Mysql Server Hanging On A High Traffic Site

Feb 28, 2008

My video sharing site has high traffic, alexa rate:3,000

My site has 2 servers to split the load. 2 servers share a mysql server. Using rrdns to load the balance.

Server A running mysql 5.0,lighttpd
Server B running lighttpd.
Server B connect to A's mysql database.

During peak time. B can not connect to A's mysql server. It says server not responding. But A still running fine.
When I check mysql log file.
/usr/libexec/mysqld: Forcing close of thread .....

And when run top, the load average is 20.

The spec of Server A
Intel(R) Xeon(TM) CPU 3.06GHz dual core.
2G Ram.

Here is the my.cnf


# Default to using old password format for compatibility with mysql 3.x
# clients (those using the mysqlclient10 compatibility package).
max_connections = 1000

My question, do I need another maching C to run lighttpd, and just keep mysql on A.
Or I can do some mysql optimization on A.

Also, if my site keeps going, can I have 1 mysql server and 5 http servers?

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High Traffic Site On ASP.NET

Apr 18, 2009

We currently have a website for our client developed on with SQL

Its a straight forward web application with 2000 visitors per day

The traffic is going too heavy and its now at 130 GB per month

Our Queries :
Can we still have this site on a shared environment ?
If yes, suggest few providers offering high bandwidth

What other alternatives are there?

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We expect a site on one of our boxes to receive a significantly high level of traffic tomorrow as it is an event that will be covered and has already been covered by the press. The site operator expects > 100,000 hits a second.

It's a PHP page that pulls records from a database and lets people submit a form to insert a record. We have already put a caching script in place so that refreshing the page does not result in doing another database query.

The site was overloading a shared server, and we've moved it to one of our VPS boxes - it's the only VPS on the system at the moment. The box is a Quad Xeon 5410 with 4GB RAM with a 4 10K RPM drives in a RAID5 setup.

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CPU1: Intel Xeon 5310 Clovertown (Quad Core)
CPU2: Intel Xeon 5310 Clovertown (Quad Core)
Total CPU Cores: Eight (8)
System RAM: 6144MB (6GB) DDR2 ECC Registered System RAM
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Operating System: CentOS Enterprise Linux 5 64-Bit (x86_64)
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He posts about 5-10 blogs a day too, so it's definitely a growing community website. He also has a forum with 6500 posts and 389 members.

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Mar 12, 2008

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Recently got mod_evasive installed, but I didn't want it to block out legitimate users. Currently it's set to this...

<IfModule mod_evasive20.c>
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So, we need a really robust hosting, to work with PHP5 and MYSQL.

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An alternative is to get another server just for the videos being served and leave the database and html on the current server. This is where I'm stuck and don't know what route to take with this.

My current server stats:

Dual Xeon 5130
50 Mbit/sec
CentOS 3.9

Website traffic stats:

15,000 visitors/day
150,000 pageviews/day
Serving videos

I've attached screenshots of top and bandwidth usage per day. Hopefully with this information you could tell me if I need another server or if there are any things I can do to the current server to help things move faster.

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I currently use GoDaddy's dedicated server but I fear it may not be enough; here are my current specs:

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8 GB 667 MHz FB-DIMM Memory (Fully Buffered)
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I've already installed eAccelerator and tweaked everything, but it still hangs when spikes occur.

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We are running iptraf now, and it seems normal:
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I am not too knowledgeable with servers, but I believe that this is a problem. How much CPU usage is a mysqld command supposed to use on average? Here is a copy of the top part of a sample top command:


top - 06:54:50 up 92 days, 5:32, 1 user, load average: 3.82, 3.89, 4.24
Tasks: 181 total, 4 running, 176 sleeping, 0 stopped, 1 zombie
Cpu(s): 0.2%us, 18.6%sy, 80.9%ni, 0.0%id, 0.0%wa, 0.0%hi, 0.3%si, 0.0%st
Mem: 2075600k total, 1905400k used, 170200k free, 331912k buffers
Swap: 4096564k total, 104k used, 4096460k free, 1187304k cached

21663 mysql 24 6 63032 30m 3004 R 66 1.5 38:24.06 mysqld
28483 mysql 24 6 63032 30m 3004 R 66 1.5 35:52.86 mysqld
20538 mysql 22 6 63032 30m 3004 S 15 1.5 40:29.74 mysqld
20837 mysql 24 6 63032 30m 3004 R 15 1.5 13:44.15 mysqld
1209 mysql 22 6 63032 30m 3004 S 11 1.5 32:46.26 mysqld
20591 mysql 22 6 63032 30m 3004 S 11 1.5 40:02.76 mysqld
20592 mysql 23 6 63032 30m 3004 S 6 1.5 40:48.29 mysqld
15301 apache 19 4 29928 15m 3608 S 3 0.8 0:00.60 httpd
15317 apache 19 4 28380 14m 3640 S 3 0.7 0:00.58 httpd
15249 apache 19 4 28612 14m 3732 S 1 0.7 0:01.49 httpd
15349 apache 19 4 28876 14m 3324 S 1 0.7 0:00.10 httpd
15319 apache 19 4 28368 14m 3528 S 1 0.7 0:00.34 httpd
15334 apache 19 4 28612 14m 3404 S 1 0.7 0:00.35 httpd
12343 root 15 0 2324 1088 804 R 1 0.1 0:03.31 top
15336 apache 19 4 28876 14m 3500 S 0 0.7 0:00.63 httpd
1 root 15 0 2064 588 508 S 0 0.0 1:01.28 init
2 root RT -5 0 0 0 S 0 0.0 0:09.39 migration/0
3 root 34 19 0 0 0 S 0 0.0 0:01.25 ksoftirqd/0
4 root RT -5 0 0 0 S 0 0.0 0:00.00 watchdog/0

