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A
Anonymous
September 14, 2010
Question

FMS 3.5 Interactive horrible performance

  • September 14, 2010
  • 1 reply
  • 1377 views

Software: FMS 3.5 interactive license

OS: Fedora Core 4

CPU: Intel(R) Xeon(R) CPU E5405  @ 2.00GHz

RAM: 62G

DISK: 8 2T drives with software raid 10

APP: Standard VOD app


FMS Connections: Max 5.10k   Avg 2.01k

Bandwidth Out: Max 248M    Avg 85M

CPU 100% all the time. Server becomes unresponsive. I have 4 other servers with the same specs with less connections and have the same result. What can I do to bring the load of the server down?? With performance like this I will need 10 servers to serve such a small amount of traffic. I also have 2 servers running Debian 5.0.5 with twice the cpu as the one listed above and it didnt help very much at all.

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    1 reply

    E
    Ed_Chan
    Participating Frequently
    September 14, 2010

    We are definitely able to saturate a 1G NIC before maxing out cpu.  However, our tests are run on

    4 CPU’s [Intel(R) Xenon(R) CPU E5430 @2.66 GHz]

    9 GB RAM

    For RTMP/RTMPE, we see 1G NIC max out at about 30%.  This goes down with more RTMPT/RTMPTE connections.

    We also tested on RHEL 4, our officially supported platform, though I suspect the issue is simply that you are hitting the limits of what can be handled by a single cpu machine.

    One suggestion I have is to try and spread the load out across multiple fmscore processes so you can make better use of all that RAM.  That might allow you to cache more content in memory, reducing disk i/o, which might improve your throughput.

    A
    Anonymous
    September 14, 2010

    I dont understand your meaning about me reaching the limit of a single cpu machine. The cpu you listed only has a slight performance diff than mine. My proc is listed as 8 cores in linux. Just as I am sure your does.

    I also have FMS running on 2 Intel(R) Xeon(R) CPU E5520  @ 2.27GHz with Debian 5.0.5 showing 16 cores. With the same amount of ram in this server has very little performance increase. Server is being killed between 80% and 90% cpu usage with no more than 300M out of a 4 port 1G bond on the nic.

    I would love to see your FMS configs that you use to produce this kind of traffic with so little load. I am running 10 FMS servers right now trying to balance out load and looks like I need to add 10 more with this kind of crappy performance.

    I see in many places with you all say that you can max out a 1G nic bla bla bla and so on but I have yet to see any proof of this. Do you have some sort of secret config that only you are allowed to have?? For what I paid for my 10 interactive license I would think that I would be able to produce 20 times the traffic that I am doing now.

    E
    Ed_Chan
    Participating Frequently
    September 14, 2010

    8 cores?  Hmm, than I am the one that is confused.  You didn't mention 8 core, so I assumed single core.  Our tests were done on a 4 core machine.  But as I said, we're able to max out a 1G NIC at 30% cpu.

    Couple things to note, more RAM doesn't necessarily help if your process can't use it.  With 32-bit processes, you're obviously limited by how much RAM can be used, which is why I suggested distributing load across more fmscore processes, so each process can use more of that 62GB of RAM that you have.  Also, I'm not sure if you need PAE kernel to use that much RAM?

    The other thing to note is that our testing has been done on RHEL 4, which is our officially supported platform.  Any chance you can try your test on an RHEL 4 machine?

    Our configs would be default configs.  But the main config is the size of the file cache, in fms.ini, SERVER.FLVCACHE_MAXSIZE = 500 (MB).

    Another thing to check is how much of this traffic is RTMPT vs. RTMP?  RTMPT would also affect performance.

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