--- Gio 30/9/10, SZABÓ Gergely ha scritto: > Hello, > > we have a Cygwin-based build system for an embedded > project. > Build performance has deteriorated terribly since we > upgraded to 1.7.x from 1.5.25. > > I've created 3 shell-scripts to benchmark 1.5.25 and 1.7.7 > against each other. > - null : read file "inp" line by line, write > to /dev/null. > - builtin : write each line to file "out", only > bash-builtins used (no fork) > - fork : do some substitution for each line > with sed (huge number of forks) > > Results: > - null : 1.7.7 is about 5 times faster > - builtin : 1.7.7 is slightly faster > - fork : 1.7.7 is 5 times SLOWER !!! > > All measurements were made with the "time" command. > The attached results.txt lists the "real" times. > > I've also attached the 3 shell-scripts (null, builtin, > fork). > Input file "inp" is also attached. > > Also see the cygcheck_xxx.out files for both Cygwin > versions. > > Some notes: > both cygwin versions use the same /home, mounted from > "D:\Documents and Settings",
I bet is a network/acl issues. I suggest to create a real home on "/home" > so all user-level config-files are shared between the > Cygwin versions. > > Cygwin 1.7.7 is basically unusable at the moment. > Any ideas why it's so much slower at spawning processes? Or > is it the pipes? Am I doing something wrong? > > And more importantly: is there an easy way to fix this? > > Thanks in advance for any help! > > Best regards > Gergely Szabó > testing on /tmp/benchmark with XPS P2 cygwin 1.7.8s 20100924 $ time ./fork real 1m12.856s user 0m52.480s sys 1m6.423s cygwin 1.5.25-15 $ time ./fork real 1m7.969s user 0m52.992s sys 1m11.583s So no difference Marco -- Problem reports: http://cygwin.com/problems.html FAQ: http://cygwin.com/faq/ Documentation: http://cygwin.com/docs.html Unsubscribe info: http://cygwin.com/ml/#unsubscribe-simple