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Thread: Webmail and CPU consumption

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    cmargena is offline Active Member
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    Default Webmail and CPU consumption

    Hi Gurus,
    Is the first time that we stress test zimbra's webmail application and we seeing a very strange behaviour, in a VM (on vmware) CentOS 5.3 64-bit with 1 GB and 4 CPUs, the test is 20 users sending and reading their inbox. After 5 minutes the VM did not respond and we have to restart.
    I think we have missonfigured something, but my question is: Is there any rule of thumb that can guide us to size how many users per CPU Webmail can handle? (of course, given the CPU speed).
    Is there any difference at the server level between standar and rich interface?

    Thanks,
    Claudio

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    LMStone is offline Moderator
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    Quote Originally Posted by cmargena View Post
    Hi Gurus,
    Is the first time that we stress test zimbra's webmail application and we seeing a very strange behaviour, in a VM (on vmware) CentOS 5.3 64-bit with 1 GB and 4 CPUs, the test is 20 users sending and reading their inbox. After 5 minutes the VM did not respond and we have to restart.
    I think we have missonfigured something, but my question is: Is there any rule of thumb that can guide us to size how many users per CPU Webmail can handle? (of course, given the CPU speed).
    Is there any difference at the server level between standar and rich interface?

    Thanks,
    Claudio
    Hi Claudio,

    I suggest giving the server another 2-3GB of RAM and see what happens.

    Also, please run "zmcontrol -v" as the zimbra user and paste the version information into your forums profile please.

    All the best,
    Mark

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    cmargena is offline Active Member
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    Quote Originally Posted by LMStone View Post
    Hi Claudio,

    I suggest giving the server another 2-3GB of RAM and see what happens.

    Also, please run "zmcontrol -v" as the zimbra user and paste the version information into your forums profile please.

    All the best,
    Mark
    We have run a successfull test with 3500 users, 4 CPUs and 8 GB RAM and a JVM instance with a heap of 6GB.
    I have update my profile so everybody can see what version we are testing.

    I have another question: Is there any way to run more than one JVM on a Zimbra Server? We hit a maximum of 3500 users with a single JVM, we need to double that number.

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    Klug is offline Moderator
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    7000 simultaneous active users per server is not a low number.

    ZCS is made to scale horizontally: you don't need/have to do things as several JVM per server, just add another mailbox server...

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    cmargena is offline Active Member
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    Quote Originally Posted by Klug View Post
    7000 simultaneous active users per server is not a low number.

    ZCS is made to scale horizontally: you don't need/have to do things as several JVM per server, just add another mailbox server...
    Klug, I think everybody will be interested in this, we are testing Zimbra to be a Webmail solution for a mutimedia company, so we need to scale in the same box. What we see is that there are more resources available but they are not used (memory and CPU) when we put 4000 users in the same JVM the virtual users do not get response from the server, that's why I thought about adding a JVM to the same Zimbra Mailbox Server, I know this is not a standard installation procedure but do you think this can be done?

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    dalmate is offline Elite Member
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    My server: 2 cpus, quad core each cpu, 4 GB RAM, 4x143 HDD RAID
    It servers about 1000 users

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    cmargena is offline Active Member
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    Quote Originally Posted by dalmate View Post
    My server: 2 cpus, quad core each cpu, 4 GB RAM, 4x143 HDD RAID
    It servers about 1000 users
    What is your CPU utilization? With this server I would expect 10% utilization in peak.

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