How do I optimize lighttpd and resolve issue constant 100% CPU usage?

My top command shows result like:

top - 08:14:16 up 21:21,  1 user,  load average: 12.31, 6.23, 3.41
Tasks:  26 total,  11 running,  15 sleeping,   0 stopped,   0 zombie
Cpu(s): 18.4%us, 77.4%sy,  0.0%ni,  4.2%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
Mem:   2097152k total,    28096k used,  2069056k free,        0k buffers
Swap:        0k total,        0k used,        0k free,        0k cached

77.4%sy - it looks more like a broken driver
On the other hand on VPS ublike a normal computer  you might be given only CPU time you require, so you always use 100% of CPU assigned to you

If you feel there is a problem after explanation:

could you post your boot messages
 dmesg (with MACs and names replaced with 00:00's and aaa's)
and root processes which use CPU including kernel threads
ps axwwU root | grep -v 0:00
and representative memory usage data
vmstat 5 5
and information about active drivers and their operational stats
cat /proc/meminfo /proc/interrupts /proc/modules
and list of connected devices
sudo /sbin/lspci

77.4%sy can just be the result of an errant program making far too many system calls. top should show you the program using most CPU - that will be it. What does top show in that regard?

here's a new snapshot of top command

top - 13:22:18 up 1 day,  2:29,  1 user,  load average: 2.04, 3.24, 2.43
Tasks:  27 total,   3 running,  24 sleeping,   0 stopped,   0 zombie
Cpu(s):  2.7%us, 12.2%sy,  0.0%ni, 85.1%id,  0.0%wa,  0.0%hi,  0.0%si,  0.0%st
Mem:   2097152k total,    49268k used,  2047884k free,        0k buffers

basically lighttpd is using up most resource, another of my server running apache where httpd cpu is only at 0.0~0.3%, and server workload between 0.03 to 0.05 range.

9360 lighttpd  25   0 60116 1896  576 R 36.8  0.1   3:05.95 lighttpd
9362 lighttpd  18   0 60256 2096  576 R 36.5  0.1   6:15.78 lighttpd
9361 lighttpd  18   0 60240 2040  576 R 36.2  0.1   2:16.14 lighttpd
9363 lighttpd  15   0 60364 2236  576 R 25.7  0.1   6:53.35 lighttpd

i'm not sure the bottleneck issue is caused by cpu or lighttpd tunine.

lighttpd supposed to be fast and use little resources.

and web content serving is slow when the workload spike during my peak usage hours.

here are some captured result:

ps axwwU root | grep -v 0:00
  PID TTY      STAT   TIME COMMAND
    1 ?        Ss     0:03 init [3]        
 9239 ?        Rs     0:07 sshd: root@pts/0
 9347 ?        S      0:03 /usr/sbin/lighttpd -f /etc/lighttpd/lighttpd.conf
 9349 ?        S      0:09 /usr/sbin/lighttpd -f /etc/lighttpd/lighttpd.conf
 9351 ?        S      0:02 /usr/sbin/lighttpd -f /etc/lighttpd/lighttpd.conf
 9352 ?        S      0:09 /usr/sbin/lighttpd -f /etc/lighttpd/lighttpd.conf
 9353 ?        S      0:07 /usr/sbin/lighttpd -f /etc/lighttpd/lighttpd.conf
 9354 ?        S      0:02 /usr/sbin/lighttpd -f /etc/lighttpd/lighttpd.conf
 9355 ?        S      0:06 /usr/sbin/lighttpd -f /etc/lighttpd/lighttpd.conf
 9356 ?        S      0:26 /usr/sbin/lighttpd -f /etc/lighttpd/lighttpd.conf
 9357 ?        S      1:18 /usr/sbin/lighttpd -f /etc/lighttpd/lighttpd.conf
 9358 ?        S      1:28 /usr/sbin/lighttpd -f /etc/lighttpd/lighttpd.conf
 9359 ?        S      1:00 /usr/sbin/lighttpd -f /etc/lighttpd/lighttpd.conf
 9360 ?        R      3:35 /usr/sbin/lighttpd -f /etc/lighttpd/lighttpd.conf
 9361 ?        S      2:48 /usr/sbin/lighttpd -f /etc/lighttpd/lighttpd.conf
 9362 ?        R      7:03 /usr/sbin/lighttpd -f /etc/lighttpd/lighttpd.conf
 9363 ?        R      7:53 /usr/sbin/lighttpd -f /etc/lighttpd/lighttpd.conf