I told my system manager about the cpu problem, and he said that he installed the cpulimit function on my server. I'm not sure if this is a good solution.

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May 19, 2007

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this is logs that i found

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May 19 15:35:02 hostname kernel: eip: c02d331b
May 19 15:35:02 hostname kernel: ------------[ cut here ]------------
May 19 15:35:02 hostname kernel: kernel BUG at include/asm/spinlock.h:133!
May 19 15:35:02 hostname kernel: invalid operand: 0000 [#1]
May 19 15:35:02 hostname kernel: SMP
May 19 15:35:02 hostname kernel: Modules linked in: md5 ipv6 parport_pc lp
parport ipt_state ipt_TOS iptable_mangle ip_conntrack_ftp ip_conntrack_irc ip_c
onntrack ipt_REJECT ipt_LOG ipt_limit iptable_filter ipt_multiport ip_tables aut
ofs4 i2c_dev i2c_core sunrpc dm_mirror dm_mod button battery ac uhci_hcd ehci_hc
d snd_intel8x0 snd_ac97_codec snd_pcm_oss snd_mixer_oss snd_pcm snd_timer snd_pa
ge_alloc snd_mpu401_uart snd_rawmidi snd_seq_device snd soundcore 8139too mii sk
98lin ext3 jbd
May 19 15:35:02 hostname kernel: CPU: 1
May 19 15:35:02 hostname kernel: EIP: 0060:[<c02d357c>] Not tainted
May 19 15:35:02 hostname kernel: EFLAGS: 00010016 (2.6.9-42.0.10.ELsmp)
May 19 15:35:02 hostname kernel: EIP is at _spin_lock_irq+0x1d/0x35
May 19 15:35:02 hostname kernel: eax: c02e71c3 ebx: f5e6a934 ecx: c756be28 edx: c02d331b
May 19 15:35:02 hostname kernel: esi: f5e6a930 edi: 00000000 ebp: c756b000 esp: c756be2c
May 19 15:35:02 hostname kernel: ds: 007b es: 007b ss: 0068
May 19 15:35:02 hostname kernel: Process netstat (pid: 336, threadinfo=c756b000 task=cb03b330)
May 19 15:35:02 hostname kernel: Stack: ffffffff c02d331b cb03b330 f6481e98 f6481e98 00000246 00000002 f5e6a930
May 19 15:35:02 hostname kernel: f5e6a900 00000000 c756b000 c01652bf 00000000 00000000 00000000 c032e610
May 19 15:35:02 hostname kernel: c756bfc4 0000000b 0000000b c011d2e4 c014e529 ffffffff ffffffff c2015de0
May 19 15:35:02 hostname kernel: Call Trace:
May 19 15:35:02 hostname kernel: [<c02d331b>] rwsem_down_write_failed+0x32/0x160
May 19 15:35:02 hostname kernel: [<c01652bf>] .text.lock.exec+0xba/0xd7
May 19 15:35:02 hostname kernel: [<c011d2e4>] try_to_wake_up+0x28e/0x299
May 19 15:35:02 hostname kernel: [<c014e529>] do_no_page+0x2da/0x2f9
May 19 15:35:02 hostname kernel: [<c012b458>] __dequeue_signal+0x14c/0x155
May 19 15:35:02 hostname kernel: [<c012b476>] dequeue_signal+0x15/0x54
May 19 15:35:02 hostname kernel: [<c012cd3f>] get_signal_to_deliver+0x317/0x346
May 19 15:35:02 hostname kernel: [<c0105bd4>] do_signal+0x55/0xd9
May 19 15:35:02 hostname kernel: [<c01c3616>] __copy_to_user_ll+0x30/0x46
May 19 15:35:02 hostname kernel: [<c017553b>] seq_read+0x24a/0x2c2
May 19 15:35:02 hostname kernel: [<c0172c49>] dnotify_parent+0x1b/0x6e
May 19 15:35:02 hostname kernel: [<c015ae7d>] vfs_read+0xda/0xe2
May 19 15:35:02 hostname kernel: [<c015b06c>] sys_read+0x3c/0x62
May 19 15:35:02 hostname kernel: [<c011ae55>] do_page_fault+0x0/0x5c6
May 19 15:35:02 hostname kernel: [<c0105c80>] do_notify_resume+0x28/0x38
May 19 15:35:02 hostname kernel: [<c02d4966>] work_notifysig+0x13/0x15
May 19 15:35:02 hostname kernel: Code: 90 80 3e 00 7e f9 fa eb e8 89 d8 5b 5e c3 53 89 c3 fa 81 78 04 ad 4e ad de 74 18
ff 74 24 04 68 c3 71 2e c0 e8 24 f3 e4 ff 58 5a <0f> 0b 85 00 2e 62 2e c0 f0 fe 0b 79 09 f3 90 80 3b 00 7e f9 eb
May 19 15:35:02 hostname kernel: <0>Fatal exception: panic in 5 seconds

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Oct 3, 2008

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Here is what I have thought of until now.

