I wrote: Let's say we focus on the echo | cut slowness I mentioned earlier. This is independent of the CWD and doesn't cause the explorer.exe spike but is still 200 times slower on my Vista laptop than on a low-powered Linux server. If we correct this problem, I'm pretty confident the time per loop will go way down.
I've also confirmed these results on my work PC. It's much faster than my laptop (120 ms vs 800 ms) but it's still much slower than the 2-6 ms I get on the server. ----- For this test, rather than using cut I decided to use wc -l, it's a little simpler. When I run: echo hi | strace wc -l I get this trace, with one line in particular that seems to have taken a very long time, near the bottom. 12 12 [main] wc 2332 open_shared: name shared.5, n 5, shared 0x60FC0000 (wanted 0x60FC0000), h 0xC4 156 168 [main] wc 2332 heap_init: heap base 0xDA0000, heap top 0xDA0000 91 259 [main] wc 2332 open_shared: name S-1-5-21-1723455903-1123245079-927917492-1000.1, n 1, shared 0x60FD0000 (wanted 0x60FD0000), h 0xCC 43 302 [main] wc 2332 user_shared_create: opening user shared for 'S-1-5-21-1723455903-1123245079-927917492-1000' at 0x60FD0000 40 342 [main] wc 2332 user_shared_create: user shared version 2E710001 57 399 [main] wc 2332 events_init: windows_system_directory 'C:\Windows\system32\', windows_system_directory_length 20 107 506 [main] wc 2332 dll_crt0_0: finished dll_crt0_0 initialization 128 634 [main] wc 2332 _cygtls::remove: wait 0xFFFFFFFF 56 690 [main] wc 2332 _cygtls::remove: removed 0x22CE64 element 0 77 767 [main] wc 2332 _cygtls::remove: wait 0xFFFFFFFF 34 801 [main] wc 2332 _cygtls::remove: removed 0x22CE64 element 0 164431 165232 [sig] wc 2332 wait_sig: entering ReadFile loop, my_readsig 0x2B0, my_sendsig 0x2B4 2729 167961 [main] wc 2332 _cygwin_istext_for_stdio: fd 0: not open 75 168036 [main] wc 2332 _cygwin_istext_for_stdio: fd 1: not open 35 168071 [main] wc 2332 _cygwin_istext_for_stdio: fd 2: not open ... rest omitted ... -- 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
