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Re: [opensuse] [OT] is there a virtual machine that IMPROVE performance by using harddisk as harddisk image
- From: Randall R Schulz <rschulz@xxxxxxxxx>
- Date: Tue, 2 Jun 2009 09:22:16 -0700
- Message-id: <200906020922.16714.rschulz@xxxxxxxxx>
On Tuesday June 2 2009, Matthias Bach wrote:
If the system (overall not a single application) is I/O-bound, then by
definition it has plenty of CPU left over and the additional CPU
overhead of virtualization is of little consequence, especially if
there's more than one CPU (or core) available, which is becoming the
norm. If the system is high-utilization (both CPU and I/O)—which is
always desirable from the standpoint of cost-effectiveness—then any
additional overhead from virtualization will cut into the net system
throughput.
Randall Schulz
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Hi!
...
Well, then that software is written poorly.
No, but in the latter case every access will involve two filesystems
and an emulated block device instead of only one filesystem. That
additional overhead is something you will always see in io bound
applications.
If the system (overall not a single application) is I/O-bound, then by
definition it has plenty of CPU left over and the additional CPU
overhead of virtualization is of little consequence, especially if
there's more than one CPU (or core) available, which is becoming the
norm. If the system is high-utilization (both CPU and I/O)—which is
always desirable from the standpoint of cost-effectiveness—then any
additional overhead from virtualization will cut into the net system
throughput.
Regards,
Matthias
Randall Schulz
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