17-APR-2002 11:23:29.00
Stall Reason:          estrWindowTurn
Stall Extent:          0000000000000000
Stall Op (IRP):        FFFFFFFF81267A40
Saved AST Parameter:   0000000000000000
Restart Routine:       0000000000000000
Context state flags    00000000
  Cache Hit:               False
  HWM Checked:             False
  Fork Restarted           False
  AST Required (flush)     False
  Buffer locked            False
  Stalled converting       False
  Fork Block in use        False
  Override resource checks False
  Restart cluster trans    False
  Restart cluster flush    False
  MV volumes skipped       False
  Depose pending           False
  Ignore CFB Quiesce       False
  Delete CFB               False
  Read-ahead hit           False
ECB Count:                      0
Index:                 00000000 (         0)
Start VBN:             000107C1 (     67521)
Length in Blocks:      00000020 (        32)
Next VBN:              000107C1 (     67521)
I/O Extent Count:               0
Disk I/O Length:       00000020 (        32)
Bytes Copied:                   0
Bytes Zeroed:                   0
Bytes Requested:            16384
Volume (CVB):          0000000000000000
Volume Id:             FFFFFFFD8311BD00
File Id:               0000000000000C54
Cache File Block:      FFFFFFFD82CEA2A0
Process (PCB):         FFFFFFFF818FA500

This example shows output of a full display of a context block for a read I/O.

SHOW EXTENT

Displays the contents of an extent control block (ECB).

Format

SHOW EXTENT address

Parameter

address

The address of the ECB.

Qualifiers

None.

Description

The SHOW EXTENT command diplays the contents of an extent control block (ECB). The data in the cache is divided into groups of VBNs called extents. Each extent is maintained in a data structure called an extent control block.

Example


SDA> XFC SHOW EXTENT FFFFFFFD82A58A20
Cache Extent Address:  FFFFFFFD82A58A20
Type:                  Primary
Flink:                 FFFFFFFF7F880350
Blink:                 FFFFFFFF7F880350
Start VBN:             00000001 (         1)
Start LBN:             00BA711C (  12218652)
Length in Blocks:      00000006 (         6)
Data State:            Clean
Pin:                   None
Buffer Address:        FFFFFFFDB0996000
Secondary ECB Queue:   FFFFFFFD82A58A60
    Flink:               FFFFFFFD83199A20
    Blink:               FFFFFFFD83199A20
Primary ECB:           0000000000000000
LRU Queue:             FFFFFFFD82A58AAC
    Flink:               FFFFFFFD82A5A26C
    Blink:               FFFFFFFD82A5344C
Waiters Queue:         FFFFFFFD82A58A50
    Flink:               FFFFFFFD82A58A50
    Blink:               FFFFFFFD82A58A50
Lock Id:               00000000
Parent CFB:            FFFFFFFD82A61180
ECB delete pending     False
ECB on LRU queue       True
ECB depose pending     False
ECB read ahead         False
LRU priority:             1

This example shows the contents of an extent control block.

SHOW FILE

Displays the contents of the cache file block (CFB).

Format

SHOW FILE [address] [/EXTENTS|/ID=file-id
|/CVB=address |/OPEN|/CLOSED|/STATISTICS |/FULL
|/BRIEF]

Parameter

address

The address of the CFB. The /OPEN and /CLOSED qualifiers, if present, are ignored. If no address is supplied, then all the CFBs are displayed.

Qualifiers

/BRIEF

Displays summary information for each cache file block (CFB), such as the CFB address, cache volume block (CVB) address, access count, active I/O count, and file ID.

/CLOSED

Displays only CFBs whose access count is zero.

/CVB=address

Displays only information about any files matching the given cache volume block address.

/EXTENTS

Displays the cache extents held in cache for any displayed files. This shows the primary and secondary cache extents along with their data state and virtual block numbers (VBNs). It also shows a summary of memory usage (pagelets used and pagelets valid) for any displayed files. The /EXTENTS qualifier is incompatible with the /BRIEF qualifier.

/FULL

Displays all fields for each cache file block. This is the default.

/ID=file-id

Displays only information about any files matching the given file-identification (FID). The file identification (FID) is the hexadecimal file number component in a format file ID (file number, sequence number, relative volume number).

/OPEN

Displays only CFBs whose access count is greater than zero.

/STATISTICS

Displays more statistics about the specified file. The /STATISTICS qualifier is incompatible with the /BRIEF qualifier.

Description

The SHOW FILE command displays the contents of the XFC cache file block. The state of any file in the cache is maintained in a data structure called a cache file block (CFB). There is a CFB for every open file on a system and a CFB for each closed file that is still being cached.
Examples

This example shows the brief output from this command. 


