-1

Repeatedly facing mysqld out of memory. Lots of PHP processes spawned, taking up all the swap.

[562074.326710] mysqld invoked oom-killer: gfp_mask=0x201da, order=0, oom_adj=0, oom_score_adj=0
[562074.329646] mysqld cpuset=/ mems_allowed=0
[562074.330882] Pid: 21351, comm: mysqld Not tainted 2.6.32-642.1.1.el6.x86_64 #1
[562074.333171] Call Trace:
[562074.334870]  [] ? dump_header+0x90/0x1b0
[562074.336812]  [] ? security_real_capable_noaudit+0x3c/0x70
[562074.338692]  [] ? oom_kill_process+0x82/0x2a0
[562074.340270]  [] ? select_bad_process+0xe1/0x120
[562074.341582]  [] ? out_of_memory+0x220/0x3c0
[562074.343229]  [] ? __alloc_pages_nodemask+0x93c/0x950
[562074.344930]  [] ? ext4_get_block+0x0/0x120 [ext4]
[562074.346436]  [] ? alloc_pages_current+0xaa/0x110
[562074.347604]  [] ? __page_cache_alloc+0x87/0x90
[562074.348889]  [] ? find_get_page+0x1e/0xa0
[562074.350660]  [] ? filemap_fault+0x1a7/0x500
[562074.352207]  [] ? __do_fault+0x54/0x530
[562074.353872]  [] ? handle_pte_fault+0xf7/0xb20
[562074.355966]  [] ? rwsem_down_failed_common+0x95/0x1d0
[562074.357531]  [] ? rwsem_down_read_failed+0x26/0x30
[562074.359503]  [] ? handle_mm_fault+0x299/0x3d0
[562074.361105]  [] ? call_rwsem_down_read_failed+0x14/0x30
[562074.362522]  [] ? __do_page_fault+0x146/0x500
[562074.364590]  [] ? lock_sock_nested+0xac/0xc0
[562074.387996]  [] ? _spin_unlock_bh+0x1b/0x20
[562074.389187]  [] ? pvclock_clocksource_read+0x58/0xd0
[562074.390457]  [] ? kvm_clock_read+0x1c/0x20
[562074.391586]  [] ? kvm_clock_get_cycles+0x9/0x10
[562074.392673]  [] ? getnstimeofday+0x58/0xf0
[562074.394697]  [] ? do_page_fault+0x3e/0xa0
[562074.395974]  [] ? page_fault+0x25/0x30
[562074.397218] Mem-Info:
[562074.399103] Node 0 DMA per-cpu:
[562074.400605] CPU    0: hi:    0, btch:   1 usd:   0
[562074.402129] CPU    1: hi:    0, btch:   1 usd:   0
[562074.403506] Node 0 DMA32 per-cpu:
[562074.405629] CPU    0: hi:  186, btch:  31 usd:   0
[562074.406749] CPU    1: hi:  186, btch:  31 usd:  30
[562074.407914] Node 0 Normal per-cpu:
[562074.409325] CPU    0: hi:  186, btch:  31 usd:   0
[562074.410787] CPU    1: hi:  186, btch:  31 usd:  30
[562074.411941] active_anon:717855 inactive_anon:182000 isolated_anon:5083
[562074.411943]  active_file:32 inactive_file:192 isolated_file:64
[562074.411944]  unevictable:0 dirty:0 writeback:259 unstable:0
[562074.411944]  free:21353 slab_reclaimable:5762 slab_unreclaimable:10906
[562074.411945]  mapped:63 shmem:43 pagetables:21560 bounce:0
[562074.418218] Node 0 DMA free:15724kB min:248kB low:308kB high:372kB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:15312kB mlocked:0kB dirty:0kB writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:0kB slab_unreclaimable:0kB kernel_stack:0kB pagetables:0kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? yes
[562074.424382] lowmem_reserve[]: 0 3512 4017 4017
[562074.426602] Node 0 DMA32 free:61060kB min:58868kB low:73584kB high:88300kB active_anon:2667432kB inactive_anon:524160kB active_file:4kB inactive_file:396kB unevictable:0kB isolated(anon):15980kB isolated(file):384kB present:3596500kB mlocked:0kB dirty:0kB writeback:560kB mapped:232kB shmem:172kB slab_reclaimable:15184kB slab_unreclaimable:17264kB kernel_stack:6736kB pagetables:66680kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:64 all_unreclaimable? no
[562074.432920] lowmem_reserve[]: 0 0 505 505
[562074.434773] Node 0 Normal free:8392kB min:8464kB low:10580kB high:12696kB active_anon:203604kB inactive_anon:203616kB active_file:124kB inactive_file:320kB unevictable:0kB isolated(anon):4992kB isolated(file):128kB present:517120kB mlocked:0kB dirty:0kB writeback:476kB mapped:20kB shmem:0kB slab_reclaimable:7864kB slab_unreclaimable:26360kB kernel_stack:6832kB pagetables:19560kB unstable:0kB bounce:0kB writeback_tmp:0kB pages_scanned:32 all_unreclaimable? no
[562074.441562] lowmem_reserve[]: 0 0 0 0
[562074.443251] Node 0 DMA: 3*4kB 0*8kB 0*16kB 1*32kB 1*64kB 0*128kB 1*256kB 0*512kB 1*1024kB 1*2048kB 3*4096kB = 15724kB
