31–40 of 83 posts
Isn't this the textbook reason for using - and contributing to - open-source compilers and libraries?
Isn't this the textbook reason for using - and contributing to - open-source compilers and libraries?
and gcc is not that bad after all. I uses openmp to parallel my program on core i7 860 cpu which should support 8-threads. But using icc as compiler, it will only utilize 7 cores, and it does affect performance (about 10% slower (wall time) than gcc which uses 8 cores). I suspect that it has something to do with the dynamic linked openmp library for icc.
Dynamic linking of the OpenMP library is almost certainly not the cause of the slowness you're observing. If you really want to force the Intel OpenMP runtime to use all 8 cores:
export OMP_DYNAMIC=false
export OMP_NUM_THREADS=8
export KMP_LIBRARY=throughput
# "KMP_BLOCKTIME" is how long an idle worker thread
# should enter a blocking wait for more work before
# sleeping, in milliseconds. default value is 200ms
export KMP_BLOCKTIME=1000
# following are needed if you use Intel MKL
export MKL_DYNAMIC=false
export MKL_NUM_THREADS=8
Sounds like AMD should just start setting the vendor string to "GenuineIntel", then. (This is something like the "like Mozilla" in every user agent string. If dumb software is going to do dumb tests, and you need to fool the dumb test to get your interoperability.)
That would be passing off / trademark infringement FWIW.
Has anyone tried the Sun Studio compilers? They're free and supposed to be as good as Intel, but I've seen virtually no discussion of them.
I was an intern for AMD a few years ago (these are my views and not AMD's). I was pretty skeptical about AMD's antitrust claims against Intel until I went to work there. I'm as free market as they day is long, but there's a whole untold story of the evil things that go on in the back meeting rooms, even outside of sales, where most of the public lawsuit claims are/were. The thing to remember is that AMD is a small fr…
I can't imagine Steve Jobs allowing this to happen at Apple. They have definitely caught people leaking things, and the consequences were swift and unpleasant for the leaker. Why can't AMD catch these people? Is there something preventing them from implementing the same kinds of measures to catch leakers as Apple?
(Using Apple just as an example, of course. I'm sure there are other companies who find leakers and make an example of them through the legal system.)
I was an intern for AMD a few years ago (these are my views and not AMD's). I was pretty skeptical about AMD's antitrust claims against Intel until I went to work there. I'm as free market as they day is long, but there's a whole untold story of the evil things that go on in the back meeting rooms, even outside of sales, where most of the public lawsuit claims are/were. The thing to remember is that AMD is a small fr…
"Even while I was there, we had what I suspect (but have no proof) were incidents of people leaking product plans, roadmaps, etc. (but no IP) to Intel." I can't imagine Steve Jobs allowing this to happen at Apple. They have definitely caught people leaking things, and the consequences were swift and unpleasant for the leaker. Why can't AMD catch these people? Is there something preventing them from implementing the s…
I was an intern for AMD a few years ago (these are my views and not AMD's). I was pretty skeptical about AMD's antitrust claims against Intel until I went to work there. I'm as free market as they day is long, but there's a whole untold story of the evil things that go on in the back meeting rooms, even outside of sales, where most of the public lawsuit claims are/were. The thing to remember is that AMD is a small fr…
Not sure what you mean by this statement. Should AMD get some sort of special consideration because they are smaller than Intel?
Earlier quoted context omitted.
and gcc is not that bad after all. I uses openmp to parallel my program on core i7 860 cpu which should support 8-threads. But using icc as compiler, it will only utilize 7 cores, and it does affect performance (about 10% slower (wall time) than gcc which uses 8 cores). I suspect that it has something to do with the dynamic linked openmp library for icc.
Really? I find Intel's compiler to outperform GCC on pretty much all of the numerical work I do. I build with "-O3 -xHost" and make use of OpenMP. Dynamic linking of the OpenMP library is almost certainly not the cause of the slowness you're observing. If you really want to force the Intel OpenMP runtime to use all 8 cores: export OMP_DYNAMIC=false export OMP_NUM_THREADS=8 export KMP_LIBRARY=throughput # "KMP_BLOCKTI…
Sounds like AMD should just start setting the vendor string to "GenuineIntel", then. (This is something like the "like Mozilla" in every user agent string. If dumb software is going to do dumb tests, and you need to fool the dumb test to get your interoperability.)
Better yet: make it writable. That way the OS could change it per process/thread/context and the code would be happy.
It is possible to change the CPUID of AMD processors by using the AMD virtualization instructions. I hope that somebody will volunteer to make a program for this purpose. This will make it easy for anybody to check if their benchmark is fair and to improve the performance of software compiled with the Intel compiler on AMD processors.