LSWS optimization request

Discussion in 'Install/Configuration' started by LiteSpeeder, Dec 28, 2009.

  1. LiteSpeeder

    LiteSpeeder Well-Known Member


    I'm running a big vBulletin forum. Web and DB servers are separate.

    The problems happen in the peak times.

    Members see many 503 error pages and i see these warnings in lsws logs:
    13.000+ online vbulletin users (cookie timeout 15 min)
    500-600 instant php & mysql connections

    Before requesting tuning recommendations, i want to ask if it's possible to handle this traffic in one box? (web server)

    My LSWS settings:




    lsphp5 settings:

    DB server, my.cnf:
    back_log = 50
    max_connections = 1256
    key_buffer_size = 800M
    myisam_sort_buffer_size = 10000M
    myisam_max_sort_file_size = 10000M
    myisam_max_extra_sort_file_size = 10000M
    join_buffer_size = 1M
    read_buffer_size = 1M
    sort_buffer_size = 3M
    table_cache = 5000
    thread_cache_size = 1024
    wait_timeout = 300
    connect_timeout = 10
    tmp_table_size = 128M
    max_heap_table_size = 128M
    max_allowed_packet = 128M
    net_buffer_length = 16384
    max_connect_errors = 10
    thread_concurrency = 4
    concurrent_insert = 2
    table_lock_wait_timeout = 30
    read_rnd_buffer_size = 1M
    bulk_insert_buffer_size = 8M
    query_cache_limit = 8M
    query_cache_size = 256M
    query_cache_type = 1
    query_prealloc_size = 262144
    query_alloc_block_size = 65536
    transaction_alloc_block_size = 8192
    transaction_prealloc_size = 4096
    default-storage-engine = MyISAM
    max_write_lock_count = 16
    nice = -10
    open_files_limit = 8192
    max_allowed_packet = 16M
    key_buffer = 128M
    sort_buffer = 128M
    read_buffer = 64M
    write_buffer = 64M
    Real-Time Stats:
  2. LiteSpeeder

    LiteSpeeder Well-Known Member

    Btw, i'm usign APC. I actually have APC, eaccelerator and xcache installed. I'm trying them one by one...when i swith to xcache, EAProc WaitQ is always filled up so i can't use xcache...
  3. mistwang

    mistwang LiteSpeed Staff

    Please download and do a manual upgrade to 4.0.12 again. the latest build is more aggressive in closing files, it may solve your problem.
    Since the web server load is pretty high, I think it is better to have a dedicate DB server.
    If DB server is not that busy, you can use it as secondary web server by routing some PHP requests to it.
  4. LiteSpeeder

    LiteSpeeder Well-Known Member

    What do you mean by dedicate db server? I already have two servers. 1 web, 1 db. I also have a less powered (dual xeon 2.8, GB RAM) web server i'm using it for some static files. I've just installed litespeed web server standard to it.

    Ok, thanks for the re-install suggestion. What do you think about my settings above?
  5. mistwang

    mistwang LiteSpeed Staff

    I mean you should keep you current setup instead of trying to use just one server.
    You configuration looks fine. You can try increase "Max connections" if you still have the "Running short of concurrent connections" problem after upgrade to latest 4.0.12 .
  6. anewday

    anewday Moderator

    I can't help much with the mysql/php config.

    Your server should be able to handle the load easily. What is the iowait? Try increasing process soft and hard limit for lsphp5 Also, post the realtime stats for lsapi from the web console.
    Last edited: Dec 30, 2009
  7. mistwang

    mistwang LiteSpeed Staff

    Seems your DB server has very high I/O wait, that could the cause of the slow down.
    You should check DB server with

    mysqladmin processlist

    when I/O wait is high, maybe it is caused by a bad SQL, or missing index of a large table.

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