Mailing List CGatePro@mail.stalker.com Message #103976
From: Wayde Nie <wayde@nie.ca>
Subject: Re: CGP 32 or 64bits
Date: Fri, 01 Mar 2013 13:34:52 -0500
To: CommuniGate Pro Discussions <CGatePro@mail.stalker.com>
X-Mailer: Evolution 2.32.2
Agreed. Storage performance is probably the number one constraint on mid
to large CGP systems... More so than RAM or CPU.

Even with 120GB some-odd of RAM file cache, our waitio is about 20% or
so at mid-day. Our storage is an 80 disk HP EVA across an 8GB/s FC SAN
(although the EVA itself only has 4GB/s interfaces, but 4 of 'em).

PS. In my last email, I meant to add that, although we use the 64bit CGP
on 64bit Linux, to Nicolas' original point: the 32bit version of CGP
probably would work as well for us since CGP uses less than the
addressable 3.5(ish)GB ram for a 32bit build... As long as we stuck to a
64bit OS that has a VFS with intelligent file caching...

W.

On Fri, 2013-03-01 at 18:05 +0100, Juergen P. [core] wrote:
> regarding performance:
>
> storage must be fast ..   using slow disks / storage systems may decrease
> performance. (keep an eye on iops and stuff )
> memory management  is, as mentioned before, very efficient.
>
>
> kr
>
> Juergen
>
> On Fri, 01 Mar 2013 11:35:29 -0500
>   Wayde Nie <wayde@nie.ca> wrote:
> >> I can attest that CGP uses memory quite efficiently :-) and that
> >>adding
> >> more memory won't likely get taken up by CGP itself, however, file
> >> caching in "left over" RAM (depending on OS) can help performance a
> >> whole lot...
> >>
> >> We run a fairly large installation, from a concurrent IMAP
> >>connections
> >> point of view at least... Our daily peak approaches 4500 concurrent
> >>IMAP
> >> connections (Friday's a slow day for us, we're at 4201 at the
> >> moment :-).
> >>
> >> Even still, the RES memory for the CGServer process is only 1.6G
> >>(2.5G
> >> VIRT).
> >>
> >> The server is Linux 64bit with 128G RAM, and while CGP won't use
> >>much of
> >> that, we get big gains from linux file caching, which provides
> >> performance gains. We currently have about 97% of our memory in
> >>file
> >> cache, leaving less than 4G for CGP and the rest of the system,
> >>which it
> >> seems quite comfortable with...
> >>
> >> W.
> >>
> >>
> >> On Fri, 2013-03-01 at 10:34 -0500, Nicolas Hatier wrote:
> >>> The 32bit version is likely limited to 4gb of ram (more likely
> >>>3.something)
> >>>
> >>> CGP is not memory-hungry. Unless you have a very large installation
> >>>with
> >>> several thousand concurrent IMAP connexions, or something else on
> >>>your
> >>> server taking most of the memory, I doubt adding more memory will
> >>>make
> >>> CGP any faster.
> >>>
> >>> Nicolas
> >>>
> >>> On 2013-03-01 09:46, Vesse Michel wrote:
> >>> > Hello,
> >>> > thank you for your help,
> >>> > on my CGP W2003_32bits, i have actually my INBOX on
> >>>Multi-Mailbox.
> >>> > I created INBOXmdir folder and I  moves messages from INBOX
> >>> > (Multi-Mailbox) to INBOXmdir and have no problem with the
> >>>limitation
> >>> > of 2GB.
> >>> >
> >>> > I would use more memory ram for CGP to make it faster, but I
> >>>think the
> >>> > 32bit version is limited to 8GB of ram.
> >>> > Can i put more RAM on my 32Bit server  or should I change to a 64
> >>>bit
> >>> > server?
> >>> >
> >>> > Best regards
> >>>
> >>>
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> Best Regards
>
> Juergen Paulhart
>
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