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Re: fork performance
Corinna Vinschen wrote:
On May 19 06:47, Reinhard Nissl wrote:
Hi,
running the following command sequence in bash yields little numbers
compared to a real unix system:
while true ; do date ; done | uniq -c
15 Thu May 15 10:40:22 2008
16 Thu May 15 10:40:23 2008
17 Thu May 15 10:40:24 2008
17 Thu May 15 10:40:25 2008
17 Thu May 15 10:40:26 2008
16 Thu May 15 10:40:27 2008
17 Thu May 15 10:40:28 2008
16 Thu May 15 10:40:29 2008
Is there a chance to speedup performance?
Cygwin's fork() implementation is *not* deliberately slow. Take a look
into the sources, file fork.cc, and see what it has to do. Having said
that, of course http://cygwin.com/acronyms/#PTC
BTW: Even Linux fork() is only fast if it has access to real memory
management hardware. In a VM, considerable slowdown occurs.
Average "date per second" results from above command on same machine:
Linux native: 780
Linux VMware: 255
Linux VirtualBox: 145
Linux VirtualPC: 60
Cygwin: 56 (AV off, Kerio Fw off)
Cygwin: 48 (AV on, Kerio Fw off)
Cygwin: 25 (AV off, Kerio Fw on)
Christian
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