[562074.449972] Node 0 DMA32: 492*4kB 4530*8kB 511*16kB 140*32kB 89*64kB 3*128kB 1*256kB 1*512kB 1*1024kB 1*2048kB 0*4096kB = 60784kB
[562074.455851] Node 0 Normal: 1455*4kB 68*8kB 3*16kB 2*32kB 0*64kB 1*128kB 1*256kB 1*512kB 1*1024kB 0*2048kB 0*4096kB = 8396kB
[562074.461844] 22462 total pagecache pages
[562074.463320] 21989 pages in swap cache
[562074.464571] Swap cache stats: add 34726956, delete 34704967, find 25405257/28809084
[562074.466666] Free swap  = 0kB
[562074.467793] Total swap = 4194252kB
[562074.508867] 1048575 pages RAM
[562074.510066] 67960 pages reserved
[562074.511918] 7658 pages shared
[562074.513082] 947230 pages non-shared
[562074.514178] [ pid ]   uid  tgid total_vm      rss cpu oom_adj oom_score_adj name
[562074.516236] [  490]     0   490     2680        0   1     -17         -1000 udevd
[562074.518561] [  790]     0   790     2662        0   1     -17         -1000 udevd
[562074.520752] [ 1342]     0  1342    62368       50   1       0             0 rsyslogd
[562074.522842] [ 1357]     0  1357     4563       23   0       0             0 irqbalance
[562074.525130] [ 1376]    25  1376    59678      129   0       0             0 named
[562074.527174] [ 1394]    81  1394     5359        1   0       0             0 dbus-daemon
[562074.529698] [ 1432]     0  1432     1020        0   0       0             0 acpid
[562074.532021] [ 1451]    28  1451   336791      177   0       0             0 nscd
[562074.534053] [ 1569]     0  1569    16086       24   1     -17         -1000 sshd
[562074.536171] [ 1580]    38  1580     6262       27   1       0             0 ntpd
[562074.539282] [ 2053]     0  2053     4662        1   0       0             0 dovecot
[562074.542072] [ 2065]   401  2065    10639        1   0       0             0 pop3-login
[562074.545036] [ 2066]   401  2066    10637        1   0       0             0 imap-login
[562074.547647] [ 2067]    97  2067     3368        1   0       0             0 anvil
[562074.550029] [ 2068]     0  2068     3401        1   1       0             0 log
[562074.552190] [ 2070]   401  2070    10655        1   0       0             0 pop3-login
[562074.554224] [ 2071]   401  2071    10670        1   0       0             0 imap-login
[562074.556886] [ 2072]     0  2072     3659        1   0       0             0 config
[562074.560112] [ 2082]    47  2082    18238        1   1       0             0 exim
[562074.562160] [ 2100]     0  2100    49742      335   1       0             0 /usr/local/cpan
[562074.564197] [ 2102]     0  2102    53119      223   0       0             0 spamd child
[562074.566209] [ 2129]     0  2129    45352        1   0       0             0 abrtd
[562074.568273] [ 2139]     0  2139    45197        1   0       0             0 abrt-dump-oops
[562074.570489] [ 2150]     0  2150    19189      124   0       0             0 httpd
[562074.572607] [ 2165]     0  2165    34191        0   0       0             0 pure-ftpd
[562074.574719] [ 2167]     0  2167    34036        1   0       0             0 pure-authd
[562074.577609] [ 2260]     0  2260    29271       27   1       0             0 crond
[562074.580212] [ 2275]     0  2275     4857        5   1       0             0 atd
[562074.582301] [ 2375]     0  2375    26952      125   0       0             0 cpsrvd (SSL) - 
[562074.584483] [ 2381]     0  2381     8172       69   0       0             0 queueprocd - wa
[562074.586500] [ 2391]     0  2391    27506       53   0       0             0 dnsadmin - serv
[562074.589509] [ 2419]     0  2419    20822      258   0       0             0 tailwatchd
[562074.592045] [ 2433]     0  2433    19586        1   0       0             0 cPhulkd - proce
[562074.594295] [ 2476]     0  2476    33028       60   0       0             0 cpdavd - accept
[562074.597210] [ 2512]     0  2512     5915      102   1       0             0 cpanellogd - sl
[562074.600503] [ 2540]     0  2540     1016        1   1       0             0 mingetty
[562074.603689] [ 2542]     0  2542     1016        1   0       0             0 mingetty
