Open System Services Management and Operations Guide (H06.06+)

Environment Limits
Open System Services Management and Operations Guide—527191-004
E-3
OSS file
opens per
application
process,
using the
select()
function to
manage I/O
1,024
4,096
Prior to RVU G06.26 (prior to
NPV T9055 G12), the limit was
1,024.
OSS file
opens per
terminal
process,
when using
the
select()
function and
nonblocking
terminal I/O
1 The OSS terminal helper
process only accepts one open
per terminal process
OSS file
opens per
processor
Approximately
12,000
Limiting resource is OSS
POSIX extended segment
(PXS) memory.
Prior to SPR T8620ABT, the
limit was approximately 7,750.
Usage can be checked
with Measure by looking
at the OSSCPU entity; at
a MEASCOM prompt:
ADD OSSCPU *
START MEASUREMENT
mymeas
STOP MEASUREMENT
mymeas
LIST OSSCPU *
OSS
pthreads per
process
At least
10,000
The limiting factor is available
memory.
OSS
sockets per
processor
4,096
OSS pipes
per
processor
135 to 1,024,
depending on
message size
Prior to SPR T8620ABT, the
limit was 39 to 256, depending
on message size.
Device
labels per
node
ZZZZZ
32
-
480
10
Certain label designators are
skipped.
At a TACL prompt, use
the SCF INFO FILESET *,
DETAIL command.
Table E-1. OSS Environment Limits (page 3 of 4)
Description
Maximum
Value Comment
To Check Amount
Currently Used