Evaluate Performance in Detail › Performance Evaluation Report › Interpret the Process Statistics › View Process Statistics with an Emphasis on IO Metrics

View Process Statistics with an Emphasis on IO Metrics

The following report example illustrates the process statistics section with a focus on process IO related metrics, primarily presented as rates. Up to 3 top volume names associated with the IO activity are also displayed. The example uses the default primary and secondary keys of USERNAME and IMAGENAME. This format of the report is obtained by using the qualifier /PROCESS_STATISTICS=FOCUS=IO_RELATED. To view the report with a different orientation, provide your choice of sort keys. For example, the following syntax presents the statistics by imagename with a breakdown by user:

/PROCESS_STATISTICS=(FOCUS=IO_RELATED,PRIMARY_KEY=IMAGENAME,SECONDARY_KEY=USERNAME) 

Performance                   YQUEM (VAX 6000-440)                      Page   1
Evaluation                                                          PA Vx.x
Tuesday 26-JAN-1997 09:00 to 10:00
    +--------------------------------------------------------------------------------------------------------------------+
    | The following table gives the average I/O statistics for processes during the selected time frame.                 |
    +--------------------------------------------------------------------------------------------------------------------+
Primary/Secondary Key  DirI/O  BufI/O  HrdFlt  Img   Dsk Ops KB Thru -----Top Disk------ ---2nd Top Disk---- ---3rd Top Dsk-----
User/ Image             /Sec    /Sec    /Sec   Cnt      /Sec put/sec Volume Name  IO/sec Volume Name  IO/sec Volume Name  IO/sec
--------------------- ------- ------- ------- -----  ------- ------- ------------ ------ ------------ ------ ------------ ------
ARROYO
   (dcl)                 0.00    0.01    0.00     0     0.01     0.0     TRAINING   0.00      SYSPACK   0.00                0.00
   COPY                  0.00    0.07    0.00     1     0.01     0.1     TRAINING   0.00      SYSPACK   0.00                0.00
   DECPRESENT            0.08    1.06    0.00     0     0.09     0.2     TRAINING   0.08      SYSPACK   0.00                0.00
   DIRECTORY             0.00    0.01    0.00     1     0.00     0.0      SYSPACK   0.00                0.00                0.00
   MAIL                  0.06    0.14    0.02     2     0.08     0.8     TRAINING   0.05      SYSPACK   0.03        PAGER   0.00
BEYH
   (dcl)                 0.00    0.00    0.00     0     0.00     0.0      SYSPACK   0.00                0.00                0.00
   DECW_QUOTE            0.01    0.00    0.00     0     0.01     0.0        PAGER   0.01                0.00                0.00
   DQS$CLIENT            0.00    0.02    0.01     2     0.01     0.1      SYSPACK   0.01        PAGER   0.00                0.00
   MAIL                  0.23    3.07    0.02     1     0.28     1.5        SWDEV   0.26      SYSPACK   0.01        PAGER   0.00
   NOTES$MAIN            0.08    9.47    0.00     0     0.08     0.3        SWDEV   0.08                0.00                0.00
   RTPAD                 0.00    0.00    0.00     1     0.00     0.0                0.00                0.00                0.00
BHAT
   (dcl)                 0.00    0.05    0.00     0     0.01     0.0      SYSPACK   0.00        ADMIN   0.00                0.00
   COPY                  0.01    0.05    0.00     1     0.01     0.4        ADMIN   0.01      SYSPACK   0.00                0.00
   DECPRESENT            0.56    2.44    0.07     2     0.64     3.8        ADMIN   0.39      SYSPACK   0.25                0.00
   DIRECTORY             0.00    0.00    0.00     1     0.00     0.0                0.00                0.00                0.00
   MAIL                  1.63    0.43    0.01     1     1.64     8.2        ADMIN   1.61      SYSPACK   0.03        PAGER   0.00
   QUOTE_V0              0.00    0.01    0.00     1     0.00     0.0        ADMIN   0.00      SYSPACK   0.00                0.00
   SET                   0.00    0.00    0.00     2     0.00     0.0                0.00                0.00                0.00
   SUBMIT                0.00    0.00    0.00     1     0.00     0.0      SYSPACK   0.00                0.00                0.00
   VMSHELP               0.01    0.09    0.01     4     0.02     0.4      SYSPACK   0.02                0.00                0.00

User Command: ADVISE PERF REPORT PERF/NODE=YQUEM/BEG=26-JAN-1997 09:00:00.00/END=26-JAN-1997 10:00:00.00 -
  /INCLUDE=PROC/PROC=FOCU=IO/OUT=EXAMPLE_3_IO.INFO

The following statements describe the columns in the previous example:

• Primary/Secondary Key-This column lists the primary and secondary key identifiers for the process detail lines. The keys may be Mode, Username, Imagename, Processname, Account, UIC group, Workloadname, or PID.
• DirI/O /Sec-This column provides the average Direct I/O rate per second for the process or processes.
• BufI/O /Sec-This column provides the average Buffered I/O rate per second for the process or processes.
• HrdFlt /Sec-This column provides the average hard pagefault rate per second for the process or processes.
• Img Cnt-This column provides the number of image activations as a count for the process or processes.
• Dsk Ops /Sec-This column provides the average number of disk I/O operations per second for the process or processes.
• KB Thruput/sec-This column provides the average number of Kilobytes transferred to or from disks, per second, for the process or processes.
• Top Disk-Volume Name IO/sec

  This column provides both the volume name and average I/O rate, for the disk which this process or processes access most. Note that the I/O rate might be understated, and that some other disk might be accessed heavily but not reported, because the primary data collector is only capturing the top two devices that the process uses, each two minute interval. If an alternate collection is used, these columns show no data, since the data is not provided by an alternate collector.

• 2nd Top Disk-Volume Name IO/sec

  See previous paragraph.

• 3rd Top Dsk-Volume Name IO/sec

  See previous paragraph.