7.8.01.18: lots of "Semaphore Wait" during R3load export
We're exporting a 1 TB database using R3load with 32 processes.
I see in x_cons
I
D UKT UNIX TASK APPL Current Timeout/ Region Wait
tid type pid state Priority cnt try item
T82 12 20443 User 29455* Running 10 67 15624900(r)
T83 10 20441 User 27169* Running 1 66 17362372(r)
T85 9 20440 User 27432* Running 13 18 22136285(r)
T86 8 20439 User 29601* Semaphore Wait 0 19929257(d)
T87 13 20444 User 29765* Semaphore Wait 0 18315751(d)
T92 9 20440 User 26841* IO Wait (R) 0 21 22136285(r)
T93 13 20444 User 29737* Semaphore Wait 0 18315751(d)
T95 16 20447 User 29461* Running 70 54 13705379(r)
T96 11 20442 User 27767* Semaphore Wait 0 15100349(r)
T100 7 20438 User 29619* Semaphore Wait 0 19535885(s)
T104 11 20442 User 27090* IOWait(R)(041) 0 15100349(r)
T107 13 20444 User 26750**Enter ExclLock 1 0 18 18315751(d)
T110 14 20445 User 29476**Enter ExclLock 1 0 66 17785567(d)
T113 16 20447 User 29097* IO Wait (R) 0 9 13705379(r)
T114 8 20439 User 29435**Enter ExclLock 1 0 18 19929257(d)
T121 12 20443 User 29125* IO Wait (R) 0 33 15624900(r)
T122 10 20441 User 27823* IO Wait (R) 0 15 17362372(r)
T123 11 20442 User 26630* Running 5 22 15100349(r)
T126 10 20441 User 28056* IOWait(R)(041) 0 17362372(r)
T127 16 20447 User 29139* IO Wait (R) 0 40 13705379(r)
T131 14 20445 User 28558* Semaphore Wait 0 17785567(d)
T135 16 20447 User 20574* IO Wait (R) 0 19 13705379(r)
T136 7 20438 User 27795* IOWait(R)(041) 0 19535885(s)
T146 9 20440 User 29062* IO Wait (R) 0 21 22136285(r)
T151 15 20446 User 21045* IO Wait (R) 0 41 17173861(s)
T154 9 20440 User 29068* IO Wait (R) 0 28 22136285(r)
T164 12 20443 User 23832* Semaphore Wait 0 15624900(r)
T166 16 20447 User 21231* IO Wait (R) 0 21 13705379(r)
Tables are not split.
Some question arise here for me:
- Why do we get so many "Semaphore Waits" although we are not accessing tables in parallel? Why do read operations have to be done atomically?
- Why do we get IOWait(R)(041)? Can it be so common that the same two pages are trying to be read twice? Those (041) occur, if I keep x_cons running, in half of the UKTs.
Markus
Hi,
Nearly all tasks with the status "Semaphore Wait" run in threads being active for other tasks::
- T86 8 20439 User 29601* Semaphore Wait 0 19929257(d),
Aktive task in thread 8: T114 8 20439 User 29435**Enter ExclLock 1 0 18 19929257(d)
- T93 13 20444 User 29737* Semaphore Wait 0 18315751(d)
T87 13 20444 User 29765* Semaphore Wait 0 18315751(d)
Active task in thread 13: T107 13 20444 User 26750**Enter ExclLock 1 0 18 18315751(d)
- T96 11 20442 User 27767* Semaphore Wait 0 15100349(r)
Active task in thread 11: T123 11 20442 User 26630* Running 5 22 15100349(r)
- T131 14 20445 User 28558* Semaphore Wait 0 17785567(d)
Active task in thread 14: T110 14 20445 User 29476**Enter ExclLock 1 0 66 17785567(d)
- T164 12 20443 User 23832* Semaphore Wait 0 15624900(r)
Active task in thread 12: T82 12 20443 User 29455* Running 10 67 15624900(r)
Only thread 7 is not scheduled on CPU.
Nevertheless there was a bottleneck on the reagions 18 and 66 at this particular time of the x_cons run. The database might need more data cache stripes (parameter DataCacheStripes).
The status "IOWait(R)(041)" can mean the tasks are waiting for I/O pre-fetching. The system views IOJOBS and the x_cons command SHOW IOPENDING give information about the running I/O orders.
Best regards,
Werner Thesing
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34 MB iTunes
Virtual Memory Information: ℹ️
30 MB Free RAM
784 MB Active RAM
772 MB Inactive RAM
1.01 GB Wired RAM
35.87 GB Page-ins
158 MB Page-outs
Diagnostics Information: ℹ️
Dec 21, 2014, 04:58:57 PM Self test - passedYou have two of the three worst ever applications written running on your mac, MacKeeper and CleanMyMac. Uninstall those two apps and your mac will run like new again.
http://macpaw.com/support/cleanmymac/knowledgebase/how-to-uninstall-cleanmymac-2
http://applehelpwriter.com/2011/09/21/how-to-uninstall-mackeeper-malware/ -
Lots of waiting... Mid 2010 Mac Mini
I've got a new Mac Mini, with 2.4GHZ and 8 Gig of ram.... I spend lots and lots and lots of time waiting. Internet, saving files etc. It's a very clean machine without much on it, but really, it's a bit of a dog. The older Mac Mini was faster for many, many many tasks..... Any clue where to look?
BTW, using 5 gig N network was unusable, had to go back to 2.4. That helped with network hangups. I don't think any of the web stuff is the router, as I have an XP machine with no delays on the 5G N setup. But really, when I save a file in Numbers, I get delays that shouldn't be there. When I boot iTunes, it takes forever compared to the old machine.
If this is the future, I'm worried.....
MattI think you have to break down the perceived slowness into manageable pieces.
First off, 30 seconds for software update to check is normal. So let's eliminate that as an issue.
Second, if you are dealing with newly established hard drives, spotlight indexing can really slow the Mini down during the initial index.
Third, don't ignore the network as being a source of slowness. I would eliminate Wifi as an issue by using ethernet cable to connect to your router until you get the slowness sorted out.
If ethernet cable doesn't make things better, then you need to see if there is a DNS issue. Sometimes manually adding the OpenDNS servers clears things up.
Other times, turning off (or on) IPv6 improves network issues.
You don't say which version your old Mini was. But if you are running old PPC apps, that could also being injecting slowness.
Finally, if you have needed files mounted on remote volumes and there is a slowdown in your LAN or WAN (if mounted on iDisk, for example), this could block you Mini's performance.
Maybe you are looking for
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