[562074.610302] [ 2545]     0  2545     1016        1   1       0             0 mingetty
[562074.615154] [ 2547]     0  2547     2679        0   0     -17         -1000 udevd
[562074.617989] [ 2548]     0  2548     1016        1   1       0             0 mingetty
[562074.622920] [ 2550]     0  2550     1016        1   1       0             0 mingetty
[562074.625853] [ 2552]     0  2552     1016        1   1       0             0 mingetty
[562074.628530] [30499]     0 30499   147473       23   0       0             0 clamd
[562074.631934] [ 8712]     0  8712     2394        1   1       0             0 mysqld_safe
[562074.634865] [ 9408]   402  9408   564397    42943   0       0             0 mysqld
[562074.637620] [24553]     0 24553    27283        1   1       0             0 sshd
[562074.641062] [24562]     0 24562    13893        1   0       0             0 sftp-server
[562074.643785] [25296]     0 25296    27283        1   1       0             0 sshd
[562074.646513] [25312]     0 25312    26649        1   0       0             0 bash
[562074.649571] [25954]    99 25954    19222       60   0       0             0 httpd
[562074.652579] [25955]     0 25955    19061        1   0       0             0 leechprotect
[562074.655407] [25958]    99 25958   334134      795   0       0             0 httpd
[562074.657912] [25959]    99 25959   334193      806   1       0             0 httpd
[562074.660551] [25960]    99 25960   334438      802   0       0             0 httpd
[562074.663110] [26044]    99 26044   334439      803   0       0             0 httpd
[562074.665618] [26206]    99 26206   334191      844   1       0             0 httpd
[562074.668698] [26361]    99 26361   334134      886   0       0             0 httpd
[562074.671241] [28324]     0 28324    27283        1   1       0             0 sshd
[562074.673759] [28333]     0 28333    26649        1   0       0             0 bash
[562074.676257] [28546]    99 28546   334167      821   0       0             0 httpd
[562074.702428] [ 1091]     0  1091    27283        1   1       0             0 sshd
[562074.704538] [ 1130]     0  1130    26649        1   0       0             0 bash
[562074.706652] [ 5276]   500  5276    77474     7801   1       0             0 php
[562074.708866] [ 5278]   500  5278    77582     7649   0       0             0 php
[562074.711662] [ 5281]   500  5281    77580     7259   1       0             0 php
[562074.714235] [ 5290]   500  5290    77601     7474   1       0             0 php
[562074.716490] [ 5295]   500  5295    77538     7540   1       0             0 php
[562074.718824] [ 5299]   500  5299    77414     7551   1       0             0 php
[562074.721384] [ 5302]   500  5302    77518     8104   1       0             0 php
[562074.724114] [ 5304]   500  5304    77414     7522   1       0             0 php
[562074.726653] [ 5308]   500  5308    77582     7241   0       0             0 php
[562074.729482] [ 5309]   500  5309    77542     7294   0       0             0 php
[562074.731758] [ 5367]   500  5367    79215     8223   0       0             0 php
[562074.734948] [ 5369]   500  5369    79230     7073   1       0             0 php
[562074.738000] [ 5389]   500  5389    74670     6863   1       0             0 php
[562074.740609] [ 5407]   500  5407    74996     5832   0       0             0 php
[562074.742809] [ 5415]   500  5415    75850     6233   1       0             0 php
[562074.745813] [ 5416]   500  5416    75061     5948   1       0             0 php
[562074.748265] [ 5418]   500  5418    74992     5796   1       0             0 php
[562074.750694] [ 5420]   500  5420    76190     7332   0       0             0 php
[562074.753004] [ 5430]   500  5430    74932     6113   1       0             0 php
[562074.755384] [ 5434]   500  5434    75460     6480   1       0             0 php
[562074.757639] [ 5439]   500  5439    74928     5879   1       0             0 php
[562074.761562] [ 5440]   500  5440    75125     5701   1       0             0 php