vmstat 5 5
procs -----------memory---------- ---swap-- -----io---- --system-- -----cpu------
 r  b   swpd   free   buff  cache   si   so    bi    bo   in   cs us sy id wa st
 1  0      0 2047676      0      0    0    0     0     1    0    4  1  4 95  0  0
 1  0      0 2047676      0      0    0    0     0     0    0 30145  3 12 85  0  0
 0  0      0 2047676      0      0    0    0     0     0    0 27576  3 11 86  0  0
 0  0      0 2047676      0      0    0    0     0     0    0 27994  0  0 100  0  0
 1  0      0 2047676      0      0    0    0     0    12    0 27101  2  9 89  0  0

cat /proc/meminfo /proc/interrupts /proc/modules
MemTotal:      2097152 kB
MemFree:       2047664 kB
Buffers:             0 kB
Cached:              0 kB
SwapCached:          0 kB
Active:              0 kB
Inactive:            0 kB
HighTotal:           0 kB
HighFree:            0 kB
LowTotal:      2097152 kB
LowFree:       2047664 kB
SwapTotal:           0 kB
SwapFree:            0 kB
Dirty:               0 kB
Writeback:           0 kB
AnonPages:           0 kB
Mapped:              0 kB
Slab:                0 kB
PageTables:          0 kB
NFS_Unstable:        0 kB
Bounce:              0 kB
CommitLimit:         0 kB
Committed_AS:        0 kB
VmallocTotal:        0 kB
VmallocUsed:         0 kB
VmallocChunk:        0 kB
HugePages_Total:     0
HugePages_Free:      0
HugePages_Rsvd:      0
Hugepagesize:     2048 kB
cat: /proc/interrupts: No such file or directory

or could it possibly even be bandwidth cap restriction that's slowing down the content server and create a traffic backlog?

You have virtual system and no control over the host. it could happen somebody else on the same host maxes out and you get oppressed.

could you give missing pieces and lighttpd conf file?
they have 20 event handlers and 20 file rad mechanisms and it could happen that you use unlucky combination.
http://redmine.lighttpd.net/wiki/lighttpd/Docs:ConfigurationOptions

could you run ab or http_load with 100 concurrent connections with 10000 requests and try to browse in parrallel?
if you succeed i would fingerpoint to your provider.

performance related setting for lighttpd.conf is here:

server.event-handler = "linux-sysepoll"
server.network-backend = "linux-sendfile"
server.max-fds = 2048
server.stat-cache-engine = "simple"
server.max-connections = 1024
server.max-worker = 16
server.max-keep-alive-idle = 4
server.max-keep-alive-requests = 4
server.max-read-idle = 10
server.max-write-idle = 700

by the way, i also got lot of no buffer space available message when using yum and trying using wget to download the httpd_load archive.

is there something wrong with the network connectivity or saturation?

once i stopped the lighhttpd, everything is fine again.

when i was doing the http_load test, i got a page full of no buffer space available messages as well.

i temporarily renamed my web content folder and doing a test on a html file with one line of text. following is what i got.

http_load -parallel 100 -fetches 10000  urls
http://xxx.xxx.xxx.xxx/: No buffer space available
http://xxx.xxx.xxx.xxx/: No buffer space available
http://xxx.xxx.xxx.xxx/: No buffer space available
http://xxx.xxx.xxx.xxx/: No buffer space available
http://xxx.xxx.xxx.xxx/: No buffer space available
http://xxx.xxx.xxx.xxx/: timed out
http://xxx.xxx.xxx.xxx/: timed out
http://xxx.xxx.xxx.xxx/: timed out
http://xxx.xxx.xxx.xxx/: timed out
http://xxx.xxx.xxx.xxx/: timed out
10000 fetches, 100 max parallel, 150000 bytes, in 60.8505 seconds
15 mean bytes/connection
164.337 fetches/sec, 2465.06 bytes/sec
msecs/connect: 0.374135 mean, 7.287 max, 0.031 min
msecs/first-response: 2.80844 mean, 29.639 max, 0.422 min
5 timeouts
HTTP response codes:
  code 200 -- 10000


i tried putting in content to the html file, and following is the result, even with lots of errors, i monitor using top command at the same time, there's no significant workload issue this time.


