Robert Watson wrote:
On Tue, 12 Aug 2008, Tim Traver wrote:
I have recently had the opportunity to upgrade a few servers from old
versions of 5.4 to 7.0, and have seen some interesting data. Before
doing this, I wanted to take some benchmarks to see how the scripts
that I would run would fare between the two versions, and the results
are somewhat confusing...
There are potentially a lot of variables here, you migh want to try
fiddling with the following and see what difference it makes:
(1) Try both 4BSD and ULE in 7.0 -- they have different properties,
and at the
very least it would be nice to see what impact it has.
(2) Statically compile the 5.4 binary, and run the same binary on both
5.4 and
7.0 -- there have been lots of compiler changes, which might be
relevant.
Also, can you confirm that you're running either 32-bit or 64-bit
kernels consistently on both versions of FreeBSD?
Robert N M Watson
Computer Laboratory
University of Cambridge
Robert,
Yes, I agree, there are a lot of moving variables.
1) I did try the 4BSD scheduler too, and found that it was actually much
worse. It may be because the ubench will spawn a few processes, and ULE
is better at SMP than 4BSD is, but I don't know...
2) Unfortunately, I have now already replaced the 5.4 machines with 7.0.
I tried to take the benchmarks before I rebuilt things. Like I said, I'm
sure my methods were flawed...
These were both compiled with the 32 bit code...
Is there anything that I can do on this latest 7.0 box that might be
useful information???
Thanks,
Tim.
I tried to get as many ducks in a row before posting this, cause i
don't want to waste any of the developers precious time, but I can't
guarantee that my methods were not flawed.
For simplicity, I used a port called ubench (the latest version 0.3,
which I know is quite old) to get the following numbers :
Since I was doing this on the same machine, with completely different
builds (not simply a compile upgrade, but a full install), I figure
it doesn't really matter what kind of machine it is, but just for
grins, it is a Dual Opteron with 2GB of memory in it, compiled with
the i386 confs.
The 7.0 is compiled with the ULE scheduler...
The following are averages of at least 5 runs :
FreeBSD 5.4 - CPU 112,721 - MEM - 146,483
FreeBSD 7.0 - CPU 177,339 - MEM - 95,920
Now, I really don't know exactly what the ubench program is doing,
but I think the description says that it is doing random integer and
floating point operations for the CPU tests, and random memory
allocation and copying for the memory test.
So, can we explain the difference???? It looks like the latest SMP
code allows it to process more operations, but what happened to the
memory operations????
Just to get an idea of what this was going to do to my scripts, I
tried some benchmarks for those as well.
I tried to run a PHP script using php 4.4.7 and got the following
results :
Using "time php index.php" to get the real time :
FreeBSD 5.4 - 0.290 seconds
FreeBSD 7.0 - 0.335 seconds
So, do the slower memory operations cause that difference in the real
time it takes to run that script???
Thanks,
Tim.
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