Mail Archives: cygwin/2000/09/26/16:01:09
I haven't had this problem in my makefiles, but yesterday I happened to be
trying out a makefile that someone else sent me, and I experienced a *huge*
delay. I haven't tried to analyze it, but I did observe this. When the VPATH
is set to any of the following (which, by the way, don't work correctly in
the test makefile)
VPATH = c:/temp/test/source
VPATH = /cygdrive/c/temp/test/source
VPATH = //c/temp/test/source
There is no long delay. When VPATH is set to this (which is incorrect)
VPATH = //cygdrive/c/temp/test/source
and I do
make -d
make spits out
-----------------------------------
GNU Make version 3.79, by Richard Stallman and Roland McGrath.
Built for i686-pc-cygwin
Copyright (C) 1988, 89, 90, 91, 92, 93, 94, 95, 96, 97, 98, 99
Free Software Foundation, Inc.
This is free software; see the source for copying conditions.
There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A
PARTICULAR PURPOSE.
Report bugs to <bug-make AT gnu DOT org>.
Reading makefiles...
Reading makefile `makefile'...
-----------------------------------
and then stalls for about 7 seconds before continuing. I have no idea if you
have a bad VPATH in your makefiles, but this example illustrates that some
errors can cause large delays, and yet otherwise not be reported as errors.
I don't know if any of the following suggestions will appreciably speed up
processing, but I know they relieve make of having to examine a lot of
dead-end possibilities. [NOTE that these may not be desirable/usable in all
circumstances.]
1) Use .PHONY: for all targets that don't correspond to real files.
2) Use .SUFFIXES:#blank to delete all known default suffixes.
3) Add an empty rule (no dependencies, no commands) for "makefile" and any
files it includes.
Good luck
Scott Carter
Software Engineer
-----Original Message-----
From: Gabriel Zachmann [mailto:zach AT igd DOT fhg DOT de]
Sent: Monday, September 25, 2000 03:49 AM
To: cygwin AT sources DOT redhat DOT com
Subject: Re: gmake is slow under cygwin
] --- Gabriel Zachmann <zach AT igd DOT fhg DOT de> wrote:
] >
] > Any ideas or insights will be highly appreciated,
] > Gab.
] >
]
] Any virus scanners running? See the FAQ.
]
(Hm, the FAQ didn't say that a virus scanner could incur a performance
penalty, it just said that it might prevent cygwin from functioning ;-)
Ok, I switched McAffee off.
But that reduced execution time only by about 1 sec:
- with mcaffee running: real time = 7.4 sec, user time = 3.1 sec;
- mcaffee not running: real = 6 sec, user time = 2.8 sec
That still seems pretty slow for just a few 100 lines of makefiles,
doesn't it?
Cheers,
Gab.
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