perl -Mthreads -e'$n=3;for (1..$n){$t[$_]=threads->create(sub{my $r; while(1){$r++}});}; sleep 10;threads->exit()'

FWIW, I can attest that setting n=2 pegs both cores on my amd 3800+ running Arch Linux. However, n=1 (recommended setting) only pegs one core.

In reply to Re^3: Standard way to convert timezone in multithreaded script by rowdog
in thread Standard way to convert timezone in multithreaded script by whale2

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