Little research how rm -rf and tar kill server

[Artem Kuchin]

31.03.2015 19:42, Konstantin Belousov пишет:
> Syncer and sync(2) perform different kind of syncs. Take the snapshot of
> sysctl debug.softdep before and after the situation occur to have some
> hints what is going on.
>
>

Okay. Here is the sysctl  data

start fro normal operations

see 1_normal.txt (sysctl executed momentarily)

then start untar and wait for about 3 minutes when sql queries start to 
build up (from usual 20 idle connection
to 70 queries) in 'opening table' state and number of http and perl 
processes rise

see 2_during.txt (sysctl executed 1 minute to show data)

now CTRL-C the untar and wait 60  seconds,
the number of queries increase more and more , number of processes 
slowly rise too, situation
cannot fix itself and becomes worse with time

see 3_after.txt (sysctl executed 1 minute to show data)

Now i did sync from shell (takes several seconds)
sql query queue immediately becomes empty, number of processes momentarily
drops almost to normal

see 4_after_sync.txt (sysctl executed momentarily)

Hope this clarifies something.

Artem

-------------- next part --------------
debug.softdep.total.pagedep: 450815
debug.softdep.total.inodedep: 2057986
debug.softdep.total.bmsafemap: 1643440
debug.softdep.total.newblk: 6861020
debug.softdep.total.allocdirect: 2747092
debug.softdep.total.indirdep: 28330
debug.softdep.total.allocindir: 4113928
debug.softdep.total.freefrag: 504393
debug.softdep.total.freeblks: 1300916
debug.softdep.total.freefile: 1244188
debug.softdep.total.diradd: 1704738
debug.softdep.total.mkdir: 679656
debug.softdep.total.dirrem: 1411511
debug.softdep.total.newdirblk: 340829
debug.softdep.total.freework: 1534540
debug.softdep.total.freedep: 4740
debug.softdep.total.jaddref: 2384394
debug.softdep.total.jremref: 1804487
debug.softdep.total.jmvref: 2713
debug.softdep.total.jnewblk: 6861020
debug.softdep.total.jfreeblk: 0
debug.softdep.total.jfreefrag: 504393
debug.softdep.total.jseg: 258774
debug.softdep.total.jsegdep: 11554294
debug.softdep.total.sbdep: 5437
debug.softdep.total.jtrunc: 0
debug.softdep.total.jfsync: 0
debug.softdep.highuse.pagedep: 43744
debug.softdep.highuse.inodedep: 129930
debug.softdep.highuse.bmsafemap: 866
debug.softdep.highuse.newblk: 4
debug.softdep.highuse.allocdirect: 43751
debug.softdep.highuse.indirdep: 544
debug.softdep.highuse.allocindir: 86553
debug.softdep.highuse.freefrag: 501
debug.softdep.highuse.freeblks: 129622
debug.softdep.highuse.freefile: 118234
debug.softdep.highuse.diradd: 110141
debug.softdep.highuse.mkdir: 140620
debug.softdep.highuse.dirrem: 86738
debug.softdep.highuse.newdirblk: 43739
debug.softdep.highuse.freework: 129640
debug.softdep.highuse.freedep: 902
debug.softdep.highuse.jaddref: 28040
debug.softdep.highuse.jremref: 2921
debug.softdep.highuse.jmvref: 393
debug.softdep.highuse.jnewblk: 9358
debug.softdep.highuse.jfreeblk: 0
debug.softdep.highuse.jfreefrag: 14
debug.softdep.highuse.jseg: 13633
debug.softdep.highuse.jsegdep: 149182
debug.softdep.highuse.sbdep: 1
debug.softdep.highuse.jtrunc: 0
debug.softdep.highuse.jfsync: 0
debug.softdep.current.pagedep: 19
debug.softdep.current.inodedep: 731
debug.softdep.current.bmsafemap: 26
debug.softdep.current.newblk: 0
debug.softdep.current.allocdirect: 29
debug.softdep.current.indirdep: 6
debug.softdep.current.allocindir: 28
debug.softdep.current.freefrag: 6
debug.softdep.current.freeblks: 30
debug.softdep.current.freefile: 1
debug.softdep.current.diradd: 15
debug.softdep.current.mkdir: 0
debug.softdep.current.dirrem: 14
debug.softdep.current.newdirblk: 0
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debug.softdep.current.freedep: 1
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debug.softdep.current.jremref: 0
debug.softdep.current.jmvref: 0
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debug.softdep.current.jsegdep: 165
debug.softdep.current.sbdep: 0
