Page of GC20-1807-7 As Updated April 1, 1981 by TNL GN25-0829
sss is a hexadecimal number indicating the number of pages
resident in real storage
ttt is a hexadecimal number indicating the working set size.
Note: The order of the users in the INDICATE QUEUES response
is as follows:
1. Q1 and Q2 users in runlist priority order (that is,
dispatching priority order).
2. Eligible list El users in scheduling priority order.
3. Eligible list E2 users in scheduling priority order.
INDICATE 1/0 provides information about conditions leading to possible 1/0 contention within the system. The response gives the userids
of all the users in I/O wait state at that instant in time,
and the address of the real device to which the most recent
virtual SIO was mapped. Because the response indicates only
an instantaneous sample, use the command several times before
assuming a condition to be persistent. If it is persistent,
run the SEEKS option of the MONITOR command to conduct a
thorough investiqation of the suggested condition.
The response to the INDICATE 1/0 option is as follows: useridl cuu userid2 cuu • •• (up to 5 userids per line)
useridn
is the user identification.
cuu indicates the real device address.
In the case where a virtual machine may have issued multiple SIOs, the response indicates the real device address
corresponding to the most recent one issued.
INDICATE PAGING WAIT 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 in system performance. Use the
INDICATE PAGING WAIT option when the INDICATE QUEUES option
shows that a significant proportion of the users in queue1 and
queue2 are persistently in page wait. The response to the
command gives the userids of those users currently in page
wait and the numbers of page frames allocated on drum and on
disk.
The response to the INDICATE PAGING WAIT option is as follows:
userid 1 nnn: mmm userid2 nnn: mmm ••• (up to 4 userids per line)
useridn
is the user identification.
nnn is the hexadecimal number of pages allocated on drum for
these users. 108 IBM VM/370 System programmer!s Guide

mmm is the hexadecimal number of pages allocated on disk fer
these users. Consider, for example, the following response:
usera 010:054 userb 127:000 If the two users were to execute prograas of si.ilar
characteristics, then usera would be expected to experience
more pagewait than userb. Also, if the level of multiprogramming were to be low during the execution of
usera's progra., then aore system page wait would occur than
during the execution of userb's program.
If users appear to have most of their pages allocated on disk,
it would be useful to know which users are occupying most of
the primary paging device space, and whether or not they are
still active. (That is, a virtual machine that is running a large operating system aay have been allocated large a.ounts
of primary paging device space at IPt time but then may have
become inactive. Consequently, the machine is occupying a
critical resource that could be put to better use.
IBDICATE PAGING ALL
displays the page residency data of all users of the system (including the system nucleus and pageable routines). The response is identical to that of the INDICATE PAGING WAll option. NO USERS IN QUEUE is issued for the INDICATE QUEUES option when appropriate. NO USERS IN I/O WAIT is issued for the INDICATE I/O option when appropriate. NO USERS IN PAGEWAIT is issued for the INDICATE PAGING WAIT option when appropriate. Part 2. Control Program (CP) 109