topic Re: maximum files opened by a process in Operating System - OpenVMS

maximum files opened by a process

Morcos — Thu, 13 Jan 2005 09:46:25 GMT

Hi all,
I'm studying for the openVms exam and I have a question :
run process/detached/file_limit=30
If PQL_MFILLM=50 or any value >30
what is the maximum files that can be opened by this process.
If anyone has an idea i'll be grateful and thx in advance.

Re: maximum files opened by a process

Uwe Zessin — Thu, 13 Jan 2005 10:08:12 GMT

PQL_MFILLM will override other sources when it is higher. That is valid for other PQL_M* parameters as well.

Good luck on the exam!

Re: maximum files opened by a process

Kris Clippeleyr — Thu, 13 Jan 2005 10:13:12 GMT

Hi,

FILLM is maximized against PQL_MFILLM.
According to the docs:

A process cannot be created with a quota less than this minimum. Any quota value you specify is maximized against this minimum.
...
Open file quota. This quota limits the number of files that a process can have open at one time.
Minimum: PQL_MFILLM
Default: PQL_DFILLM
Pooled

Note however that it is a "pooled" quota, meaning:

Pooled quotas are established when a detached process is created, and they are shared by that process and all its descendent subprocesses. Charges against pooled quota values are subtracted from the current available totals as they are used and are added back to the total when they are not being used.

Kris (aka Qkcl)

Re: maximum files opened by a process

Wim Van den Wyngaert — Thu, 13 Jan 2005 10:28:56 GMT

And don't forget your std files (sys$*). They eat the quota too.

Wim

Re: maximum files opened by a process

Uwe Zessin — Thu, 13 Jan 2005 10:43:15 GMT

There is FILLM and CHANNELCNT. Not all I/O channels are counted against FILLM.

Re: maximum files opened by a process

John Gillings — Thu, 13 Jan 2005 19:51:33 GMT

ziad,

It looks like the point of your question is for you to recognise that the PQL_M parameters override lower quota settings, like qualifiers to the RUN command.

Keep in mind that the OpenVMS exam questions avoid tricks and trivia. Just stick to the facts presented.