debug.softdep.current.jtrunc: 0
debug.softdep.current.jfsync: 0
debug.softdep.write.pagedep: 451335
debug.softdep.write.inodedep: 2202365
debug.softdep.write.bmsafemap: 194364
debug.softdep.write.newblk: 0
debug.softdep.write.allocdirect: 957173
debug.softdep.write.indirdep: 36669
debug.softdep.write.allocindir: 4076840
debug.softdep.write.freefrag: 0
debug.softdep.write.freeblks: 400530
debug.softdep.write.freefile: 0
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debug.softdep.write.jremref: 0
debug.softdep.write.jmvref: 0
debug.softdep.write.jnewblk: 0
debug.softdep.write.jfreeblk: 0
debug.softdep.write.jfreefrag: 0
debug.softdep.write.jseg: 258714
debug.softdep.write.jsegdep: 33764
debug.softdep.write.sbdep: 5438
debug.softdep.write.jtrunc: 0
debug.softdep.write.jfsync: 0
debug.softdep.max_softdeps: 2486412
debug.softdep.tickdelay: 2
debug.softdep.flush_threads: 1
debug.softdep.worklist_push: 0
debug.softdep.blk_limit_push: 0
debug.softdep.ino_limit_push: 0
debug.softdep.blk_limit_hit: 0
debug.softdep.ino_limit_hit: 0
debug.softdep.sync_limit_hit: 1136
debug.softdep.indir_blk_ptrs: 11229
debug.softdep.inode_bitmap: 35308
debug.softdep.direct_blk_ptrs: 46553
debug.softdep.dir_entry: 20915
debug.softdep.jaddref_rollback: 31626
debug.softdep.jnewblk_rollback: 72747
debug.softdep.journal_low: 22546
debug.softdep.journal_min: 0
debug.softdep.journal_wait: 47528
debug.softdep.jwait_filepage: 18646
debug.softdep.jwait_freeblks: 0
debug.softdep.jwait_inode: 24778
debug.softdep.jwait_newblk: 4104
debug.softdep.cleanup_blkrequests: 0
debug.softdep.cleanup_inorequests: 0
debug.softdep.cleanup_high_delay: 0
debug.softdep.cleanup_retries: 0
debug.softdep.cleanup_failures: 0
debug.softdep.flushcache: 0
debug.softdep.emptyjblocks: 0
debug.softdep.print_threads: 0
-------------- next part --------------
debug.softdep.total.pagedep: 779163
debug.softdep.total.inodedep: 2389227
debug.softdep.total.bmsafemap: 1973594
debug.softdep.total.newblk: 7191570
debug.softdep.total.allocdirect: 3077407
debug.softdep.total.indirdep: 28415
debug.softdep.total.allocindir: 4114163
debug.softdep.total.freefrag: 505771
debug.softdep.total.freeblks: 1303240
debug.softdep.total.freefile: 1247037
debug.softdep.total.diradd: 2034447
debug.softdep.total.mkdir: 1333270
debug.softdep.total.dirrem: 1414343
debug.softdep.total.newdirblk: 668355
debug.softdep.total.freework: 1537006
debug.softdep.total.freedep: 4745
debug.softdep.total.jaddref: 3367732
debug.softdep.total.jremref: 1807338
debug.softdep.total.jmvref: 2717
debug.softdep.total.jnewblk: 7191594
debug.softdep.total.jfreeblk: 0
debug.softdep.total.jfreefrag: 505773
debug.softdep.total.jseg: 262170
debug.softdep.total.jsegdep: 12872452
debug.softdep.total.sbdep: 5453
debug.softdep.total.jtrunc: 0
debug.softdep.total.jfsync: 0
debug.softdep.highuse.pagedep: 70216
debug.softdep.highuse.inodedep: 133633
debug.softdep.highuse.bmsafemap: 866
debug.softdep.highuse.newblk: 4
debug.softdep.highuse.allocdirect: 70222
debug.softdep.highuse.indirdep: 544
debug.softdep.highuse.allocindir: 86553
debug.softdep.highuse.freefrag: 501
debug.softdep.highuse.freeblks: 129622
debug.softdep.highuse.freefile: 118234
debug.softdep.highuse.diradd: 133491
debug.softdep.highuse.mkdir: 182210
debug.softdep.highuse.dirrem: 86738
debug.softdep.highuse.newdirblk: 70210
debug.softdep.highuse.freework: 129640
debug.softdep.highuse.freedep: 902
debug.softdep.highuse.jaddref: 40772
debug.softdep.highuse.jremref: 2921
debug.softdep.highuse.jmvref: 393
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debug.softdep.current.allocindir: 0
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debug.softdep.current.jfsync: 0
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debug.softdep.write.inodedep: 2625116
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debug.softdep.write.indirdep: 36857
debug.softdep.write.allocindir: 4077080
debug.softdep.write.freefrag: 0
