CHARS TRNSFD value, in DAILY COMMAND SUMMARY accounting report,
seemed to be bigger than actual. So I executed a program that
only executes open() and exit(), niether read() nor write().
I expected CHARS TRNSFD is 0, but it was 8240. What increases
this value ?
ANSWER
The output placed in the CHARS TRNSFD field of the Command Summary
report details all I/O associated with the command. This would
include the command that started it, the size of the command when
read into memory, and any AIX actions taken to run the application
such as signals and return codes.
As you probably have noticed the accounting system is not documented
very well, but the test I ran which was similar to yours, produced
similar results.Detailed information on what causes the CHARS
TRANSFD to be incremented is unavailable.
Is there any progress ? About one month passed......
ANSWER
R: I have been with development on this issue however their response
was not a enlightening as we would hope. Here is their response
below:
=====================================================================
The (struct acct) field ac_io is updated from the per-process (struct
user) field u_ioch. It is updated for read() or write() system calls.
The u_ioch field is cleared when the process initially forks and
prior to the time the final process is exec'd. I/O may be performed
by other programs which are run as part of the same processes
lifetime.
The read() and write() system calls are the only way that the field
in question is updated. Read-ahead, which you mentioned above,
does not cause the field to be updated.
=====================================================================
I apologize this took so long to respond to. If you have any further
questions please reopen the item.
Thank You.
S e a r c h - k e y w o r d s:
ACCOUNTING CHARS TRANSFD
WWQA: ITEM: RTA000069639 ITEM: RTA000069639
Dated: 05/1996 Category: ITSAI6000GE
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