Site's sales page (which also happens to be the first page that visitors hit) hosted with Amazon S3 service. All public media files are off loaded to amazon S3 service to keep the number of requests on the hosted setup to minimum.

At the front we can have a high performance firewall like Cisco ASA 5520 followed by two dedicated load balancers in Active/Active state.

Behind the load balancers we have 3 front end servers acting as web-servers. These have SAS disks, 4GB RAM, RAID 1 setup, Dual Xeon Quad core processors each.

Behind the front end servers - we have a dedicated load balancer for the database cluster.

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The private network is on a GigaLan.

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Here's the my.cnf right now after i played around with the numbers

server spec
Opteron 170 (2ghz)
2gb ram
250 7200rpm

# Default to using old password format for compatibility with mysql 3.x
# clients (those using the mysqlclient10 compatibility package).
back_log = 75
key_buffer = 256M
myisam_sort_buffer_size = 64M
join_buffer_size = 1M
read_buffer_size = 1M
sort_buffer_size = 2M
table_cache = 1800
thread_cache_size = 384
wait_timeout = 7200
max_connections = 600
connect_timeout = 100
wait_timeout = 12000
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max_heap_table_size = 64M
max_allowed_packet = 15M
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read_rnd_buffer_size = 524288
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query_cache_size = 150M
query_cache_type = 1
query_prealloc_size = 65536
tmp_table_size = 64M
query_alloc_block_size = 131072
default-storage-engine = MyISAM


nice = -5
open_files_limit = 8192

max_allowed_packet = 16M

key_buffer = 64M
sort_buffer = 64M
read_buffer = 16M
write_buffer = 16M

Timeout 20

# KeepAlive: Whether or not to allow persistent connections (more than
# one request per connection). Set to "Off" to deactivate.
KeepAlive Off

# MaxKeepAliveRequests: The maximum number of requests to allow
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MaxKeepAliveRequests 100

# KeepAliveTimeout: Number of seconds to wait for the next request from the
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KeepAliveTimeout 15

## Server-Pool Size Regulation (MPM specific)

# prefork MPM
# StartServers: number of server processes to start
# MinSpareServers: minimum number of server processes which are kept spare
# MaxSpareServers: maximum number of server processes which are kept spare
# ServerLimit: maximum value for MaxClients for the lifetime of the server
# MaxClients: maximum number of server processes allowed to start
# MaxRequestsPerChild: maximum number of requests a server process serves
<IfModule prefork.c>
StartServers 8
MinSpareServers 5
MaxSpareServers 20
ServerLimit 200
MaxClients 200
MaxRequestsPerChild 1500

# worker MPM
# StartServers: initial number of server processes to start
# MaxClients: maximum number of simultaneous client connections
# MinSpareThreads: minimum number of worker threads which are kept spare
# MaxSpareThreads: maximum number of worker threads which are kept spare
# ThreadsPerChild: constant number of worker threads in each server process
# MaxRequestsPerChild: maximum number of requests a server process serves
<IfModule worker.c>
StartServers 2
MaxClients 150
MinSpareThreads 25
MaxSpareThreads 75
ThreadsPerChild 25
MaxRequestsPerChild 0

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Right now the server is able to handle this stuff without much of a problem, and the average CPU load is between .5 and 3 (after a TON of tweaking!) - the only exception is when the forum db is being backed up/optimized, which isn't a huge problem since it happens during the off hours.

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On restart, Apache / MYSQL is stable until the load / mem usage begins to climb then it is restarted again. Here are my 'load' stats for today:

Load for today
High (2:18am): 4.63
Low (3:30am): 1.20
Mean: 1.84
Latest: 1.61

Mem usage for today
High (1:36am): 9,192.9 MB
Low (1:48am): 7,995.7 MB
Mean: 8,683.1 MB
Latest: 8,781.7 MB

I have seen it using 20GB RAM before.

I have tried to follow various optimisation guides but these seem tailored to less powerful servers.

The web application I run on this server is almost entirely MYSQL based, with thousands of DB calls a day. Across the entire system I probably get 200,000 bot hits per day or even more. At peak times search engine bots are literally hammering the server.

My server specs are:

# Processor: Quad-Core Xeon Processor * 8
# CPU Speed: 3Ghz
# RAM: 32 GB DDR2
# HDD: 36 GB 15k Raptor X2 + 1TB Sata
# OS: 32Bit CentOS

Changes / optimisation of the actual application is not possible.

My configuration files are:

My.cnf ....

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