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Old 07-28-2009, 05:01 AM   #1
moimel
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Help | High waiting I/O (%wa)


I have high %wa in the top which is the waiting IO or whatever,

I can't find any info on how to scan for the processes that consume it,

any way this is my top:

top - 18:58:01 up 20:05, 1 user, load average: 15.21, 16.36, 15.72
Tasks: 306 total, 18 running, 288 sleeping, 0 stopped, 0 zombie
Cpu(s): 16.7%us, 2.8%sy, 0.0%ni, 43.8%id, 35.9%wa, 0.1%hi, 0.7%si, 0.0%st
Mem: 4138236k total, 3961636k used, 176600k free, 2248k buffers
Swap: 18808816k total, 11966424k used, 6842392k free, 127800k cached

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
1214 meron 15 0 275m 33m 2304 R 11.9 0.8 15:02.58 srcds_i686
22199 yuval 15 0 306m 69m 2648 S 10.9 1.7 19:45.31 srcds_i686
11597 benkia 15 0 233m 20m 1352 R 6.6 0.5 4:47.40 srcds_i686
237 root 10 -5 0 0 0 R 5.6 0.0 7:18.12 kswapd0
5882 dormaor 15 0 138m 26m 3068 S 4.3 0.7 23:15.54 hlds_i686
24112 oren258 15 0 129m 71m 3308 R 4.0 1.8 7:37.56 hlds_i686
13199 oz14789 15 0 153m 29m 3064 R 3.3 0.7 17:05.94 hlds_i686
5916 dormaor 15 0 128m 15m 2952 S 2.7 0.4 8:25.90 hlds_i686
1702 emi1121 15 0 126m 10m 2704 R 2.0 0.3 13:40.35 hlds_i686
3505 devilhen 15 0 139m 11m 2688 S 2.0 0.3 13:30.50 hlds_i686
4956 oren258 15 0 1534m 19m 2960 S 2.0 0.5 7:11.25 hlds_i686
4034 liormich 18 0 142m 51m 3268 D 1.7 1.3 16:11.55 hlds_i686
4241 adir2612 15 0 81064 5516 2232 S 1.0 0.1 7:24.12 hlds_i686
4541 champion 15 0 219m 4896 900 S 1.0 0.1 37:08.12 srcds_i686
9906 adir2612 15 0 94168 8596 2464 S 1.0 0.2 46:25.03 hlds_i686
12456 omri1213 15 0 117m 4828 2316 R 1.0 0.1 33:47.80 hlds_i686
13358 doron 15 0 110m 5092 2148 S 1.0 0.1 5:21.02 hlds_i686
2900 afekio 15 0 215m 9644 920 S 0.7 0.2 7:26.85 srcds_i686
3380 devilhen 15 0 111m 51m 2648 S 0.7 1.3 6:47.65 hlds_i686
3402 devilhen 15 0 110m 3280 1408 R 0.7 0.1 5:21.14 hlds_i686
3504 devilhen 15 0 106m 4288 1496 S 0.7 0.1 7:18.31 hlds_i686
3653 oz14789 15 0 1529m 8500 1688 S 0.7 0.2 7:24.48 hlds_i686
3673 oz14789 15 0 119m 17m 2392 S 0.7 0.4 13:03.49 hlds_i686
6068 adamste 15 0 82660 3764 2400 R 0.7 0.1 10:30.22 hlds_i686
6411 boomday 15 0 211m 9856 964 S 0.7 0.2 8:29.73 srcds_i686
6425 vrstop 15 0 115m 5492 2332 S 0.7 0.1 7:58.03 hlds_i686
10093 adir2612 15 0 93356 4532 2592 R 0.7 0.1 10:35.20 hlds_i686
11642 wiliam 15 0 256m 6188 1148 S 0.7 0.1 9:06.76 srcds_i686
12041 adir2612 15 0 98868 40m 3220 S 0.7 1.0 18:28.87 hlds_i686
12266 xapystyl 15 0 231m 7064 964 S 0.7 0.2 32:08.49 srcds_i686
12958 faintly 15 0 127m 7776 2788 R 0.7 0.2 8:40.29 hlds_i686
14282 oz14789 15 0 123m 11m 1928 R 0.7 0.3 8:13.15 hlds_i686
20176 amx321 15 0 1616m 118m 1608 R 0.7 2.9 1:42.29 hlds_i686
27981 devilhen 15 0 146m 6248 1684 S 0.7 0.2 27:24.39 hlds_i686
400 devilhen 15 0 84580 6280 1604 S 0.3 0.2 1:12.43 hlds_i686
1118 oren258 15 0 1525m 459m 2872 R 0.3 11.4 0:26.85 hlds_i686
3384 devilhen 15 0 99560 3256 1596 S 0.3 0.1 5:00.40 hlds_i686
3458 devilhen 15 0 99.9m 3772 1552 R 0.3 0.1 5:11.83 hlds_i686
3482 devilhen 15 0 136m 57m 2760 S 0.3 1.4 12:50.52 hlds_i686
3503 devilhen 15 0 99.1m 3364 1576 S 0.3 0.1 5:09.31 hlds_i686
3854 liormich 15 0 137m 10m 2396 S 0.3 0.3 18:27.05 hlds_i686
3996 oren258 15 0 110m 3308 1536 R 0.3 0.1 3:59.27 hlds_i686
5829 pingless 15 0 24780 2120 940 S 0.3 0.1 3:24.55 pingless4708
6301 devilhen 15 0 84816 4232 1564 S 0.3 0.1 1:10.20 hlds_i686
9046 devilhen 15 0 1492m 1.4g 3392 S 0.3 36.2 0:27.11 hlds_i686
10336 root 15 0 2328 1144 792 R 0.3 0.0 0:00.28 top
10538 mixer 15 0 20336 1880 1000 S 0.3 0.0 0:39.21 mixer5063
11345 oren258 15 0 1531m 904m 2240 S 0.3 22.4 2:20.06 hlds_i686
12145 khtcvnkl 15 0 24656 2092 908 S 0.3 0.1 2:50.79 khtcvnkll5015
12692 multiser 15 0 1496m 3524 1564 S 0.3 0.1 4:07.34 hlds_i686
12800 adir2612 15 0 65036 2576 1516 S 0.3 0.1 1:31.11 hlds_i686
15773 oz14789 15 0 152m 15m 1820 R 0.3 0.4 39:53.28 hlds_i686
19146 liormich 15 0 1521m 6356 1508 S 0.3 0.2 4:41.38 hlds_i686