http_load -parallel 100 -fetches 10000  urls

http://xxx.xxx.xxx.xxx/: No buffer space available
http://xxx.xxx.xxx.xxx/: No buffer space available
http://xxx.xxx.xxx.xxx/: No buffer space available
http://xxx.xxx.xxx.xxx/: No buffer space available
http://xxx.xxx.xxx.xxx/: No buffer space available
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10000 fetches, 95 max parallel, 8.68e+06 bytes, in 61.0249 seconds
868 mean bytes/connection
163.868 fetches/sec, 142237 bytes/sec
msecs/connect: 0.337065 mean, 6.756 max, 0.031 min
msecs/first-response: 8.80362 mean, 208.165 max, 0.149 min
801 timeouts
HTTP response codes:
  code 200 -- 10000

you have a problem on a client machine where you do run the benchmark.
ulimit -n 100000
or so resolves.

currently when i type in ulimit, it shows "unlimited".

do i need to change that to 100000?

what does ulimit do?

also, is it a permanent change?  will it reset after reboot?

after execution of:

ulimit -n 100000

i re-run the test, still gets:

no buffer space available and timed out warnings.

10000 fetches, 92 max parallel, 150000 bytes, in 60.9697 seconds
15 mean bytes/connection
164.016 fetches/sec, 2460.24 bytes/sec
msecs/connect: 0.395608 mean, 5.849 max, 0.026 min
msecs/first-response: 2.79276 mean, 203.545 max, 0.399 min
140 timeouts
HTTP response codes:
  code 200 -- 10000

$ ulimit -n
64

shows between 64 and 1024 depending on your distribution.
ab is recycling sockets quickly and may run hig above 100 files open.

now i type:

ulimit -n

and it shows: 100000

originally it was at 1024

if i change it to 64, the command: http_load -parallel 100 -fetches 10000  urls

won't even execute with warning: http_load: parallel may be at most 61

what should i do now?

msecs/connect: 0.395608 mean, 5.849 max, 0.026 min

Can you run benchmark across localhost ? if it is fast and good the failure is outside your system.

https://gettys.wordpress.com/2010/12/06/whose-house-is-of-glasse-must-not-throw-stones-at-another/
https://gettys.wordpress.com/2010/12/03/introducing-the-criminal-mastermind-bufferbloat/

(so far best net) Diagnostic tool: http://netalyzr.icsi.berkeley.edu/l=en (run on server and client to validate environment)

My hosting provider suggested issuing the following command:

cat /proc/user_beancounters

Suggestion was for me to pay more and upgrade the service, which I don't think is the only way.

Seems that the "held" is pretty closed to the limit.  especially for:

numtcpsock
tcpsndbuf
tcprcvbuf

What are some of the ways for me to tweak this?

[root@server]# cat /proc/user_beancounters
Version: 2.5
       uid  resource                     held              maxheld              barrier                limit              failcnt
 10008171:  kmemsize                  9249974             21949548             49029120             54476800                    0
            lockedpages                     0                    0                  344                  344                    0
            privvmpages                 16981                63293               524288               550502                    0
            shmpages                     1281                 1617                32768                32768                    0
            dummy                           0                    0  9223372036854775807  9223372036854775807                    0
            numproc                        31                   45                  256                  256                    0
            physpages                   10307                42282                    0  9223372036854775807                    0
            vmguarpages                     0                    0               262144  9223372036854775807                    0
            oomguarpages                10308                42282               262144  9223372036854775807                    0
            numtcpsock                    280                  288                  288                  288               105316
            numflock                        1                    5                  224                  246                    0
            numpty                          2                    3                   32                   32                    0
            numsiginfo                      0                   33                  512                  512                    0
            tcpsndbuf                 2452392              2857040              2449232              3598712          26547562388
            tcprcvbuf                  347736              2456424              2449232              3598712                   32
            othersockbuf                 9312                21144               744366              1481926                    0
            dgramrcvbuf                     0                13128               844366               844366                    0
            numothersock                    9                   16                  288                  288                    0
            dcachesize                 831954              1025388              7299072              8110080                    0
            numfile                      2202                 2959                 6000                 6000                    0
            dummy                           0                    0                    0                    0                    0
            dummy                           0                    0                    0                    0                    0
            dummy                           0                    0                    0                    0                    0
            numiptent                      10                   10                   96                   96                    0

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it is related to your VPS, it is something NOT in common Linux machine.

ifconfig eth0 txqueuelen 16 (as bufferbloat articles suggest)

do you get any warnings in dmesg when a performance problem occurs?

there's no eth0 for me, i used:

ifconfig venet0 txqueuelen 16

returns nothing, and no error too.

dmesg shows nothing too.

