double result = 0; #pragma omp parallel num_threads(ndata) { double local_result; int num = omp_get_thread_num(); if (num==0) local_result = f(x); elseif (num==1) local_result = g(x); elseif (num==2) local_result = h(x); #pragma omp critical result += local_result; }
double result = 0; #pragma omp parallel { double local_result; #pragma omp for for (i=0; i<N; i++) { local_result = f(x,i); #pragma omp critical result += local_result; } // end of for loop }
intmymax(int r,int n) { // r is the already reduced value // n is the new value int m; if (n>r) { m = n; } else { m = r; } return m; } #pragma omp declare reduction \ (rwz:int:omp_out=mymax(omp_out,omp_in)) \ initializer(omp_priv=INT_MIN) m = INT_MIN; #pragma omp parallel for reduction(rwz:m) for (int idata=0; idata<ndata; idata++) m = mymax(m,data[idata]);
显卡能让显存达到更高的频率显存颗粒与GPU配套使用时，一般都经过专门的设计和优化，而不像内存那样有太多顾忌。GPU的显存控制器比CPU或北桥内存控制器性能优异，而且显卡PCB可以随意的进行优化，因此显存一般都能达到更高的频率。而内存受到内存PCB、主板走线、北桥CPU得诸多因素的限制很难冲击高频率。由此算来，显存与内存“分家”既是意料之外，又是情理之中的事情了。为了更好地满足显卡GPU的特殊要求，一些厂商(如三星等)推出了专门为图形系统设计的高速DDR显存，称为“Graphics Double Data Rate DRAM”，也就是我们现在常见的GDDR。
cd <compdir>\ tar -xvf aocc-compiler-<ver>.tar cd aocc-compiler-<ver> bash install.sh # It will install the compiler and displaythe AOCC setup instructions.
source <compdir>/setenv_AOCC.sh # This will setup the shell environment for using AOCC C, C++, and Fortran compiler where the command is executed.
Please verify that both the operating system and the processor support Intel(R) X87, CMOV, MMX, FXSAVE, SSE, SSE2, SSE3, SSSE3, SSE4_1, SSE4_2, MOVBE, POPCNT, AVX, F16C, FMA, BMI, LZCNT, AVX2, AVX512F, ADX and AVX512CD instructions.
-xCORE-AVX2
1
Please verify that both the operating system and the processor support Intel(R) X87, CMOV, MMX, FXSAVE, SSE, SSE2, SSE3, SSSE3, SSE4_1, SSE4_2, MOVBE, POPCNT, AVX, F16C, FMA, BMI, LZCNT and AVX2 instructions
没有 FXSAVE,BMI,LZCNT 有BMI1，BMI2
使用-xAVX,或者-xHOST 来选择可用的最先进指令集
1
Please verify that both the operating system and the processor support Intel(R) X87, CMOV, MMX, FXSAVE, SSE, SSE2, SSE3, SSSE3, SSE4_1, SSE4_2, POPCNT and AVX instructions.
-fast bugs
1 2 3 4 5
ld: cannot find -lstdc++ ld: cannot find -lstdc++ /public1/soft/intel/2020u4/compilers_and_libraries_2020.4.304/linux/compiler/lib/intel64_lin/libiomp5.a(ompt-general.o): In function `ompt_pre_init': (.text+0x2281): warning: Using 'dlopen' in statically linked applications requires at runtime the shared libraries from the glibc version used for linking /var/spool/slurm/d/job437118/slurm_script: line 23: ./SLIC_slurm_intel_o3: No such file or directory