[562074.764306] [ 5442]   500  5442    75914     6693   1       0             0 php
[562074.766600] [ 5446]   500  5446    75214     5475   1       0             0 php
[562074.768955] [ 5448]   500  5448    74705     6309   1       0             0 php
[562074.771372] [ 5450]   500  5450    73976     6564   0       0             0 php
[562074.773778] [ 5451]   500  5451    73831     6459   1       0             0 php
[562074.776178] [ 5458]   500  5458    74611     7603   0       0             0 php
[562074.778666] [ 5459]   500  5459    75781     8240   1       0             0 php
[562074.781649] [ 5465]   500  5465    73772     7310   1       0             0 php
[562074.784412] [ 5470]   500  5470    74414     7797   1       0             0 php
[562074.788349] [ 5476]   500  5476    74864     8214   1       0             0 php
[562074.790625] [ 5480]   500  5480    73510     8366   0       0             0 php
[562074.793613] [ 5482]   500  5482    73708     8698   0       0             0 php
[562074.796689] [ 5492]   500  5492    72444    11027   1       0             0 php
[562074.799184] [ 5496]   500  5496    72784    12415   1       0             0 php
[562074.802301] [ 5499]   500  5499    73768    11388   0       0             0 php
[562074.804993] [ 5500]   500  5500    72582    11302   0       0             0 php
[562074.808597] [ 5503]   500  5503    70752     9687   0       0             0 php
[562074.810941] [ 5513]   500  5513    73447    10543   0       0             0 php
[562074.813474] [ 5519]   500  5519    72728    12005   1       0             0 php
[562074.815596] [ 5520]   500  5520    72710    11134   1       0             0 php
[562074.818435] [ 5523]   500  5523    72246    11313   0       0             0 php
[562074.821278] [ 5533]   500  5533    73576    12705   0       0             0 php
[562074.824227] [ 5536]   500  5536    70305    11674   1       0             0 php
[562074.826292] [ 5541]   500  5541    73378    13119   1       0             0 php
[562074.828638] [ 5545]   500  5545    69769    10932   1       0             0 php
[562074.831461] [ 5548]   500  5548    69382    10296   0       0             0 php
[562074.833803] [ 5549]   500  5549    73458    13978   1       0             0 php
[562074.836589] [ 5564]   500  5564    69708    11383   1       0             0 php
[562074.839962] [ 5568]   500  5568    69380    12267   0       0             0 php
[562074.842304] [ 5570]   500  5570    69580    13324   1       0             0 php
[562074.844533] [ 5574]   500  5574    69057    13993   0       0             0 php
[562074.847082] [ 5577]   500  5577    69450    13875   1       0             0 php
[562074.849309] [ 5578]   500  5578    70048    14829   1       0             0 php
[562074.851653] [ 5587]   500  5587    69514    15274   1       0             0 php
[562074.854140] [ 5589]   500  5589    69382    16196   1       0             0 php
[562074.856537] [ 5593]   500  5593    68012    14763   0       0             0 php
[562074.858820] [ 5597]   500  5597    71343    18344   0       0             0 php
[562074.861408] [ 5598]   500  5598    66115    12838   1       0             0 php
[562074.864285] [ 5603]   500  5603    69319    16732   1       0             0 php
[562074.866510] [ 5612]   500  5612    63573    11969   0       0             0 php
[562074.868753] [ 5613]   500  5613    61574     9964   1       0             0 php
[562074.871009] [ 5616]   500  5616    63637    12150   0       0             0 php
[562074.874032] [ 5624]   500  5624    63726    12707   1       0             0 php
[562074.876563] [ 5625]   500  5625    55276     4013   1       0             0 php
[562074.879156] [ 5630]   500  5630    52951     2211   0       0             0 php
[562074.881476] [ 5631]   500  5631    53736     3070   1       0             0 php
[562074.883968] [ 5633]   500  5633    53245     2474   0       0             0 php
[562074.886305] [ 5634]   500  5634    54533     3868   1       0             0 php
