Daniel Stutzbach <daniel <at> stutzbachenterprises.com> writes: > > Do we really need priority requests at all? They seem counter to your > desire for simplicity and allowing the operating system's scheduler to do > its work.
No, they can be disabled (removed) if we prefer. With priority requests disabled, latency results becomes less excellent but still quite good. Running ccbench on a dual core machine gives the following latency results, first with then without priority requets. --- Latency --- (with prio requests) Background CPU task: Pi calculation (Python) CPU threads=0: 0 ms. (std dev: 0 ms.) CPU threads=1: 0 ms. (std dev: 2 ms.) CPU threads=2: 0 ms. (std dev: 2 ms.) CPU threads=3: 0 ms. (std dev: 2 ms.) CPU threads=4: 0 ms. (std dev: 2 ms.) Background CPU task: regular expression (C) CPU threads=0: 0 ms. (std dev: 0 ms.) CPU threads=1: 3 ms. (std dev: 2 ms.) CPU threads=2: 3 ms. (std dev: 2 ms.) CPU threads=3: 3 ms. (std dev: 2 ms.) CPU threads=4: 4 ms. (std dev: 3 ms.) Background CPU task: bz2 compression (C) CPU threads=0: 0 ms. (std dev: 2 ms.) CPU threads=1: 0 ms. (std dev: 2 ms.) CPU threads=2: 0 ms. (std dev: 0 ms.) CPU threads=3: 0 ms. (std dev: 2 ms.) CPU threads=4: 0 ms. (std dev: 1 ms.) --- Latency --- (without prio requests) Background CPU task: Pi calculation (Python) CPU threads=0: 0 ms. (std dev: 2 ms.) CPU threads=1: 5 ms. (std dev: 0 ms.) CPU threads=2: 3 ms. (std dev: 3 ms.) CPU threads=3: 9 ms. (std dev: 7 ms.) CPU threads=4: 22 ms. (std dev: 23 ms.) Background CPU task: regular expression (C) CPU threads=0: 0 ms. (std dev: 1 ms.) CPU threads=1: 8 ms. (std dev: 2 ms.) CPU threads=2: 5 ms. (std dev: 4 ms.) CPU threads=3: 21 ms. (std dev: 32 ms.) CPU threads=4: 19 ms. (std dev: 26 ms.) Background CPU task: bz2 compression (C) CPU threads=0: 0 ms. (std dev: 1 ms.) CPU threads=1: 0 ms. (std dev: 2 ms.) CPU threads=2: 0 ms. (std dev: 0 ms.) CPU threads=3: 0 ms. (std dev: 0 ms.) CPU threads=4: 0 ms. (std dev: 0 ms.) _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
