Antoine Pitrou skrev:
(*) http://svn.python.org/view/sandbox/trunk/ccbench/
I´ve run it twice on my dual core machine. It hangs every time, but not in the
same place:
D:\pydev\python\trunk\PCbuild>python.exe \tmp\ccbench.py
Ah, you should report a bug then. ccbench is pure Python (and not
particularly evil Python), it shouldn't be able to crash the
interpreter.
It does not crash the interpreter, but it seems it can deadlock.
Here is what I get con a quadcore (Vista, Python 2.6.3).
D:\>ccbench.py
--- Throughput ---
Pi calculation (Python)
threads=1: 568 iterations/s.
threads=2: 253 ( 44 %)
threads=3: 274 ( 48 %)
threads=4: 283 ( 49 %)
regular expression (C)
threads=1: 510 iterations/s.
threads=2: 508 ( 99 %)
threads=3: 503 ( 98 %)
threads=4: 502 ( 98 %)
bz2 compression (C)
threads=1: 456 iterations/s.
threads=2: 892 ( 195 %)
threads=3: 1320 ( 289 %)
threads=4: 1743 ( 382 %)
--- 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: 37 ms. (std dev: 21 ms.)
CPU threads=2: 379 ms. (std dev: 175 ms.)
CPU threads=3: 625 ms. (std dev: 310 ms.)
CPU threads=4: 718 ms. (std dev: 381 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: 0 ms.)
CPU threads=4: 1 ms. (std dev: 3 ms.)
D:\>ccbench.py
--- Throughput ---
Pi calculation (Python)
threads=1: 554 iterations/s.
threads=2: 400 ( 72 %)
threads=3: 273 ( 49 %)
threads=4: 231 ( 41 %)
regular expression (C)
threads=1: 508 iterations/s.
threads=2: 509 ( 100 %)
threads=3: 509 ( 100 %)
threads=4: 509 ( 100 %)
bz2 compression (C)
threads=1: 456 iterations/s.
threads=2: 897 ( 196 %)
threads=3: 1316 ( 288 %)
DEADLOCK
D:\>ccbench.py
--- Throughput ---
Pi calculation (Python)
threads=1: 559 iterations/s.
threads=2: 397 ( 71 %)
threads=3: 274 ( 49 %)
threads=4: 238 ( 42 %)
regular expression (C)
threads=1: 507 iterations/s.
threads=2: 499 ( 98 %)
threads=3: 505 ( 99 %)
threads=4: 495 ( 97 %)
bz2 compression (C)
threads=1: 455 iterations/s.
threads=2: 896 ( 196 %)
threads=3: 1320 ( 290 %)
threads=4: 1736 ( 381 %)
--- 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: 34 ms. (std dev: 21 ms.)
CPU threads=2: 358 ms. (std dev: 174 ms.)
CPU threads=3: 619 ms. (std dev: 312 ms.)
CPU threads=4: 742 ms. (std dev: 382 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: 0 ms.)
CPU threads=4: 6 ms. (std dev: 13 ms.)
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