ENQ processes and semaphore 26 in SM66/SM50, SAPLSENA & SAPLSENT

Hi
We quite often see a number of DIA and ENQ processes in status 'running' with a Semaphore 26 error in SM66/SM50. Most of these (but not always all) show reads on tables SAPLSENA and SAPLSENT.
Many other processes - DIA, BTC and UPD - then have the 'stopped ENQ' status and also show reads on tables SAPLSENA, SAPLSENT and SAPLTHFB.
This doesn't last for that long but seems to be a common occurrence and we often get performance complaints during this time.
Note 33873 - What do the semaphores mean? - shows that this is the ENQ-TABLE-Semaphore.
One suggestion was that a filesystem backup running at the time was locking a file (enque related file??) but we have not been able to substaniate this. We could run the command fuser but which file is being locked?
We have already followed SAP Note 1384191 - Transaction SM50: Many processes with report SAPLSENA, but could not see any useful indicators in the log file produced.
Has anyone else experienced this or know how to check what is causing this?
Thanks
Ross

Hi Mark
enque/backup_file is set to the default, /usr/sap/S1P/DVEBMGS00/log/ENQBCK.
We have already ran fuser on this file, and although there appear to be a LOT of processes accessing the file, none of these belong to the filesystem backup which we thought may be locking it.
We are not using a standalone enqueue, the enqueue is part of the central instance.
What do you mean by dev_enqwork? I checked the dev_* files in /usr/sap/S1P/DVEBMGS50/work but there are a lot of files and a lot of meanlingless information, can't see anything useful here...
Are there any other files that the filesystem backup could be locking that could cause these issues? It seems to be backing up files in /usr/sap/S1P ... not sure it is this though as I have just seen ENQ semaphore 26 processes and there is no backup running now....
Ross

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Questions on SPINCOUNT and Semaphores

Hello,
I have a few more questions on SPINCOUNT and semaphores.
1) The documentation states that SPINCOUNT = 0 (default) uses the spincount "built into the delivered binary".
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- What is the built-in spincount for a native client?
2) "Semaphore appears stuck" (Q_CAT 1447) is reported when the semaphore for a queue cannot be obtained.
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Thanks...
Roger

Roger,
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Code for the BB semaphore and the semaphore used by /Domain follows a different rule. This code will log LIBTUX_CAT:5005 or LIBGW_CAT:5010 if a process has to wait for the semaphore for 10 seconds and the semaphore has never been released by the original owner during this time period.
3) TMSPINCOUNT is used for the BB semapahore, AOM semaphore, ACL semaphore, /Domain semaphore, and /Q semaphore. Locking the GTT uses the same BB semaphore that used to lock other tables in the BB.
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apple icon
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Other Potential Pertinent Info:
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MacBook Air
OSX v. 10.9
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iPhone iOS 7.0.4
iTunes v. 11.1.3 (8)
Summary Tab
Backups (This Computer)
Options
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You need to download iTunes on your computer. iOS 6 requires the latest version of iTunes which is 10.7.

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Solved!
Go to Solution.

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Check the source code of the function
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I tried to install yosemite yesterday and my computer goes through the whole installation process and then to a blank white screen. I've rebooted, I've reinstalled several times and get the same result. Two days wasted and I can't use my computer!!

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Probably will never ever think of buying a locked phone from AT&T cause its one of the worst system integrations ever that these companies could think of.
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Thanks

You got a confirmation from AT&T that it was authorized. Is this correct? - Yes i did get an email authorization on the 21st.
Then you connected the phone to a computer with the latest version of iTunes installed. You clicked on the phone's name in iTunes, then clicked "Backup Now". - Yes
When that finished you clicked "Restore iPhone" (NOT "Restore Backup") - Yes
Are you with me so far? - Yes.
And @ Varjak is right that after the 3rd restore I get the replacement error.
Plus I have NEVER jailbroken the iPhone. To give you another update, I spoke to a really nice apple tech in India who was atleast able to get me out of the replacement error by doing a recovery mode option. However, the lastest restore still gives me the same error
The SIM card inserted in this iPhone does not appear to be supported.
The SIM card that you currently installed in this iPhone is from a carrier that is not supported under the activation policy that is currently assigned by the activation server. This is not a hardware issue with the iPhone. Please insert another SIM card from a supported carrier or request that this iPhone be unlocked by your carrier. Please contact Apple for more information.
Message was edited by: jabgars

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I attempted to open a new window from the Firefox icon but nothing happens. I then went on browsing and closed Firefox but was later unable to open it. I checked processes and it was already running but there was no window displayed. I am running Windows 7 Professional.
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*CTRL+N
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'''If this reply solves your problem, please click "Solved It" next to this reply when signed-in to the forum.'''

I updated to Firefox 4 and ever since it won't open. It says the process is running but no matter how long I wait it won't open the browser and restarting or ending the process and trying again doesn't work either. Is there any way to fix this?

I thought it might be a compatibility issue with Windows Vista but the same problem happened on a computer with Windows 7. I'm not sure if the Windows 7 problem was resolved, though.

You probably have other problems but for a start right click on your task bar and click on Start Task Manager. In "Applications" if Firefox is shown, click on "End Task". In "Processes" if Firefox.exe is shown, click on "End Process" and ignore the warning and click"End Process" again. Wait for a few seconds then start Firefox in the usual way. There is a chance that this may solve your problems.
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https://support.mozilla.com/en-US/kb/Troubleshooting%20extensions%20and%20themes
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ENQ processes and semaphore 26 in SM66/SM50, SAPLSENA & SAPLSENT

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