I have CentOS 5 .

when the %wa is getting pretty high like 60%+ it's making the server laggy...

so i need to find way to check which proccesses are making this! thanks

Last edited by moimel; 07-28-2009 at 05:02 AM.
 
Old 07-28-2009, 06:15 AM   #2
zQUEz
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I always wanted to try this, but have never gotten around to it .... how about IO TOP: http://guichaz.free.fr/iotop/
 
Old 07-28-2009, 06:37 AM   #3
syg00
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You need to investigate the I/O profile - try the sysstat package. How much I/O spread over how many disks - where is the swap space; is it competing on the same disks as the general I/O ?.
Lots to look at.
 
Old 07-28-2009, 06:46 AM   #4
moimel
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I have one disk,

and the swap space including extra swap space I made (16GB) is from this disk. is it possible that his making the problem?

-bash-3.2# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/mapper/VolGroup00-LogVol00
451G 102G 326G 24% /
/dev/sda1 99M 63M 32M 67% /boot
tmpfs 2.0G 0 2.0G 0% /dev/shm

I used the sysstat thing and iostats with it:
-bash-3.2# iostat
Linux 2.6.18-128.2.1.el5PAE (server6.pingless.co.il) 07/28/2009

avg-cpu: %user %nice %system %iowait %steal %idle
22.96 0.03 12.66 20.23 0.00 44.13

Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn
sda 29.16 469.11 294.23 37110052 23275716
sda1 0.00 0.03 0.00 2266 20
sda2 29.16 469.08 294.23 37107514 23275696
sdb 111.10 2535.26 2016.93 200558402 159554808
sdb1 111.10 2535.26 2016.93 200558130 159554808
dm-0 437.80 2642.44 2029.84 209037098 160575432
dm-1 80.40 361.88 281.33 28627784 22255072


I have no idea what is it means!

Last edited by moimel; 07-28-2009 at 06:52 AM.
 
