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Sorry for my previous mail. I did not read the gudelines before I sent it (it was my first email to this list). Here is my previous email: I am not sure if you are aware of this, but the recent upgrade of the Cygwin DLL (to version 1.3.11-3) caused a dramatic (3 to 7 fold) slowdown of gcc compiled code. The code is a preprocessor of large text files. It essentially reads a file (up to 1,500,000 lines) and writes a reformatted file (essentially the same number of lines). It seems like the slowdown occurs during file IO. I am noticing 3-fold decrease on reads and 7-fold decrease on writes. I routinely use the setup utility to keep my Cygwin environment up to date. Is it safe to downgrade the cygwin module to 1.3.10 (I just downloaded the cygwin-1.3.10-1.tar.bz2). I investigated the problem a little further and the results are even more dramatic. I am almost sure that the problem is in cygwin1.dll. Here is what I did: (1) I timed my code with 1.3.11-3 DLL - the results are: 80s the reading part and 140s the writing part for the total of 220s. (2) I replaced the cygwin1.dll ONLY with 1.3.10-1. I re-ran the executable without touching anything else! The results: 7s reading 6s writing for a total of 13s. The difference is almost 17-fold! I am running Cygwin environment on a IBM Intellistation with Windows 2000 Professional (SP 2). I attaching the output of cygcheck -s -v -r. I hope that attachments can be handled by the discussion list server. Andy (See attached file: ccc.txt) __________________________________ Andy Jaworski Engineering Systems Technology Center 3M Center, 518-1-01 St. Paul, MN 55144-1000 ----- E-mail: apjaworski@mmm.com Tel: (651) 733-6092 Fax: (651) 736-3122
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