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c++ Programming Glossary: l1http://stackoverflow.com/questions/1095298/gcc-c-linker-errors-undefined-reference-to-vtable-for-xxx-undefined-refere but uses lib1 write If linked like this gcc o plop plop.o l1 l2 Then the linker will fail to resolve the read and write symbols... if I linki the application like this gcc o plop plop.o l2 l1 Then it will link correctly. As l2 resolves the BatchRead and.. also adds two new ones read and write . When we link with l1 next all four dependencies are resolved. share improve this..
Massive CPU load using std::lock (c++11) http://stackoverflow.com/questions/13667810/massive-cpu-load-using-stdlock-c11 std mutex m2 void f1 while true std unique_lock std mutex l1 m1 std defer_lock std unique_lock std mutex l2 m2 std defer_lock.. std unique_lock std mutex l2 m2 std defer_lock std lock l1 l2 std cout f1 has the two locks n std this_thread sleep_for.. std mutex l2 m2 std defer_lock std unique_lock std mutex l1 m1 std defer_lock std lock l2 l1 std cout f2 has the two locks..
Why should `new` be used as little as possible? http://stackoverflow.com/questions/6500313/why-should-new-be-used-as-little-as-possible constructor. Consider the following program int main Line l1 Line l2 l1 Using the original version this program will likely.. Consider the following program int main Line l1 Line l2 l1 Using the original version this program will likely crash as..
best way to do variant visitation with lambdas http://stackoverflow.com/questions/7867555/best-way-to-do-variant-visitation-with-lambdas typedef ReturnType ReturnType_t lambda_visitor Lambda1 l1 Lambdas... lambdas Lambda1 l1 lambda_visitor ReturnType Lambdas..... lambda_visitor Lambda1 l1 Lambdas... lambdas Lambda1 l1 lambda_visitor ReturnType Lambdas... lambdas... lambda_visitor.. ReturnType Lambdas... lambdas... lambda_visitor Lambda1 l1 Lambdas ... lambdas Lambda1 l1 lambda_visitor ReturnType Lambdas.....
using declaration in variadic template http://stackoverflow.com/questions/7870498/using-declaration-in-variadic-template ReturnType Lambdas... operator lambda_visitor Lambda1 l1 Lambdas... lambdas Lambda1 l1 lambda_visitor ReturnType Lambdas..... lambda_visitor Lambda1 l1 Lambdas... lambdas Lambda1 l1 lambda_visitor ReturnType Lambdas... lambdas... template typename.. Lambda1 using Lambda1 operator lambda_visitor Lambda1 l1 boost static_visitor ReturnType Lambda1 l1 template typename..
C++ Tips for code optimization on ARM devices http://stackoverflow.com/questions/10800372/c-tips-for-code-optimization-on-arm-devices bits together and write them as DWORDS. 4 Be aware of your L1 L2 cache size. As a general rule ARM chips have much smaller..
C++ string comparison in one clock cycle http://stackoverflow.com/questions/1128096/c-string-comparison-in-one-clock-cycle damage your time because you'll be going out to L1 cache at best which adds some 10x time slowdown . If you are.. starting place. Loosely speaking if a cycle takes 1 unit a L1 hit takes 10 units an L2 hit takes 100 units and an actual RAM..
Structure of arrays and array of structures - performance difference http://stackoverflow.com/questions/11616941/structure-of-arrays-and-array-of-structures-performance-difference for both approach. Size of a Unit object is 48 bytes. L1 cache is 256K L2 is 1MB and L3 is 8MB. What am i missing here..
Massive CPU load using std::lock (c++11) http://stackoverflow.com/questions/13667810/massive-cpu-load-using-stdlock-c11 instead where that is defined with template class L0 class L1 void lock L0 l0 L1 l1 while true std unique_lock L0 u0 l0.. is defined with template class L0 class L1 void lock L0 l0 L1 l1 while true std unique_lock L0 u0 l0 if l1.try_lock u0.release.. u0.release break std this_thread yield std unique_lock L1 u1 l1 if l0.try_lock u1.release break std this_thread yield..
What is “cache-friendly” code? http://stackoverflow.com/questions/16699247/what-is-cache-friendly-code typically several levels of cache within the CPU chip L1 L2 L3 instruction caches ... RAM HDDs armed with their own caches..
Is it possible to use the hardware de-multiplexing for highload network servers? http://stackoverflow.com/questions/18408363/is-it-possible-to-use-the-hardware-de-multiplexing-for-highload-network-servers cores and it can take time to cache synchronization L1 CoreX L3 L1 CoreY for cache coherency http www.alexonlinux.com.. and it can take time to cache synchronization L1 CoreX L3 L1 CoreY for cache coherency http www.alexonlinux.com why interrupt..
C++ performance of accessing member variables versus local variables http://stackoverflow.com/questions/238535/c-performance-of-accessing-member-variables-versus-local-variables to win big time. Top of stack is virtually always in the L1 cache so the load takes one cycle. The object is more likely.. you have thousands of accesses the object data will be in L1 cache too. In summary the gain is so small that it virtually..
http://stackoverflow.com/questions/4573952/template-class-c the friend or the L of the class. So write template class L1 friend ostream operator ostream os const LinkedList L1 listToprint..
Can I force cache coherency on a multicore x86 CPU? http://stackoverflow.com/questions/558848/can-i-force-cache-coherency-on-a-multicore-x86-cpu . This tells the processor to bring the value to L1 cache without polluting L2. I suspect that X86 cores automatically..
Cross-platform way to get line number of an INI file where given option was found http://stackoverflow.com/questions/8358975/cross-platform-way-to-get-line-number-of-an-ini-file-where-given-option-was-foun 12 Demo Output POSITIONINFO 1 Parse success L 1 C2 .. L1 C6 Cat1 L 2 C2 .. L2 C7 name1 L 2 C8 .. L2 C12 100 L 6 C2 .... C2 .. L7 C7 name3 L 7 C11 .. L7 C22 dhfj dhjgfd L 13 C3 .. L13 C8 Cat_2 L 16 C2 .. L16 C8 Offset L 16 C9 .. L16 C15 0x1204.. .. L7 C22 dhfj dhjgfd L 13 C3 .. L13 C8 Cat_2 L 16 C2 .. L16 C8 Offset L 16 C9 .. L16 C15 0x1204 L 15 C2 .. L15 C7 Usage..
Why is one loop so much slower than two loops? http://stackoverflow.com/questions/8547778/why-is-one-loop-so-much-slower-than-two-loops same cache way. However Intel processors have had 8 way L1 cache associativity for a while. But in reality the performance.. Core 2. Region 3 At this point the data no longer fits in L1 cache. So performance is capped by the L1 L2 cache bandwidth... longer fits in L1 cache. So performance is capped by the L1 L2 cache bandwidth. Region 4 The performance drop in the single..
Modern OpenGL: VBO, GLM and Matrix Stacks http://stackoverflow.com/questions/8951509/modern-opengl-vbo-glm-and-matrix-stacks has a negative impact on performance code size creates L1 cache pressure . QUESTION How we do hierarchical transformations..
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