as that of the INDICATE USER * option. For detailed discussion
of the class G INDICATE command, seefo£ QUEUES displays the active users, the queues that they are in, the
storage that they are occupying, and the status that they are
in. The display indicates those users currently dominatingmain storage. Users waiting in eligible lists are included in the
response because they are contending formain storage and it is
only by chance that they were not occupyingmain storage at the
time of thecommand. I/O provides information about conditions leading to possible
contention within the system. The response gives the userids of
all the users inI/O wait state at that instant in time, as well
as the address of the real device to which the most recentvirtual SIO was mapped. The response, however, does not show
the queue of users who issueSIOF to busy devices. Because the
response indicates only an instantaneous sample, use the command
several times beforeassuming a condition to be persistent. If
it is persistent, use theSEEKS operand of the MONITOR command
to conduct a thorough investigation of thesuggested condition.
PAGINGWAIT is provided for installations that have 2305s as primary paging
devices and other direct access devices as secondary paging
devices. A full primary device and subsequent allocation of
paging space on the slower device may be responsible for
degradation of the system's performance.Use the PAGING WAIT operand when the QUEUES operand shows that a significant
proportion of the users in queue 1 and queue 2 are persistently
in page wait. The response to the command gives the userids of
those users currently in page wait and the number of pageframes allocated on drum storage and on disk storage.
PAGING ALL
displays the page residency data of all users of thesystem (including the system nucleus and pageable routines). The
format of the reply message is identical to that of the PAGINGWAIT operand ..
The intent of the INDICATE command is twofold:
1. Provide the operator with a "snapshot" of system activities.
2. Provide ameans of determining the execution characteristics of a
program with respect to the resources it uses.
In respect to the latter, INDICATEUSER should be invoked before and
after the execution of aprogram. If the INtICATE USER command is
issued during the execution of the subject program and theprogram is
issuing spoolingI/O requests, the may questionable. The
reason this occurs is thatS08e fields (specifically, the PCB=nnnnnnn,
PTR=nnnnnn and RDR=nnnnnn fields) in the response to the INDICATEUSER co •• and are once (either at the beginning or at the end of an
operation). Other fields in the response areuFdated more dynamically. Consequently, you should avoid to halting or aborting any spooling
operation before itsnormal termination if the INDICATE USER command is
to be issued.Section 3. CP Commands 81
of the class G INDICATE command, see
storage that they are occupying, and the status that they are
in. The display indicates those users currently dominating
response because they are contending for
only by chance that they were not occupying
time of the
contention within the system. The response gives the userids of
all the users in
as the address of the real device to which the most recent
the queue of users who issue
response indicates only an instantaneous sample, use the command
several times before
it is persistent, use the
to conduct a thorough investigation of the
PAGING
devices and other direct access devices as secondary paging
devices. A full primary device and subsequent allocation of
paging space on the slower device may be responsible for
degradation of the system's performance.
proportion of the users in queue 1 and queue 2 are persistently
in page wait. The response to the command gives the userids of
those users currently in page wait and the number of page
PAGING ALL
displays the page residency data of all users of the
format of the reply message is identical to that of the PAGING
The intent of the INDICATE command is twofold:
1. Provide the operator with a "snapshot" of system activities.
2. Provide a
program with respect to the resources it uses.
In respect to the latter, INDICATE
after the execution of a
issued during the execution of the subject program and the
issuing spooling
reason this occurs is that
PTR=nnnnnn and RDR=nnnnnn fields) in the response to the INDICATE
operation). Other fields in the response are
operation before its
to be issued.