Old 07-28-2009, 10:51 AM   #5
moimel
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Help

Another log:

top - 00:48:47 up 1 day, 1:56, 1 user, load average: 23.51, 23.21, 22.03
Tasks: 324 total, 7 running, 317 sleeping, 0 stopped, 0 zombie
Cpu(s): 7.4%us, 2.6%sy, 0.0%ni, 30.2%id, 59.2%wa, 0.0%hi, 0.6%si, 0.0%st
Mem: 4138236k total, 3966932k used, 171304k free, 576k buffers
Swap: 18808816k total, 8176976k used, 10631840k free, 84920k cached

PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
5882 dormaor 15 0 166m 32m 3012 S 5.3 0.8 44:42.34 hlds_i686
3854 liormich 15 0 173m 32m 2888 R 4.9 0.8 40:07.08 hlds_i686
25275 liormich 15 0 108m 34m 3060 S 3.0 0.9 3:43.81 hlds_i686
6155 adir2612 16 0 69516 57m 7148 D 2.0 1.4 0:01.80 hlds_i686
22102 devilhen 18 0 1532m 431m 3128 D 1.6 10.7 3:18.32 hlds_i686
6787 yuval 15 0 274m 9464 1632 S 1.0 0.2 3:55.20 srcds_i686
4541 champion 15 0 219m 4892 848 S 0.7 0.1 40:37.09 srcds_i686
4956 oren258 17 0 138m 43m 3104 D 0.7 1.1 18:28.79 hlds_i686
6726 root 15 0 2328 1116 756 R 0.7 0.0 0:00.23 top
7396 oz14789 15 0 138m 25m 3412 S 0.7 0.6 4:58.71 hlds_i686
9600 oren258 15 0 1535m 1.1g 4304 S 0.7 28.2 5:45.78 hlds_i686
9906 adir2612 15 0 94168 6684 2832 S 0.7 0.2 54:35.23 hlds_i686
11642 wiliam 15 0 256m 7300 1072 S 0.7 0.2 14:42.54 srcds_i686
400 devilhen 15 0 84580 4256 1584 S 0.3 0.1 4:05.25 hlds_i686
530 liormich 15 0 1505m 1.4g 3380 S 0.3 35.1 0:42.87 hlds_i686
1214 meron 15 0 284m 8888 1464 S 0.3 0.2 25:24.45 srcds_i686
3380 devilhen 15 0 111m 40m 2448 S 0.3 1.0 10:13.51 hlds_i686
3384 devilhen 15 0 99824 3072 1520 S 0.3 0.1 8:00.98 hlds_i686
3402 devilhen 15 0 111m 5620 1896 S 0.3 0.1 8:12.89 hlds_i686
3458 devilhen 15 0 99.9m 5564 1912 S 0.3 0.1 7:53.86 hlds_i686
3653 oz14789 15 0 1539m 5988 1724 S 0.3 0.1 10:53.96 hlds_i686
3837 liormich 15 0 116m 6044 1560 S 0.3 0.1 7:24.82 hlds_i686
6064 adir2612 15 0 4488 1192 976 S 0.3 0.0 0:00.02 hlds_run
6301 devilhen 15 0 84816 4216 1564 S 0.3 0.1 4:05.23 hlds_i686
6411 boomday 15 0 211m 7576 1048 S 0.3 0.2 12:31.73 srcds_i686
9223 adir2612 15 0 75352 9172 2628 S 0.3 0.2 3:40.23 hlds_i686
11673 oz14789 15 0 114m 21m 3252 S 0.3 0.5 3:09.01 hlds_i686
11834 xapystyl 15 0 222m 15m 1032 S 0.3 0.4 2:14.39 srcds_i686
12164 omri1213 15 0 119m 10m 2544 S 0.3 0.3 3:01.40 hlds_i686
12320 benkia 15 0 201m 8188 1332 S 0.3 0.2 0:45.23 srcds_i686
12692 multiser 15 0 1496m 3752 1632 S 0.3 0.1 6:05.41 hlds_i686
15773 oz14789 15 0 159m 12m 2148 S 0.3 0.3 53:18.03 hlds_i686
19080 khtcvnkl 15 0 77816 2732 1392 S 0.3 0.1 2:16.71 hlds_i686
22327 liormich 15 0 112m 52m 3196 R 0.3 1.3 5:16.42 hlds_i686
24117 devilhen 15 0 101m 10m 2508 S 0.3 0.3 1:38.63 hlds_i686
25834 faintly 15 0 146m 9928 2692 S 0.3 0.2 7:42.57 hlds_i686
27981 devilhen 15 0 156m 59m 2876 S 0.3 1.5 49:51.39 hlds_i686
30321 oz14789 15 0 89756 8868 3420 R 0.3 0.2 0:13.76 hlds_i686
31350 devilhen 15 0 117m 53m 2904 S 0.3 1.3 2:02.69 hlds_i686
1 root 15 0 2064 496 468 S 0.0 0.0 0:02.07 init
2 root RT -5 0 0 0 S 0.0 0.0 0:00.02 migration/0
3 root 34 19 0 0 0 S 0.0 0.0 0:00.01 ksoftirqd/0
4 root RT -5 0 0 0 S 0.0 0.0 0:00.00 watchdog/0
5 root RT -5 0 0 0 S 0.0 0.0 0:00.04 migration/1
6 root 34 19 0 0 0 S 0.0 0.0 0:00.02 ksoftirqd/1
7 root RT -5 0 0 0 S 0.0 0.0 0:00.00 watchdog/1
8 root RT -5 0 0 0 S 0.0 0.0 0:00.03 migration/2
9 root 34 19 0 0 0 S 0.0 0.0 0:00.15 ksoftirqd/2
10 root RT -5 0 0 0 S 0.0 0.0 0:00.00 watchdog/2
11 root RT -5 0 0 0 S 0.0 0.0 0:00.02 migration/3
12 root 34 19 0 0 0 S 0.0 0.0 0:00.00 ksoftirqd/3
13 root RT -5 0 0 0 S 0.0 0.0 0:00.00 watchdog/3
14 root 10 -5 0 0 0 S 0.0 0.0 0:00.08 events/0

