fastmemcpy(sse)一般来说在cpu和内存之间存在l1l2和l3三级缓存还有几种tlb缓存在此不涉及每级缓存的速度有一个数量级左右的差别容量也有较大差别实际上跟有关呵呵而l1缓存更是细分为指令缓存和数据缓存用于不同的目的 让我们回过头来看看P4架构下的Cache结构。 The IA-32 Intel Architecture Software Developer's ...
刚刚写了一个fast的memcpy,叫做Pz_memcpy;至于Pz,就是Proze的缩写,而Proze是什么,你们以后就知道了。 代码随便用,no copyright。 /* * healer * healer_kx@163.com * OR yuzhongm@cn.ibm.com */ void*Pz_memcpy(void*dest,void*src, size_t len) ...
Hi, I am working with a code which has several statements where an array is assigned some constant value or one array is copied to other. I can see
云风老大用汇编实现的一个高效memcpy,号称比传统memcpy快50% FastMemcpy https://github.com/skywind3000/FastMemcpy/blob/master/FastMemcpy.h#L580 不过VS2015编译器中已经做了类似的优化。
memcpy_fast=99ms memcpy=346 ms benchmark(size=512 bytes, times=8388608): result(dst aligned, src aligned): memcpy_fast=124ms memcpy=242 ms result(dst aligned, src unalign): memcpy_fast=166ms memcpy=555 ms result(dst unalign, src aligned): memcpy_fast=168ms memcpy=602 ms result(dst ...
/home/alex/Desktop/FEA/mbdyn/src/mbdyn-1.3.7/libraries/libcolamd/colamd.c:1350: undefined reference to `_intel_fast_memcpy'./.libs/libmbwrap.a(mthrdslv.o): In function `naivfct':/home/alex/Desktop/FEA/mbdyn/src/mbdyn-1.3.7/libraries/libnaive/mthrdslv.c:95: undefined reference ...
handle number name 0xbe4518d0 2 anonymous block 导致该错误的是Oracle10.2.0.4 平台上的bug:Bug6074902. 解决方法: (1)安装Patch 6074902 (2) 升级数据库到10.2.0.5 MOS 文档: DataPump Import (IMPDP) Fails With ORA-7445[_INTEL_FAST_MEMCPY.A] While Importing Materialized Views [ID 867578.1] ...
object line object handle number name 0xbe4518d0 2 anonymous block 导致该错误的是Oracle10.2.0.4 平台上的bug:Bug6074902. 解决方法: (1) 安装Patch 6074902 (2) 升级数据库到10.2.0.5 MOS 文档: DataPump Import (IMPDP) Fails With ORA-7445[_INTEL_FAST_MEMCPY.A] Whil...
gcc -O3 -mavx FastMemcpy_Avx.c -o FastMemcpy_Avx with msvc: cl -nologo -arch:AVX -O2 FastMemcpy_Avx.c Features 50% speedup in avg. vs traditional memcpy in msvc 2012 or gcc 4.9 small size copy optimized with jump table medium size copy optimized with sse2 vector copy ...
ORA-07445: exceptionencountered: core dump [_intel_fast_memcpy.A()+10] [SIGSEGV] [Address notmapped to object] [0x00000005E] [] [] MOS上有篇文档说明: Ora-7445 [Kghalp] using REGEXP or TABLEfunctions [ID 415567.1] 在Oracle 10.1.0.4 到10.2.0.2 版本,在SQL 中使用正则表达式或者TABLE()函...