Why such a Linux/Windows difference on the same computer
Anonymous
8 Feb 2005 17:28:28 UTC
Topic 10812
(moderation:
> Hi,
>
> On my older computer with AMD Athlon 1200 and 512 MiB of memory I'm runing
> Windows XP with SP2 and Mandrake Linux 10.1. In both OSes I have BOINC 4.19
> installed and runing.
>
> The problem is that BOINC is runig a lot slower in Linux while other things
> are running at about the same speed as expected.
>
> This is the info from the BOINC benchmark:
>
> Linux:
> Measured floating point speed: 632.92 million ops/sec
> Measured integer speed: 1442.49 million ops/sec
> CPU Time: ~64000 sec
>
> Windows:
> Measured floating point speed: 1043.79 million ops/sec
> Measured integer speed: 2515.06 million ops/sec
> CPU Time: ~38500 sec
>
> I don't know about this on my AMD Athlon 64 machines as you still have not
> released any 64-bit client compiled for AMD64. But why is there such a strange
> difference on AMD Athlon 1200?
The Windows compiler is (obviously) doing a better job of code optimization. This might be fixable by tweaking some of the compiler flags used in building the Linux version of the core client.
Cheers,
Bruce
Why such a Linux/Windows difference on the same computer
)
Here is a thread that describes the differences and has an FAQ for building an optimized client.
http://setiweb.ssl.berkeley.edu//node/
----- Rom [url=http://www.romwnet.org/dasblogce]My Blog[/url]
There are quite some threads
)
There are quite some threads in the forums here that discuss runtimes on different architectures, clients and OS, e.g. "curious run times" and "3 Different Versions". To summarize:
- The benchmarks are technically wrong in most Windows clients. Apparently the MS compiler identifies some part of them as having no effect (well, it's a benchmark) and thus doesn't compile them at all. Should be fixed in 4.66, I've not tested it myself yet.
- Our App is definetly running faster on Windows than on Mac / Linux, probably due to the different compilers we use. We tried to narrow the gap as much as we could (see "WOW the new einstein app.4.46 is 100 % faster"), but it's still there.
- There is no 64-Bit optimized App (yet), neither for Intel nor AMD nor PPC, and this will probably stay so at least until we are public (see e.g. "Upgraded Boinc client" in Q&P).
BM
BM