[562074.888585] [ 5635]   500  5635    54650     3839   0       0             0 php
[562074.890872] [ 5636]   500  5636    56802     6104   0       0             0 php
[562074.893228] [ 5637]   500  5637    54189     3375   1       0             0 php
[562074.895530] [ 5638]   500  5638    54563     3901   0       0             0 php
[562074.897784] [ 5639]   500  5639    52667     1958   1       0             0 php
[562074.900122] [ 5640]   500  5640    54533     3711   0       0             0 php
[562074.902475] [ 5641]   500  5641    52922     2197   0       0             0 php
[562074.904697] [ 5642]   500  5642    52667     1954   1       0             0 php
[562074.907013] [ 5643]   500  5643    52958     2226   0       0             0 php
[562074.909381] [ 5644]   500  5644    52667     1927   0       0             0 php
[562074.911628] [ 5645]   500  5645    54015     3402   1       0             0 php
[562074.913914] [ 5646]   500  5646    52951     2165   0       0             0 php
[562074.916614] [ 5647]   500  5647    54635     3863   1       0             0 php
[562074.919109] [ 5648]    99  5648   219408      400   1       0             0 httpd
[562074.921510] [ 5649]   500  5649    53928     3331   1       0             0 php
[562074.924011] [ 5650]   500  5650    56653     5958   0       0             0 php
[562074.926651] [ 5651]   500  5651    52951     2223   0       0             0 php
[562074.929157] [ 5652]   500  5652    52735     1997   1       0             0 php
[562074.954567] [ 5653]   500  5653    52457     1707   1       0             0 php
[562074.957251] [ 5654]    99  5654   235792      481   1       0             0 httpd
[562074.959480] [ 5660]   500  5660    53928     3321   0       0             0 php
[562074.961682] [ 5686]   500  5686    54417     3563   0       0             0 php
[562074.964573] [ 5712]   500  5712    52958     2216   0       0             0 php
[562074.966804] [ 5713]   500  5713    53887     3247   0       0             0 php
[562074.969044] [ 5714]   500  5714    52951     2206   0       0             0 php
[562074.971840] [ 5715]   500  5715    53736     3103   1       0             0 php
[562074.974827] [ 5716]   500  5716    52663     1938   1       0             0 php
[562074.977527] [ 5717]   500  5717    56118     5385   0       0             0 php
[562074.980867] [ 5726]   500  5726    57172     6396   1       0             0 php
[562074.984658] [ 5727]   500  5727    52523     1760   0       0             0 php
[562074.987267] [ 5728]   500  5728    52587     1869   1       0             0 php
[562074.989641] [ 5730]   500  5730    52430     1711   1       0             0 php
[562074.992423] [ 5731]   500  5731    53672     3061   0       0             0 php
[562074.995140] [ 5732]   500  5732    52587     1860   1       0             0 php
[562074.998136] [ 5733]   500  5733    52770     2016   0       0             0 php
[562075.002104] [ 5734]   500  5734    53216     2537   1       0             0 php
[562075.004987] [ 5735]   500  5735    54351     3615   1       0             0 php
[562075.007912] [ 5737]   500  5737    54329     3665   0       0             0 php
[562075.010646] [ 5738]   500  5738    53864     3231   1       0             0 php
[562075.013388] [ 5750]   500  5750    53992     3332   1       0             0 php
[562075.016259] [ 5751]   500  5751    53992     3356   1       0             0 php
[562075.018239] [ 5754]   500  5754    52457     1707   0       0             0 php
[562075.020361] [ 5755]   500  5755    53672     3008   0       0             0 php
[562075.022769] [ 5758]   500  5758    53928     3334   1       0             0 php
[562075.024717] [ 5759]   500  5759    53800     3153   0       0             0 php
[562075.026820] [ 5760]   500  5760    52457     1715   1       0             0 php
[562075.029743] [ 5761]   500  5761    53672     2999   1       0             0 php
[562075.031868] [ 5767]   500  5767    52430     1709   0       0             0 php
