John Machin wrote: > Here are some data points that illustrate the improvement in speed > since 2.1 for one (probably atypical) application: rummaging through a > 120MB Microsoft Excel spreadsheet file using the xlrd package. > > The time shown is the number of seconds required to open the file and > parse out all data content -- heavy usage of struct.unpack(). The only > code that is conditional on the Python version is where it defines > things to stop 2.1 barfing, like a dummy class called "object" . > > 2.1.3: 117 > 2.2.3: 95 > 2.3.5: 75 > 2.4.3: 62 > 2.5c1: 49 > > Other info: > xlrd version: 0.6.0a2 -- coming soon to a cheese shop near you :-) > OS: Windows XP SP2 > CPU: > PROCESSOR_IDENTIFIER=x86 Family 15 Model 4 Stepping 1, GenuineIntel > HumanSpeak: Intel dual-core Pentium (R) 4, nominal speed is > 3.20Ghz > Memory: 1 Gb (enough to avoid swapping) > > Well done, core devs! > > FWIW, IronPython 1.0.60816 does it in 132 seconds. For avoidance of > doubt (and flak!) I'd like to clarify that IMHO the mere existence of > IronPython merits plaudits. I do however trust that it will similarly > become faster over time. And nobody mentioned the possibility of an > 188% increase in memory usage, which may well be partially explained by > this: > > DOS prompt>\ironpython\ipy > IronPython 1.0.60816 on .NET 2.0.50727.42 > Copyright (c) Microsoft Corporation. All rights reserved. > >>> str is unicode > True
This might also explain in part the relative slowness you noticed. OTOH, IronPython on Mono is around 20% faster than cPython 2.4 and 2.5c1 running pystone on my laptop (~50K pystones/sec for IronPython, ~41K pystones/sec for cPython; not significant difference between 2.4 and 2.5c1). Just adding a datapoint from a completely different environment: CPU: Pentium-M 730 (1.6GHz) Memory: 512 MB OS: Ubuntu Dapper (6.06 LTS Dapper Drake) Python2.4: 2.4.3 (#2, Apr 27 2006, 14:43:58) [GCC 4.0.3 (Ubuntu 4.0.3-1ubuntu5)] Python2.5: 2.5c1 (r25c1:51305, Aug 18 2006, 19:18:03) [GCC 4.0.3 (Ubuntu 4.0.3-1ubuntu5)] IronPython: 1.0.2444 on .NET 2.0.50727.42 Mono JIT compiler version 1.1.17 TLS: normal GC: Included Boehm (with typed GC) SIGSEGV: normal Disabled: none George -- http://mail.python.org/mailman/listinfo/python-list