flush the log of detached process quicker

[labadie_1]

For the batch jobs, I know the $ set output_rate=small to read the log file quickly.

With my Vms 7.3-1, it seems that a detached process needs 1 minute before the log file can be read (run sys$system:loginout/detach/auth/input=a.com/output=a.log...)

can I modify this one minute time to a smaller value ?

[labadie_1]

Well in fact it is quite easy...

[Wim Van den Wyngaert]

Didn't test it but help set out
says it is valid for detached too.

Wim

[Lokesh_2]

Hi ,

I tested it and it works for detached too.

Thanks & regards,
Lokesh

[labadie_1]

Yes, but it would not work if I run my.exe instead of loginout :-)

[labadie_1]

is one minute wait a system parameter or hard coded ?

[Wim Van den Wyngaert]

If you do run my without /detach, it is not a detached process.

Wim

[Antoniov.]

Hi Gerard,
when you execute loginout you run a command file within /INP qualifier that's like a batch execution;
when you type run/detach execute a image file and /INP qualifier is the standard input for your detached process, not the comand file.

Antonio Vigliotti

[Uwe Zessin]

Can't you do a periodic FLUSH on the output channel?

[John Gillings · Accepted solution]

Gerard,

A better approach than relying on OUTPUT_RATE is to use RMS shared files. For example, consider the DCL:

$ CREATE MYLOG.LOG
$ OPEN/APPEND/SHARE OUT MYLOG.LOG
...
$ WRITE OUT SomeRecord


From another process, this file can be read because it's open for SHARE access. HOWEVER! the EOF mark won't be updated unless RMS thinks someone else wants to write to the file. So:

$ OPEN/READ/WRITE/SHARE IN MYLOG.LOG
$ CLOSE IN
$ TYPE MYLOG.LOG

will always display the complete contents at the time of the CLOSE.

For most languages you just need to add SHARE when you OPEN the log file. (I haven't found a simple way to make this happen for implicit output files or process permanent file like SYS$OUTPUT)

[Antoniov.]

Look at this command procedure example:
$ DEF SYS$OUTPUT MYPROC.LOG
$ SET OUTPUT=:00:30
$ RUN/DETACH MYPROG.EXE
$ EXIT

Antonio Vigliotti

[Wim Van den Wyngaert]

Wouldn't it be nice if engeneering added
"a flush of deferred written records whenever RMS thinks someone else wants to read or write to the file" ?

This way deferred write can be used and contents can be viewed. Without any tricks.

Wim

[Jan van den Ende]

Wim,

Great idea!

Maybe you SHOULD formally suuggest it to Engeneering?

You may point to me as seconding!!

Jan