[562075.033922] [ 5768]   500  5768    53672     3015   1       0             0 php
[562075.035960] [ 5772]   500  5772    52457     1708   1       0             0 php
[562075.038017] [ 5774]   500  5774    53928     3307   0       0             0 php
[562075.040342] [ 5777]   500  5777    52430     1709   0       0             0 php
[562075.042585] [ 5780]   500  5780    52922     2200   1       0             0 php
[562075.044900] [ 5781]   500  5781    29874      419   0       0             0 php
[562075.046949] [ 5782]   500  5782    52430     1710   0       0             0 php
[562075.049163] [ 5787]   500  5787    53736     3111   0       0             0 php
[562075.051348] [ 5788]   500  5788    52428     1681   0       0             0 php
[562075.053411] [ 5789]   500  5789    16226       45   1       0             0 php
[562075.055455] [ 5790]   500  5790    53992     3361   0       0             0 php
[562075.057385] [ 5796]   500  5796    53800     3145   0       0             0 php
[562075.059354] [ 5802]   500  5802    51933     1164   0       0             0 php
[562075.061403] [ 5803]   500  5803    53736     3088   1       0             0 php
[562075.063319] [ 5828]   500  5828    52457     1712   1       0             0 php
[562075.065328] [ 5830]   500  5830    53992     3362   1       0             0 php
[562075.067304] [ 5833]   500  5833    52457     1711   0       0             0 php
[562075.069272] [ 5834]   500  5834    52457     1710   0       0             0 php
[562075.071342] [ 5838]   500  5838    25576       65   0       0             0 php
[562075.073811] [ 5839]    99  5839   121104      248   1       0             0 httpd
[562075.075876] [ 5848]    99  5848   121104      279   1       0             0 httpd
[562075.078224] [ 5849]   500  5849    29230      282   1       0             0 php
[562075.080532] [ 5850]   500  5850    29118      217   1       0             0 php
[562075.082861] [ 5851]   500  5851    53352     2643   0       0             0 php
[562075.084933] [ 5852]    99  5852   121104      281   1       0             0 httpd
[562075.087091] [ 5854]   500  5854    52430     1708   0       0             0 php
[562075.089180] [ 5856]   500  5856    51703      882   0       0             0 php
[562075.091154] [ 5863]    99  5863   121104      286   1       0             0 httpd
[562075.093112] [ 5970]   500  5970    28797      186   1       0             0 php
[562075.095140] [ 5986]     0  5986     5651       60   0       0             0 upcp-running
[562075.097396] [ 5988]   500  5988    29118      223   0       0             0 php
[562075.099621] [ 5991]    99  5991   104720      241   0       0             0 httpd
[562075.101929] [ 5993]   500  5993     3116       43   0       0             0 suphp
[562075.104055] [ 5994]   500  5994    29329      408   0       0             0 php
[562075.106361] [ 6026]   500  6026    29118      223   0       0             0 php
[562075.108660] [ 6027]   500  6027    29118      231   1       0             0 php
[562075.111327] [ 6028]   500  6028     7365       23   1       0             0 php
[562075.113563] [ 6032]    99  6032   121104      279   1       0             0 httpd
[562075.115682] Out of memory: Kill process 9408 (mysqld) score 44 or sacrifice child
[562075.117786] Killed process 9408, UID 402, (mysqld) total-vm:2257588kB, anon-rss:171860kB, file-rss:544kB

This occurs only once or twice in the day. Otherwise the load is well within limits (<2.00). The load reaches >100 when this error occurs. As per the access logs I wasn't getting more traffic when this happened. What should I do to fix this?

  • The question and subject are not connected – chutz Jul 2 '16 at 4:46
4

What should I do to fix this?

Add memory or reduce the load on memory from processes.


Install monitoring

Gather data.

Use Scientific Method to work out where the bottlenecks are.

Take appropriate action.

Repeat as required.

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