It's like the %wa is rising for a second and the %cpu is going down weird....
 
Old 07-28-2009, 03:05 PM   #6
salasi
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You have posted several things which have suggested that IO Wait is on the high side, no question about that. The trouble is that just presenting another log with more evidence that IO Wait can be on the high side won't get anyone close to understanding in more depth so that we can do more than sympathise.

The output from iotop would give information about which process is doing it, which would probably be helpful (although it is a bit difficult to watch and needs some patience).

The other approach is to start from the 'is it swapping because something is using up too much memory?' (and 'is it swapping?' is a question inside that, and that is not yet answered.)

vmstat helps (but ignore the first result), combined with top or you could try looking at ksysguard. If any process looks to be running out of control, then you have to ask why, as that can take you further.

BTW, your posts are hard to read, because the column formatting is falling all over the place. If you use code tags, this doesn't usually happen.
 
Old 07-28-2009, 03:30 PM   #7
Tinkster
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Quote:
Code:
Mem: 4138236k total, 3961636k used, 176600k free, 2248k buffers
Swap: 18808816k total, 11966424k used, 6842392k free, 127800k cached
Code:
Mem: 4138236k total, 3966932k used, 171304k free, 576k buffers
Swap: 18808816k total, 8176976k used, 10631840k free, 84920k cached
You have just about three times and double the amount
of RAM swapped out.
The machine is memory starved, and the I/O wait is almost
certainly caused by swapping/paging. Get more RAM (or put
less stuff on the box).



Cheers,
Tink

Last edited by Tinkster; 07-28-2009 at 03:32 PM.
 
Old 07-28-2009, 06:48 PM   #8
moimel
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I don't think it has somthing with the servers load in the box,

I rebooted it, and run all server, and it seemes like it's connected to the kswapd0 process thing, every time I see it in the top the server getting laggy and the %wa is ascending.

I decreased the swap from 16GB to 8GB, I though it might fix the problem but with no luck.



I saw a lot of problems in google with kswapd0 high cpu, I think that's might be my problem.

Any Idea how to solve it?


I HAVE:
Linux version 2.6.18-128.2.1.el5PAE (mockbuild@builder16.centos.org) (gcc version 4.1.2 20080704 (Red Hat 4.1.2-44)) #1 SMP Tue Jul 14 07:15:01 EDT 2009

CentOS release 5.3 (Final)

2.6.18-128.2.1.el5PAE i686
 
Old 07-28-2009, 06:55 PM   #9
Tinkster
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Hello again...

