Emacs can't start-process more than 30~40 processes

Wed Jul 29 10:27:00 GMT 2009

Dave Korn <dave.korn.cygwin@googlemail.com> writes:
> Haojun Bao wrote:
>>>>> My question is, is there anyway out of this? Can I just rebase
>> cygwin1.dll to the end of all other DLLs? 
>> It ought to work. Would you mind giving it a try and letting us know if it
> helps? It might be a good idea to tweak rebaseall to do this for us.
>Yes, it helped, the max start-process number is improved from ~30 to
~37. I think it's hit another issue.
Here's the details: 
I can't run rebase.exe on cygwin1.dll directly, since the latter is
loaded by the former. I wrote a .bat file to rebase it:
 cd c:\cygwin\bin
 c:
 copy cygwin1.dll 2.dll
 rebase -b 0x45000000 2.dll
 copy 2.dll cygwin1.dll
I did not try to rebase cygwin1.dll to the end of all other DLLs though,
I don't know if that is feasible. Instead, I just make it a lot more far
away from the DLL that's next to it in the address space.
(The old base for cygwin1 is 0x61000000, and next is cygncurses-9.dll
based at 0x61650000, the max cygheap is ~6.6M; new cygwin1 base is
0x45000000, and the next DLL is cygz.dll, with a base 0x54950000, with a
max cygheap ~256M).
After this, the emacs can start more processes, but still not unlimited,
neither will it segfault; it just exits will code 255 after printing
"Wrong type argument: stringp, 0". This must be another issue now, I
will debug it when I have more time.
 $/bin/emacs --batch -q --execute '(let ((num 0))
 (while (< num 80)
 (setq num (+ num 1))
 (message "num is %d" num)
 (start-process "hello" nil "/usr/bin/echo")))'
 ---------------- output ----------------
 ...
 ...
 num is 37
 Wrong type argument: stringp, 0
 
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