Re: performance of jailed processes

From: Alexander Leidinger (Alexander_at_Leidinger.net)
Date: 03/31/04

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    Date: Wed, 31 Mar 2004 11:32:11 +0200
To: Martin Blapp <mb@imp.ch>

    On Wed, 31 Mar 2004 10:00:14 +0200 (CEST)
    Martin Blapp <mb@imp.ch> wrote:

    >
    > Hi DES,
    >
    > > Specifically, running a query against a remote MySQL server from
    > > inside a jail takes an order of magnitude more time than from outside
    > > the jail. Tcpdump shows that the TCP packets carrying the result are
    > > evenly spaced, so this is not a matter of the server timing out on a
    > > DNS lookup or anything like that.
    >
    > Could you try the following things ? Use libthr or libpthreads for mysql and
    > see if the results are still the same. Do the same test with linux-threads
    > (all our mysqls on 4.x with jails use linux-threads and we don't see any
    > problems)

    I just had a similar problem with MySQL on a system without jails
    (-current as of Mar 19), but with one IP-alias. Feeding the initial
    content of a DB from a 4.6 MB file needed too long (I aborted after two
    minutes). Binding MySQL to the main IP only didn't changed this. I
    recompiled with linux-threads and it finished importing the data after
    20 seconds.

    I can't test more on this machine, since it is scheduled to go into
    production today or tomorrow, but I could add mysql to a test machine
    (with a more recent -current) and use the same file there if needed.

    Bye,
    Alexander. 

    -- 
                    I'm available to get hired.
http://www.Leidinger.net                       Alexander @ Leidinger.net
  GPG fingerprint = C518 BC70 E67F 143F BE91  3365 79E2 9C60 B006 3FE7
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