Mate ... with 4GB of RAM and 8GB swapped out ... what do you think
why swapd might be active and your I/O subsystem busy?



Quote:
Any Idea how to solve it?
Of course. Buy more RAM. Or reduce the number of concurrent memory
hungry processes.

I mean ... with one process eating (almost) half your RAM by itself...
Code:
3653 oz14789 15 0 1539m 5988 1724 S 0.3 0.1 10:53.96 hlds_i686
What are you expecting? Linux *is* awesome, and does miracles with RAM.
Just not without it.
Do another top, sort by memory usage, post it in code tags.


Cheers,
Tink
 
Old 07-28-2009, 07:14 PM   #10
wabbalee
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I am just posting here to follow this thread, as I have some similar i/o problems that I have been unable to fix over the years. the difference between my problem and what is discussed here is that my system randomly goes to 99% wait for less then a minute and then gets back to normal again. I wanted to place a link to a recent thread or post I did but I can't find the thread, have to go to work now.

good luck
Ron
 
Old 07-29-2009, 04:39 AM   #11
moimel
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Look at this log:

PHP Code:
top 19:31:23 up 14 days22:06,  4 users,  load average25.9918.5316.39
Tasks
304 total,   5 running299 sleeping,   0 stopped,   0 zombie
Cpu
(s):  7.0%us,  1.6%sy,  0.0%ni,  8.5%id82.6%wa,  0.1%hi,  0.3%si,  0.0%st
Mem
:   4147960k total,  3994800k used,   153160k free,      720k buffers
Swap
:  8323056k total,  2960276k used,  5362780k free,   126712k cached

