Sturla Molden skrev:
does not crash the interpreter, but it seems it can deadlock.
Here is what I get con a quadcore (Vista, Python 2.6.3).
This what I get with affinity set to CPU 3.
There are deadlocks happening at random locations in ccbench.py. It gets
worse with affinity set to one processor.
Sturla
D:\>start /AFFINITY 3 /B ccbench.py
D:\>--- Throughput ---
Pi calculation (Python)
threads=1: 554 iterations/s.
threads=2: 257 ( 46 %)
threads=3: 272 ( 49 %)
threads=4: 280 ( 50 %)
regular expression (C)
threads=1: 501 iterations/s.
threads=2: 505 ( 100 %)
threads=3: 493 ( 98 %)
threads=4: 507 ( 101 %)
bz2 compression (C)
threads=1: 455 iterations/s.
threads=2: 889 ( 195 %)
threads=3: 1309 ( 287 %)
threads=4: 1710 ( 375 %)
--- Latency ---
Background CPU task: Pi calculation (Python)
CPU threads=0: 0 ms. (std dev: 0 ms.)
CPU threads=1: 0 ms. (std dev: 0 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.)
Background CPU task: regular expression (C)
CPU threads=0: 0 ms. (std dev: 0 ms.)
CPU threads=1: 40 ms. (std dev: 22 ms.)
CPU threads=2: 384 ms. (std dev: 179 ms.)
CPU threads=3: 618 ms. (std dev: 314 ms.)
CPU threads=4: 713 ms. (std dev: 379 ms.)
Background CPU task: bz2 compression (C)
CPU threads=0: 0 ms. (std dev: 0 ms.)
CPU threads=1: 0 ms. (std dev: 0 ms.)
CPU threads=2: 0 ms. (std dev: 0 ms.)
CPU threads=3: 0 ms. (std dev: 3 ms.)
CPU threads=4: 0 ms. (std dev: 1 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
