GPU Performance Analysis and Optimization - GPU Technology ...

Pattern Category 4: Irregular Address• Cause:– Threads in a warp access many lines, strides are irregular• Issues:– Wasted bandwidth: not all the bytes in the lines are used by application– Increased latency: if N transactions are needed per instruction,instruction is issued N timesaddresses from a warp...• Symptoms:– Transactions per request much higher than ideal– Low to none L1 hits• Remedies:– Partial: non-caching loads, read-only loads© 2012, NVIDIA70