Articles in the permanent category
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Recursive queries in PostgreSQL
For some data relationships in Postgres (or any other relational database that speaks SQL), recursive queries are near inevitable. Let's say you have some top-level …
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Mean Absolute Error
Mean Absolute Error (MAE) is a metric for assessing regression predictions. Simply take the average of the absolute error between all labels and predictions in …
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Root Mean-Squared Error
Root mean-squared error (RMSE) is a function for assessing regression predictions.
Sometimes called L2 Loss because it takes the L2 Norm of the error vector …
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fork System Call
When a process spawns a separate process to handle some work, it invokes the
fork(2)system call.fork(2)duplicates the current process in … -
Orphan Processes
When a parent process finishes executing before its children, the child processes are said to become orphan processes.
When this happens, the init process - the …
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Zombie Processes
Zombie processes are "dead" processes. That is, processes that have finished executing and are waiting for the parent to reap them (collect information about their …
