Common LISP stdin reading performance degradation

“Why does my C++ N-body simulation have a pulsating performance slowdown? I've been developing a 2D N-body gravity simulation in C++, and I've run into an interesting performance issue. Instead of a stable frame rate, the application's update time systematically pulsates between a "fast state" and a "slow state." The simulation calculates gravitational forces for 5,184 bodies. The issue occurs with [code] and, surprisingly, also with [code] . The Performance Problem The core issue is a cyclical s”

“Performance issues with reading lines from *standard-input* I need to process 100 Gigabytes of logs in a weird format, then do some analysis on the results. Initial parts of parsing and CLI done, tried on some test data with 1 GB and it took around a minute. I ran a sanity check that just copied [code] to [code] , and it showed that most of the time is spent in the reading part. Python did the same thing in a couple of seconds, if even. To generate sample data: [code] Common LISP code: [code] Py”

“Why is AnyEvent slowing down or leaking memory? While writing a new Perl module which was capable of using AnyEvent, my benchmarking tests showed that it was slowing down dramatically over time. Turning off AnyEvent cured the problem, which isolated the offending code to the following section. [code] The behaviour looked like a leak, but adding explicit undefs for all the variables after the [code] did not help. The "if" condition associated with the timer was false, so this is between the CV an”