Can we see the simple program?
Alexander On Wed, 21 Mar 2007, allen mathias wrote:
Hi, I am attempting to understand why my Solaris with a UFS filesystem is taking an extrodinarilary larger time to read files from disk using a simple c++ program as compared to a linux system. The program is simple C++ code that uses fstreams to read a million lines and write them to a file as soon as the line is read. Compilation done with default options and 64bit binaries generated. These are the 'time' outputs 1. Solaris snv56 + CC compilation real 0m9.486s user 0m4.610s sys 0m4.873s 2. Solaris snv56 + g++ compilation real 0m5.490s user 0m1.703s sys 0m3.782s 3. Linux 2.6 kernel + g++ compilation real 0m5.349s user 0m0.672s sys 0m4.668s Also I notice that if instead of using fstreams I use cin and 'cat' the file into my test program the time values are in favor of the Solaris system. ufs logging is set on all disks. Can anyone shed some light on this. Thanks -Allen This message posted from opensolaris.org _______________________________________________ perf-discuss mailing list perf-discuss@opensolaris.org
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