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Conference azur::mcc

Title:	DECmcc user notes file. Does not replace IPMT.
Notice:	Use IPMT for problems. Newsletter location in note 6187
Moderator:	TAEC::BEROUD

Created:	Mon Aug 21 1989
Last Modified:	Wed Jun 04 1997
Last Successful Update:	Fri Jun 06 1997
Number of topics:	6497
Total number of notes:	27359

3116.0. "ultrix- semaphores and memory" by MICROW::LANG () Tue Jun 02 1992 10:32

    
    I'm working with MCC 1.2.7 on Ultrix.  (This is only relevant for
    Ultrix users.)  When I issue a manage and do an ipcs, I get:
    
    	1 m
    	2 s
    
    under my user name.  These do not go away when I exit from manage.
    Should they?  I looked in "Planning and Installation for Ultrix", but
    I didn't see this information.  
    
    There are also the following under /tmp:
    
    mcc_event_shared_memory_key
    mcc_lock_5F43434D4E4556454C5F5354004B434F00000000000000000000000000000000
    mcc_lock_5F43434D505349444450555F0045544100000000000000000000000000000000
    mcc_mm_start469
    
    		thanks,
    
    			Bonnie

T.R	Title	User	Personal Name	Date	Lines
3116.1	No automatic deletion	TOOK::MINTZ	Erik Mintz, dtn 226-5033	`Tue Jun 02 1992 11:07`	8
	No, they do not go away. They are used for the shared event pool. So they are created by the first user to start DECmcc, but are used by subsequent users as well. You can delete them manually if you like (with ipcrm), and then they will be recreated by the next user.
3116.2	new for 1.2.7?	MICROW::LANG		`Tue Jun 02 1992 12:55`	7
	ok, thanks. They are new with 1.2.7, aren't they? Bonnie
3116.3	Been there for a while...	TOOK::MINTZ	Erik Mintz, dtn 226-5033	`Tue Jun 02 1992 13:33`	3
	No, we have been using shared memory and semaphores since early baselevels of DECmcc for ULTRIX.
3116.4	Didn't see before	MICROW::LANG		`Tue Jun 02 1992 16:53`	9
	In the previous version, I didn't see the semaphores and the memory section after just issuing a manage. Do you know why? Is this configurable? (Can I turn it off?) thanks, Bonnie
3116.5		TOOK::SWIST	Jim Swist LKG2-2/T2 DTN 226-7102	`Thu Jun 04 1992 09:45`	4
	What problem are you trying solve? What do you want to turn off? MCC uses files in /tmp in conjunction with semaphores/shared mem for systemwide locks as well as event pool. You can't run without these.
3116.6	curious about why didn't see before	MICROW::LANG		`Thu Jun 04 1992 10:38`	8
	I was just concerned about the fact that in 1.2.7 when I issue manage, I see the semaphores/memory, whereas in 1.2.4 I (am practically positive) I could not see them when I issued manage. I thought if the event pool was configurable upon installation, that maybe we had previously had MCC installed without the event pool.
3116.7		TOOK::SWIST	Jim Swist LKG2-2/T2 DTN 226-7102	`Thu Jun 04 1992 14:05`	7
	We haven't changed this stuff at least back to 1.2.4 if not earlier. Can't explain what you see (of course if it was me I'd blame it on old age :-) Jim
3116.8	you are both rigth	TAEC::LAVILLAT		`Fri Jun 05 1992 10:57`	14
	To put my two cents in this discussion... What has always been is ipcs stuff : shared memory and semaphores. What has appeared around T1.2.7 (or X1.2.18) is the /tmp files. I think T1.2.4 was not putting any files in /tmp. Correct me if I am wrong.... Regards. Pierre.
3116.9		TOOK::SWIST	Jim Swist LKG2-2/T2 DTN 226-7102	`Fri Jun 05 1992 14:13`	4
	There have always been files in /tmp. What happened since 1.2.4 is that there are a couple more (of the form mcc_mmstart<uid>) which are used in an MM-startup interlock.