RE: We've Added more memory...but I can't remember! -- MIDRANGE-L

Thank you Charly, Vernon, Andy and Richard...
You guys are always great.



>From: "Charly Jones" <charly301@hotmail.com>
>Reply-To: midrange-l@midrange.com
>To: midrange-l@midrange.com
>Subject: RE: We've Added more memory...but I can't remember!
>Date: Thu, 11 Jul 2002 09:44:08 +0000
>
>
>
>
>>From: "Rick Rayburn" <the400man@hotmail.com>
>>
>>wait...so I should add 62,500 k to machine pool from the 1 gig?
>>
>
>Yes -- If you add 1 gigabyte of memory (and the machine pool was correctly
>sized before you added the memory) you will need to add something like
>62,500 kilobytes to the machine pool to handle the "virtual address"
>mechanism for that gigabyte of memory.  I have seen people buy a bunch of
>memory and get significantly _worse_ performance because their machine pool
>was too small.
>
>But the real way to tell if there is enough memory in the machine pool is
>to
>watch the non-database faulting rate (with the WRKSYSSTS command for a few
>minutes at a time) when the system is fairly busy.  If the machine pool
>non-database faulting rate is almost always under 5 faults per second, you
>probably have enough memory in the machine pool.
>
>Similarly, if you get everything but the operating system jobs out of *BASE
>and get enough memory in that pool, your non-database faulting will be less
>than 10 faults per second most of the time.  If the faulting is higher, you
>most likely have some disruptive jobs running in that pool with your
>operating system.  I have had to put as much as 30 megabytes of memory in
>*BASE to get the faulting down after I have taken batch and communications
>and everything else that can be removed out of the *BASE pool.
>
>Most systems I have seen recently have lots and lots of memory and it is
>being mostly wasted.  I can tell because they have an automatic tuner
>moving
>memory around like crazy - the faulting is still high - the bottleneck is
>usually the disk resources (don't get me started on that topic) - the CPU
>is
>not being fully utilized - and the solution to any performance problem is
>to
>buy more CPU or more memory.
>
>That's what I think anyway.  Your mileage may vary...
>
>--  Charly
>
>
>
>
>
>>>From: "Charly Jones" <charly301@hotmail.com>
>>>
>>>> > If it does, any GENERAL rule of thumb to follow for incrementing the
>>>>MACHINE pool?
>>>
>>>First, unless IBM has made some
>>>major architectural changes that I don't know about, the VAT (virtual
>>>address translator) mechanism requires some pinned memory in the machine
>>>pool to keep track of what "real" address is stored in each memory frame.
>>>If I remember correctly - when you add 16 gigabytes of memory to a system
>>>you need to put 1 gigabyte of additional memory in the machine pool just
>>>for
>>>that purpose alone.  The rule of thumb is one sixteenth of the memory
>>>added
>>>needs to be added to the machine pool.
>>>
>>>> > On Behalf Of Rick Rayburn
>>>> > Subject: We've Added more memory...but I can't remember!
>>>> >
>>>> > ...if I need to "goose" up the machine pool with additional
>>>>"wattage".
>>>> >
>>>> > the memory was added because we got a great deal on the chips NOT
>>>>because
>>>> > we
>>>> > were experiencing problems. I believe all of the additional "K" was
>>>>dumped
>>>> > into *BASE but I'm not certain.
>>>> > Does anyone remember/know if memory additions ALWAYS dump into Base?
>>>> > If it does, any GENERAL rule of thumb to follow for incrementing the
>>>> > MACHINE
>>>> > pool? I believe I OVER-allocated memory to the "SPOOL POOL" by
>>>>granting an
>>>> > average of 300 K per active writer. Any thoughts on that as well...or
>>>> > anything else memory-pool related?
>>>> >
>>>> > Thanks all.
>>>> >
>>>> > Rick Rayburn
>>>>
>>>
>>>
>
>
>
>"Nothing would please me more than being able to hire ten programmers and
>deluge the hobby market with good software."  -  Bill Gates in 1976
>
>"We are still waiting..."  -  Alan Cox in 2002
>
>"Linux is only free if your time is worthless."
>
>
>Charly Jones
>253 265-6244
>Gig Harbor
>Washington USA
>
>
>
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