Mailinglist Archive: opensuse (3653 mails)
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Re: [SLE] Win4Lin
- From: "Jerry Feldman" <gerald.feldman@xxxxxx>
- Date: Mon, 3 Jun 2002 17:07:53 -0400
- Message-id: <3CFBA269.4161.5EA3D44A@localhost>
Years ago, I ran an IBM datacenter. We ran VM/370 with OS/VS1 as our
production OS and CMS for our programmers to use. While not a realistic
benchmark, we were converting our payroll from Burroughs to IBM. I ran
payroll one night with OS/VS1 native, and the next night, nearly the same
data with some corrections, except that OS/VS1 was running under VM/370
with a few logged in CMS users. If I recall correctly the payroll actually
finished earlier under VM/370 earlier than native. Later I went to a SHARE
conference. One presentor showed some benchmarking results where they were
running DOS (IBM mainframe DOS) under VM/370 and they were able to achieve
better throughput with DOS under VM/370 than native.
In the case of VM/370, the big win was paging and spooling. I found that
double spooling (using the OS native spooling which then spooled to VM/370)
was actually faster than the spooling with the OS booted native. In the
case of DOS and OS/VS1 there were many hacks both in VM/370 and the
firmware on the 370 which provided some efficiencies. VM/370 paging was
more efficient than the DOS or OS/VS1 paging.
In any case, under Win4Lin, you are using the native Linux file system
which is faster than the Windows VFAT file system. But, as above, the
answer is throughput. Windows9x has some limitations due to its dependence
on MS-DOS. A VM can mitigate some of these limitations. I'm just
generalizing here because I don't have the more detailed knowledge I used
to have back when I ran an IBM shop.
On 3 Jun 2002 at 22:17, Anders Johansson wrote:
> Explain please. I genuinely want to know. How could any program running in a
> virtual environment be as fast or faster than running on the bare hardware?
> If I had an application where speed was the #1 priority I wouldn't choose
> linux, I'd run it without any OS at all.
--
Jerry Feldman
Enterprise Systems Group
Hewlett-Packard Company
200 Forest Street MRO1-3/F1
Marlboro, Ma. 01752
508-467-4315 http://www.testdrive.compaq.com/linux/
production OS and CMS for our programmers to use. While not a realistic
benchmark, we were converting our payroll from Burroughs to IBM. I ran
payroll one night with OS/VS1 native, and the next night, nearly the same
data with some corrections, except that OS/VS1 was running under VM/370
with a few logged in CMS users. If I recall correctly the payroll actually
finished earlier under VM/370 earlier than native. Later I went to a SHARE
conference. One presentor showed some benchmarking results where they were
running DOS (IBM mainframe DOS) under VM/370 and they were able to achieve
better throughput with DOS under VM/370 than native.
In the case of VM/370, the big win was paging and spooling. I found that
double spooling (using the OS native spooling which then spooled to VM/370)
was actually faster than the spooling with the OS booted native. In the
case of DOS and OS/VS1 there were many hacks both in VM/370 and the
firmware on the 370 which provided some efficiencies. VM/370 paging was
more efficient than the DOS or OS/VS1 paging.
In any case, under Win4Lin, you are using the native Linux file system
which is faster than the Windows VFAT file system. But, as above, the
answer is throughput. Windows9x has some limitations due to its dependence
on MS-DOS. A VM can mitigate some of these limitations. I'm just
generalizing here because I don't have the more detailed knowledge I used
to have back when I ran an IBM shop.
On 3 Jun 2002 at 22:17, Anders Johansson wrote:
> Explain please. I genuinely want to know. How could any program running in a
> virtual environment be as fast or faster than running on the bare hardware?
> If I had an application where speed was the #1 priority I wouldn't choose
> linux, I'd run it without any OS at all.
--
Jerry Feldman
Enterprise Systems Group
Hewlett-Packard Company
200 Forest Street MRO1-3/F1
Marlboro, Ma. 01752
508-467-4315 http://www.testdrive.compaq.com/linux/
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