cygwin vfork
Christopher Faylor
cgf@redhat.com
Sun Nov 11 08:26:00 GMT 2001
On Mon, Nov 12, 2001 at 01:45:01PM -0500, Charles Wilson wrote:
>Seen on the XEmacs list:
>
>> In general the cygwin build is slower, I think this is for 3 main
>> reasons:
>>
>> 1) gcc optimization is not as good as MSVC
>> 2) The cygwin portability layer adds a lot of overhead especially
>> wrt file handling.
>> 3) The cygwin implementation of fork-and-exec doesn't jive well with
>> the VM size of xemacs. Supposedly a real vfork is in the works for
>> cygwin but I can't attest to its functionality.
>
>Does #3 make any sense? I thought we *had* a real vfork...perhaps it
>doesn't work well with large apps? Or is the author just blowing smoke?
We have had a sort-of-vfork that should be faster than fork since 1.3.3,
I think. No idea what the VM goobledy-gook is referring to.
Cygwin's vfork is just black magic that eventually results in running
spawn(P_NOWAIT) rather than fork/exec.
cgf
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