  PID USER      PR  NI  VIRT  RES  SHR S 
%CPU %MEM    TIME+  COMMAND
19033 mark      15   0  141m  77m 5416 S   10  1.9   4
:51.93 hlds_i686
12111 chenimen  15   0  142m  61m 3356 S    3  1.5  16
:49.19 hlds_i686
12404 oz14789   18   0 1478m 670m 2812 D    2 16.6   0
:05.59 hlds_i686
 9472 oz14789   15   0  136m  44m 3684 R    2  1.1  74
:03.87 hlds_i686
 6302 bazzerse  15   0  142m  84m 4424 S    2  2.1  24
:01.63 hlds_i686
16790 morsabag  15   0  132m  71m 3576 S    2  1.8  19
:16.59 hlds_i686
 1339 mark      16   0  300m  34m 3736 D    1  0.9 101
:00.33 srcds_i486
  227 root      10  
-5     0    0    0 D    1  0.0  36:35.64 kswapd0
13034 Samesh    15   0 43552 1784  732 S    1  0.0 203
:55.59 Samesh4804
22017 oz14789   15   0  124m  60m 6260 R    1  1.5  90
:07.19 hlds_i686
 4062 igamer    15   0  103m  40m 3668 R    1  1.0  16
:14.10 hlds_i686
 4725 recon     15   0  277m  47m 2500 S    1  1.2 154
:52.56 srcds_i686
 5284 etai71    15   0  102m 6296 3008 S    1  0.2  81
:33.75 hlds_i686
 7875 david     18   0 15912  13m 1984 D    1  0.3   0
:09.12 steam
14420 atrexser  15   0  107m  49m 5256 D    1  1.2   4
:51.08 hlds_i686
14960 maor      15   0  128m 4404 2316 S    1  0.1  57
:44.80 hlds_i686
18734 etai71    15   0  132m 8620 2468 S    1  0.2  52
:21.84 hlds_i686
 4358 oz14789   15   0  131m 6232 2104 S    0  0.2 209
:02.55 hlds_i686
 4969 asafl95s  15   0  252m  73m 6488 S    0  1.8  26
:52.27 srcds_i486
 6847 oz14789   16   0  166m  90m 4168 D    0  2.2 101
:42.13 hlds_i686
 6848 roni1993  15   0 79976  14m 2748 S    0  0.4  12
:07.38 hlds_i686
 9383 shay      15   0  104m  41m 2972 S    0  1.0 117
:03.31 hlds_i686
11827 lari1212  15   0  356m  54m 1200 S    0  1.3 144
:22.33 srcds_i686
12791 edenzzz   15   0 81420  15m 3696 S    0  0.4  10
:07.66 hlds_i686
13273 root      15   0  2320 1132  788 R    0  0.0   0
:00.11 top
16674 firetwis  15   0  194m  36m 2616 S    0  0.9 412
:10.59 hlds_i686
17262 erezelia  15   0  303m  53m 5400 S    0  1.3  15
:55.39 srcds_i686
18265 topserv   15   0 91164  22m 3432 S    0  0.6   7
:44.10 hlds_i686
18529 gon1      15   0  222m  23m 1184 S    0  0.6  97
:20.21 srcds_i686
18627 atrexser  15   0  152m  42m 2596 S    0  1.1  42
:13.49 hlds_i686
20321 igamer    16   0 60648  25m 1548 D    0  0.6  57
:55.06 igamer4845
22436 gal       15   0  204m 7528 1572 S    0  0.2 185
:30.19 hlds_i686
22592 crelby    15   0  276m  70m 7812 S    0  1.7  11
:26.92 srcds_i686
27078 morsabag  15   0  129m  55m 3124 R    0  1.4  46
:32.46 hlds_i686
27816 etai71    15   0 83512 4092 2160 S    0  0.1  72
:39.98 hlds_i686
30380 kaparov   16   0 83808  60m 5480 D    0  1.5   0
:21.72 hlds_i686
31210 atrexser  15   0  113m  11m 4596 S    0  0.3   0
:24.86 hlds_i686
31754 techg9    15   0 19064 3092 1444 S    0  0.1   0
:30.01 techg94823
    1 root      15   0  2064  168  136 S    0  0.0   0
:05.50 init
    2 root      RT   0     0    0    0 S    0  0.0   0
:00.52 migration/0
    3 root      34  19     0    0    0 S    0  0.0   0
:03.01 ksoftirqd/0
    4 root      RT   0     0    0    0 S    0  0.0   0
:00.00 watchdog/0
    5 root      RT   0     0    0    0 S    0  0.0   0
:00.53 migration/1
    6 root      34  19     0    0    0 S    0  0.0   0
:00.76 ksoftirqd/1
    7 root      RT   0     0    0    0 S    0  0.0   0
:00.00 watchdog/1
    8 root      RT   0     0    0    0 S    0  0.0   0
:00.49 migration/2
    9 root      34  19     0    0    0 S    0  0.0   0
:00.83 ksoftirqd/2
   10 root      RT   0     0    0    0 S    0  0.0   0
:00.00 watchdog/2
   11 root      RT   0     0    0    0 S    0  0.0   0
:00.46 migration/3
   12 root      34  19     0    0    0 S    0  0.0   0
:00.74 ksoftirqd/3
   13 root      RT   0     0    0    0 S    0  0.0   0
:00.00 watchdog/3
   14 root      10  
-5     0    0    0 S    0  0.0   0:00.06 events/0
   15 root      10  
-5     0    0    0 S    0  0.0   0:00.05 events/
The IO is high, note there is 720K buffers and 153160K free mem.

so basically what's you recommend is to add memory? I believe the cpu is ok because the overload is more of a memory problem, am I correct?


I am asking my supplier to increase mem to 6GB and i'll increase the swap to 12GB.

just give me your opinion.

and a question : what exactly the VIRT column is means? how much memory was used by the process or how much is using atm ?

Update: I killed all those processes have VIRT of 1500m~ and my memory:
Mem: 4147960k total, 1345740k used, 2802220k free, 8716k buffers
buffers freed, more free memory
and %wa stabilized:
Cpu(s): 18.6%us, 1.4%sy, 0.0%ni, 77.2%id, 2.5%wa, 0.0%hi, 0.2%si, 0.0%st

so I can say that the memory consumers made it. I might not need to add memory after all.

steel want your opinion

THANKS

Last edited by moimel; 07-29-2009 at 05:01 AM.
 
Old 07-29-2009, 08:44 AM   #12
wabbalee
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Registered: Oct 2006
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http://ubuntuforums.org/showthread.php?t=1221176

I found the other thread but no fix, not sure if I should create a new thread for this on here.
 
  


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