2. SDA> XFC SHOW FILE/STATISTICS FFFFFFFD831A24C0
Full Cache File Block (CFB) Details
-----------------------------------
CFB Address:           FFFFFFFD831A24C0
CFB Address:           FFFFFFFD831A24C0
Flink:                 FFFFFFFD831A22C0
Blink:                 FFFFFFFD831A2700
Access Count:                   1
Write Access Count:             0
Volume (CVB):          FFFFFFFD831FE080
Quiescing:             False
File (FCB):            FFFFFFFF81943D80
Volume Id:             FFFFFFFD831FE080
File Id:               0000000000000383
External FID:          (899,4,0)
Predicted Next VBN:    000000FB (       251)
Active Caching Mode:   Write Through
Active I/O count:               0
Flush Fail Status:     00000000 (         0)
No Readahead Reasons:           0
Active Readaheads:              0
File Bad:              False
Caching disabled:      False
File deleted on close: False
File Quiescing:        False
File Deposing:         False
File Deleting:         False
File BlkASTInProg:     False
File IgnoreBlkAST      False
File Readahead EOF     False
PECBs Allocated:               13 (        13 pages)
PECBs Deallocated:              0
PECBs Deallocated:              0
SECBs Allocated:                3
SECBs Deallocated:             19
Lock Id:               0C00037F
   Granted Lock mode:  PRMode
   Conversion phase:   Illegal
Conversion phase count:         1
Hash Bucket Queue:     FFFFFFFD831A2520
    Flink:               FFFFFFFF7FF819B0
    Blink:               FFFFFFFF7FF819B0
PECB Queue:            FFFFFFFD831A2530
    Flink:               FFFFFFFD8311888C
    Blink:               FFFFFFFD831A072C
Stalled IOs Queue:     FFFFFFFD831A24F0
    Flink:               FFFFFFFD831A24F0
    Blink:               FFFFFFFD831A24F0
FAL transition Queue:  FFFFFFFD831A2500
    Flink:               FFFFFFFD831A2500
    Blink:               FFFFFFFD831A2500
Contexts Waiting:      FFFFFFFD831A2510
    Flink:               FFFFFFFD831A2510
    Blink:               FFFFFFFD831A2510
BlkASTs Waiting:       FFFFFFFD831A2540
    Flink:               FFFFFFFD831A2540
    Blink:               FFFFFFFD831A2540
Deaccess Wait List:    FFFFFFFD831A2600
    Flink:               0000000000000000
Quiesce context:       0000000000000000
Up convert context:    0000000000000000
File IO Statistics - all in decimal
-----------------------------------
Statistics Valid From:   19-APR-2002 07:10:32.77

Total QIOs to this file:                14
Read IOs to this file:                  14
Write IOs to this file:                  0
Write IOs to this file:                  0
Read Hits:                               6
Hit Rate:                           42.86 %
Average Overall I/O response time to this file
 in milliseconds:                     0.9525
Average Cache Hit I/O response time to this file
 in milliseconds:                     0.0702
Average Disk I/O response time to this file
 in milliseconds:                     1.6141
Accuracy of I/O resp time:                   65 %
Read Ahead Count:                        0
Read Through Count:                     14
Write Through Count:                     0
Read Around Count:                       0
Write Around Count:                      0
CFB FAL stalls:                          1
CFB Operation stalls:                    0
FAL Blocking ASTs:                       0
Quiesce Depose:                          0
Quiesce depose Stalls:                   0

(I/O size statistics not collected for this file)

Files found: 1

This example shows a collection of performance statistics for a file.

SHOW MEMORY

Displays information about memory used by the cache.

Format

SHOW MEMORY [/BRIEF|/FULL]

Parameters

None.

Qualifiers

/BRIEF

Displays summary statistics on XFC memory use.

/FULL

Displays full statistics on XFC memory use.

Examples

#1 

SDA> XFC SHOW MEMORY
XFC Memory Statistics
---------------------
Pool allocation calls           : 430
Pool allocation failures        : 0
Pool deallocation calls         : 0

Page allocation calls           : 2745
Page deallocation calls         : 6

Cache VA Regions and Limits
---------------------------
Cache VA region from FFFFFFFD80000000 to FFFFFFFF80000000 ( 1048576 pages)

  permanent area   : FFFFFFFD80000000 to FFFFFFFDBE800000 (  128000 pages)
            pool   : FFFFFFFD80000000 to FFFFFFFD83200000 (    6400 pages)
            data   : FFFFFFFD83200000 to FFFFFFFDBE800000 (  121600 pages)

  dynamic area     : FFFFFFFDBE800000 to FFFFFFFF7F780000 (  919488 pages)
          pool     : FFFFFFFDBE800000 to FFFFFFFDD4F2C000 (   45974 pages)
          data     : FFFFFFFDD4F2C000 to FFFFFFFF7F780000 (  873514 pages)

