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Simple tasks on python algorithms to warm up. Some classics.
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Gaussian-Seidel method to solve a system of linear equations. [Innopolis University] Linear Algebra 2023
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Show utilization of RAM memory on macOS using vm_stat and top
To inspect RAM memory on macOS there are alternatives to vmstat or free on Linux: vm_stat and top (actually it's exists on both systems).
To check free RAM on macOS: $> top -l 1 -s 0 | grep PhysMem It will show you occupied physical memory and available once.
Either you can run this: $> vm_stat | perl -ne '/page size of (\d+)/ and $size=$1; /Pages\s+([^:]+)[^\d]+(\d+)/ and printf("%-16s % 16.2f Mi\n", "$1:", $2 * $size / 1048576);' It will show information in pages by default, but perl script provide output in human readable format.
Solution of psql: FATAL: Peer authentication failed for user “postgres” (or any user)
psql: FATAL: Peer authentication failed for user “postgres” (or any user)
The connection failed because by default psql connects over UNIX sockets using peer authentication, that requires the current UNIX user to have the same user name as psql. So you will have to create the UNIX user postgres and then login as postgres or use sudo -u postgres psql database-name for accessing the database (and psql should not ask for a password).
If you cannot or do not want to create the UNIX user, like if you just want to connect to your database for ad hoc queries, forcing a socket connection using psql --host=localhost --dbname=database-name --username=postgres (as pointed out by @meyerson answer) will solve your immediate problem.
But if you intend to force password authentication over Unix sockets instead of the peer method, try changing the following pg_hba.conf* line:
The value of this variable describes what color to use for which attribute when colors are enabled with CLICOLOR. This string is a concatenation of pairs of
the format fb, where f is the foreground color and b is the background color.