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debug.softdep.write.freefile: 0
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debug.softdep.write.jsegdep: 34358
debug.softdep.write.sbdep: 5454
debug.softdep.write.jtrunc: 0
debug.softdep.write.jfsync: 0
debug.softdep.max_softdeps: 2486412
debug.softdep.tickdelay: 2
debug.softdep.flush_threads: 1
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debug.softdep.blk_limit_push: 0
debug.softdep.ino_limit_push: 0
debug.softdep.blk_limit_hit: 0
debug.softdep.ino_limit_hit: 0
debug.softdep.sync_limit_hit: 2388
debug.softdep.indir_blk_ptrs: 11345
debug.softdep.inode_bitmap: 38918
debug.softdep.direct_blk_ptrs: 55812
debug.softdep.dir_entry: 24407
debug.softdep.jaddref_rollback: 48407
debug.softdep.jnewblk_rollback: 85405
debug.softdep.journal_low: 38453
debug.softdep.journal_min: 0
debug.softdep.journal_wait: 48493
debug.softdep.jwait_filepage: 18935
debug.softdep.jwait_freeblks: 0
debug.softdep.jwait_inode: 25105
debug.softdep.jwait_newblk: 4461
debug.softdep.cleanup_blkrequests: 0
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debug.softdep.cleanup_high_delay: 0
debug.softdep.cleanup_retries: 0
debug.softdep.cleanup_failures: 0
debug.softdep.flushcache: 0
debug.softdep.emptyjblocks: 0
debug.softdep.print_threads: 0
-------------- next part --------------
debug.softdep.total.pagedep: 779819
debug.softdep.total.inodedep: 2390351
debug.softdep.total.bmsafemap: 1974305
debug.softdep.total.newblk: 7191979
debug.softdep.total.allocdirect: 3077801
debug.softdep.total.indirdep: 28433
debug.softdep.total.allocindir: 4114181
debug.softdep.total.freefrag: 505830
debug.softdep.total.freeblks: 1303445
debug.softdep.total.freefile: 1247282
debug.softdep.total.diradd: 2034791
debug.softdep.total.mkdir: 1333312
debug.softdep.total.dirrem: 1414636
debug.softdep.total.newdirblk: 668375
debug.softdep.total.freework: 1537216
debug.softdep.total.freedep: 4745
debug.softdep.total.jaddref: 3368107
debug.softdep.total.jremref: 1807626
debug.softdep.total.jmvref: 2717
debug.softdep.total.jnewblk: 7191998
debug.softdep.total.jfreeblk: 0
debug.softdep.total.jfreefrag: 505835
debug.softdep.total.jseg: 262755
debug.softdep.total.jsegdep: 12873590
debug.softdep.total.sbdep: 5453
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debug.softdep.total.jfsync: 0
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debug.softdep.highuse.inodedep: 133633
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debug.softdep.highuse.allocdirect: 70222
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debug.softdep.highuse.allocindir: 86553
debug.softdep.highuse.freefrag: 501
debug.softdep.highuse.freeblks: 129622
debug.softdep.highuse.freefile: 118234
debug.softdep.highuse.diradd: 133491
debug.softdep.highuse.mkdir: 182210
debug.softdep.highuse.dirrem: 86738
debug.softdep.highuse.newdirblk: 70210
debug.softdep.highuse.freework: 129640
debug.softdep.highuse.freedep: 902
debug.softdep.highuse.jaddref: 40772
debug.softdep.highuse.jremref: 2921
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debug.softdep.highuse.jnewblk: 13621
debug.softdep.highuse.jfreeblk: 0
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debug.softdep.highuse.jfsync: 0
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debug.softdep.current.indirdep: 0
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debug.softdep.current.jremref: 0
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debug.softdep.current.jfreeblk: 0
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debug.softdep.current.sbdep: 0
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debug.softdep.current.jfsync: 0
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debug.softdep.write.inodedep: 2631087
debug.softdep.write.bmsafemap: 208423
debug.softdep.write.newblk: 0
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debug.softdep.write.indirdep: 36945
debug.softdep.write.allocindir: 4077099