  extent hash table: FFFFFFFF7F780000 to FFFFFFFF7FF80000 (    1024 pages)
  file hash table  : FFFFFFFF7FF80000 to FFFFFFFF80000000 (      64 pages)
  file hash table  : FFFFFFFF7FF80000 to FFFFFFFF80000000 (      64 pages)

qhdPermanentPoolFreePages       : FFFFFFFF80D305B8
qhdPermanentDataFreePages       : FFFFFFFF80D305C8
Non-Paged Pool allocated        : 45248 (44.1 KB)
Non-Paged Pool number of - FKBs :      403
Non-Paged Pool number of - DBMs :        3
Non-Paged Pool number of - CTXs :       10
Current Maximum Cache Size      : 8589934592 (8.0 GB)
Boottime Maximum Cache Size     : -1

Permanent Data Pages: Allocated :   121600
                      In use    :     2739
          Pool Pages: Allocated :     6400
                      In use    :      128

Dynamic Pages: Max Allowed      :   919488
               Allocated        :        0
               In use           :        0
               Min Allowed      :    20971
   Data Pages: Allowed          :   873514
               In use           :        0
   Pool Pages: Allowed          :    45974
               In use           :        0
                  PFN List      :        0
                  Non PFN List  :        0


Total Cache Memory (bytes)      : 1048621248 (1000.0 MB)

Private PFN List Stats
----------------------
Dynamic Area PFN List           : FFFFFFFF818EB340
Free physical pages on list     : 0
Pages attributed to this list   : 0
Pages being requested for return: 0
List priority                   : 0
Callback routine                : 80DF8A40
Free PFN queue head             : FFFFFFFF818EB350
  First free page               : 0000000000000000
  Last free page                : 0000000000000000

MMG Callback Counters
---------------------
MMG callback active             : 0
MMG callback count              : 0
MMG callback requeues           : 0
MMG callback requeue again      : 0
Expand attempts callback active : 0
Pages reclaimed                 : 0
Trim reclaim attempts           : 0
LRU depose calls TrimWorkingSet : 0
Zone Purges: Permanent          : 0
             Dynamic PFNLST     : 0
             Dynamic No PFNLST  : 0

Pool Zone Stats (S2 Space)        Permanent    Dynamic
SECB: Size 112,  PerPage 71
    Pages / MaxPages             12 / 6400     |||   0 /  45974
    FreePkts / TotalPkts         64 /  852     |||   0 /      0
    Hits                       5499            |||   0
    Not first page                0            |||   0
    Misses (expns/fails)         12 (   12 /0) |||   0 (      0 /        0)

PECB: Size 176,  PerPage 45
    Pages / MaxPages             85 / 6400     |||   0 /    45974
    FreePkts / TotalPkts          6 / 3825     |||   0 /        0
    Hits                       3740            |||   0
    Not first page                0            |||   0
    Misses (expns/fails)         85 (   85 /0) |||   0 (        0 /        0)

CFB: Size 544,  PerPage 14
    Pages / MaxPages             29 / 6400     |||   0 /    45974
    FreePkts / TotalPkts          3 /  406     |||   0 /        0
    Hits                        488            |||   0
    Not first page                0            |||   0
    Misses (expns/fails)         29 (   29 /0) |||   0 (        0 /        0)

CVB: Size 608,  PerPage 13
    Pages / MaxPages              2 / 6400     |||   0 /    45974
    FreePkts / TotalPkts         12 /   26     |||   0 /        0
    Hits                         12            |||   0
    Not first page                0            |||   0
    Misses (expns/fails)          2 (    2 /0) |||   0 (        0 /        0)

IOSIZE: Size 3120,  PerPage 2
    Pages / MaxPages              0 / 6400     |||   0 /    45974
    FreePkts / TotalPkts          0 /    0     |||   0 /        0
    Hits                          0            |||   0
    Not first page                0            |||   0
    Misses (expns/fails)          0 (    0 /0) |||   0 (        0 /        0)

This example shows the full output from this command.

#2 

SDA> XFC SHOW MEMORY/BRIEF
XFC Memory Summary
------------------
Current Maximum Cache Size      : 8589934592 (8.0 GB)
Boottime Maximum Cache Size     : -1

Permanent Data Pages: Allocated :   121600
                      In use    :     2739
          Pool Pages: Allocated :     6400
                      In use    :      128

Dynamic Pages: Max Allowed      :   919488
               Allocated        :        0
               In use           :        0
               Min Allowed      :    20971
   Data Pages: Allowed          :   873514
               In use           :        0
   Pool Pages: Allowed          :    45974
               In use           :        0
                  PFN List      :        0
                  Non PFN List  :        0


Total Cache Memory (bytes)      : 1048621248 (1000.0 MB)

This example shows the brief output from this command.

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