Simple table size estimates and 128-bit numbers (Java Edition)
17 November 2018 | 2:42 am

Suppose that you are given a table. You know the number of rows, as well as how many distinct value each column has. For example, you know that there are two genders (in this particular table). Maybe there are 73 distinct age values. For a concrete example, take the standard Adult data set which is … Continue reading Simple table size estimates and 128-bit numbers (Java Edition)

Memory-level parallelism: Intel Skylake versus Apple A12/A12X
13 November 2018 | 4:18 pm

Modern processors execute instructions in parallel in many different ways: multi-core parallelism is just one of them. In particular, processor cores can have several outstanding memory access requests “in flight”. This is often described as “memory-level parallelism”. You can measure the level of memory-level parallelism your processors has by traversing an array randomly either by … Continue reading Memory-level parallelism: Intel Skylake versus Apple A12/A12X

Science and Technology links (November 10th, 2018)
10 November 2018 | 3:42 pm

It already takes more energy to operate Bitcoin than to mine actual gold. Cryptocurrencies are responsible for millions of tons of CO2 emissions. (Source: Nature) “Half of countries have fertility rates below the replacement level, so if nothing happens the populations will decline in those countries” (source:BBC) According to Dickenson et al., 8.6% of us … Continue reading Science and Technology links (November 10th, 2018)


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