debug.softdep.write.freefrag: 0
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debug.softdep.write.jsegdep: 34611
debug.softdep.write.sbdep: 5456
debug.softdep.write.jtrunc: 0
debug.softdep.write.jfsync: 0
debug.softdep.max_softdeps: 2486412
debug.softdep.tickdelay: 2
debug.softdep.flush_threads: 1
debug.softdep.worklist_push: 0
debug.softdep.blk_limit_push: 0
debug.softdep.ino_limit_push: 0
debug.softdep.blk_limit_hit: 0
debug.softdep.ino_limit_hit: 0
debug.softdep.sync_limit_hit: 2973
debug.softdep.indir_blk_ptrs: 11400
debug.softdep.inode_bitmap: 39849
debug.softdep.direct_blk_ptrs: 58227
debug.softdep.dir_entry: 24529
debug.softdep.jaddref_rollback: 50497
debug.softdep.jnewblk_rollback: 86203
debug.softdep.journal_low: 45662
debug.softdep.journal_min: 0
debug.softdep.journal_wait: 48940
debug.softdep.jwait_filepage: 19079
debug.softdep.jwait_freeblks: 0
debug.softdep.jwait_inode: 25253
debug.softdep.jwait_newblk: 4609
debug.softdep.cleanup_blkrequests: 0
debug.softdep.cleanup_inorequests: 0
debug.softdep.cleanup_high_delay: 0
debug.softdep.cleanup_retries: 0
debug.softdep.cleanup_failures: 0
debug.softdep.flushcache: 0
debug.softdep.emptyjblocks: 0
debug.softdep.print_threads: 0
-------------- next part --------------
debug.softdep.total.pagedep: 780250
debug.softdep.total.inodedep: 2391614
debug.softdep.total.bmsafemap: 1975152
debug.softdep.total.newblk: 7193175
debug.softdep.total.allocdirect: 3078971
debug.softdep.total.indirdep: 28450
debug.softdep.total.allocindir: 4114204
debug.softdep.total.freefrag: 506112
debug.softdep.total.freeblks: 1304037
debug.softdep.total.freefile: 1247903
debug.softdep.total.diradd: 2035419
debug.softdep.total.mkdir: 1333314
debug.softdep.total.dirrem: 1415336
debug.softdep.total.newdirblk: 668376
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debug.softdep.total.jremref: 1808324
debug.softdep.total.jmvref: 2717
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debug.softdep.total.jfreeblk: 0
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debug.softdep.total.sbdep: 5457
debug.softdep.total.jtrunc: 0
debug.softdep.total.jfsync: 0
debug.softdep.highuse.pagedep: 70216
debug.softdep.highuse.inodedep: 133633
debug.softdep.highuse.bmsafemap: 866
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debug.softdep.highuse.allocdirect: 70222
debug.softdep.highuse.indirdep: 544
debug.softdep.highuse.allocindir: 86553
debug.softdep.highuse.freefrag: 501
debug.softdep.highuse.freeblks: 129622
debug.softdep.highuse.freefile: 118234
debug.softdep.highuse.diradd: 133491
debug.softdep.highuse.mkdir: 182210
debug.softdep.highuse.dirrem: 86738
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debug.softdep.highuse.freework: 129640
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debug.softdep.highuse.jremref: 2921
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debug.softdep.current.jfsync: 0
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debug.softdep.write.indirdep: 36966
debug.softdep.write.allocindir: 4077111
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debug.softdep.write.sbdep: 5458
debug.softdep.write.jtrunc: 0
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debug.softdep.max_softdeps: 2486412
debug.softdep.tickdelay: 2
debug.softdep.flush_threads: 1
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debug.softdep.blk_limit_push: 0
debug.softdep.ino_limit_push: 0
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debug.softdep.journal_low: 46780
debug.softdep.journal_min: 0
debug.softdep.journal_wait: 49010
debug.softdep.jwait_filepage: 19100
debug.softdep.jwait_freeblks: 0
debug.softdep.jwait_inode: 25281
debug.softdep.jwait_newblk: 4629
debug.softdep.cleanup_blkrequests: 0
debug.softdep.cleanup_inorequests: 0
debug.softdep.cleanup_high_delay: 0
debug.softdep.cleanup_retries: 0
debug.softdep.cleanup_failures: 0
debug.softdep.flushcache: 0
debug.softdep.emptyjblocks: 0
debug.softdep.print_threads: 0