/var/log/dmesg is at 0 file size

Now redo the benchmark with one of bloat buffers reduced...
ok do 50 connections since 100 seem to kill your client setup....

originally txqueuelen was 0, what does changing it to 16 do?

does it affect performance to the visitors?

i confirm with hosting provider that upgrading to a different package does increase tcpsndbuf settings in my user_beancounters.  is this the only option to go?

result with 50 and 100 as of the following:

10000 fetches, 50 max parallel, 0 bytes, in 60.6707 seconds
0 mean bytes/connection
164.824 fetches/sec, 0 bytes/sec
msecs/connect: 0.29837 mean, 5.186 max, 0.031 min
msecs/first-response: 2.30524 mean, 14.607 max, 0.421 min
2 timeouts
HTTP response codes:
  code 200 -- 10000


10000 fetches, 100 max parallel, 0 bytes, in 61.0871 seconds
0 mean bytes/connection
163.701 fetches/sec, 0 bytes/sec
msecs/connect: 0.373422 mean, 5.375 max, 0.036 min
msecs/first-response: 3.26923 mean, 603.194 max, 0.437 min
154 timeouts
HTTP response codes:
  code 200 -- 9996

also is this changing in txqueuelen permanent?  if i reboot the server, is it going back to 0?

server.max-worker adjustment seems to help.

i think it ended up be the resource restriction to my service package.

there's nothing much i can do about it.  even though it's only serving static content, but the resource limitation is giving it a cap.

You can check your content with yslow and pagespeed - expect 10% drop in data volume by plainly optimizing content + 20% more if compressing html (but that costs CPU time if compressing PHP content)

I would say that it was hard to figure that you are outscaling webserver and at the same time exceeding subscription. Now that you know how to scale webserver up you have the idea how to optimize your subscription.
Good luck, and sure feel free to ask here, and help people with their overloaded websites ;)

Thanks for the extra info.

I'll look into that in checking the loading speed.

The one with high CPU usage was my media content delivering server.

My actual static html content is on another server where there's CPU resource readily available.

Regarding to compressing html, is it something configured within the webserver?  something like gzip?

Does it compress each served html on the fly?  or from the cache?  And gets decompressed at the user's browser?

This will be something I'll look into.

Yes yes - it is gzip...
I dont know about lighttpd, it could be named deflate or gzip.
In Apache or IIS you can select which types to compress on the fly.

For inspiration with static content at no CPU usage: http://serverfault.com/questions/78469/apache-send-pre-packed-gziped-files

I do have Apache used for serving my static html files.

The link you provided is pretty cool, have you tried that yourself?

If I were only to gzip the html once, does it have to be done outside of Apache or still used the mod_gzip?

Compressing the same content over and over again indeed is a waste of CPU resource, serving a cached copies of the gzipped content makes sense.

By the way, do you know if it's a good idea to even gzip and serve the static media content such as images and have them cached?  This makes more sense to me as my media content doesn't change often.

I would have optimized the media content, but some of them are dynamically acquired and I have no control of it at the first place.  I would also like to keep the original quality to the end user.

Yes, i used it with apache 1.3 serving bloaty PDFs

I'll definitely give that a try, thanks.

.zip compression aka deflate from 7-zip makes even smaller files, you can use advdef from advancecomp package to improve gzip result for ~5% (based on my PDF experience)
would not it be nice that you make a story on web content optimization for server admins in web server areas?

i'm not good a writing up reports :)

i'm going for the mod_deflate solution, as my servers for serving html are old in terms of both operating system and apache.

it's still stable and can managed to serve good amount of traffic. i just want to get more out of it.

there's really a lot of website optimization techniques out there.

advdef is definitely cool, but i don't have much .png content to serve.  and my servers are old with limited cpu resources.  i don't want to spend too much on compression time.

advdef can compress static pre-gzipped files better than gzip (the rewrite solution)

i'll try that on my other server serving static media content, does it use a lot of resources?

i might be thinking about using nginx for serving static media content, can advdef work with it and support jpeg?

is it a replacement for mod_gzip and mod_deflate?