On Wed, 2011-04-06 at 12:35 +0100, Michael Meeks wrote:
> Anyhow - one problem we are seeing is that as we load and parse the
> ~50Mb of dependencies that we need (for part of writer) we are statting
> the same files involved in dependencies sometimes a thousand times or
> so. We do around 700k stats with lots of duplication.
>
> These ~all come from calling 'glob'; I append a patch that tries to
> call glob only if needed - it could be done more prettily:
Try this one and see if it works as well.
--
-------------------------------------------------------------------------------
Paul D. Smith <[email protected]> Find some GNU make tips at:
http://www.gnu.org http://make.mad-scientist.net
"Please remain calm...I may be mad, but I am a professional." --Mad Scientist
? gnumake.supp
? log.1
? vg.out
? x.out
? doc/gendocs_template
? doc/manual
Index: read.c
===================================================================
RCS file: /sources/make/make/read.c,v
retrieving revision 1.197
diff -u -r1.197 read.c
--- read.c 18 Apr 2011 01:25:20 -0000 1.197
+++ read.c 18 Apr 2011 01:59:14 -0000
@@ -2898,6 +2898,7 @@
const char *name;
const char **nlist = 0;
char *tildep = 0;
+ int globme = 1;
#ifndef NO_ARCHIVES
char *arname = 0;
char *memname = 0;
@@ -3106,32 +3107,40 @@
}
#endif /* !NO_ARCHIVES */
- switch (glob (name, GLOB_NOSORT|GLOB_ALTDIRFUNC, NULL, &gl))
- {
- case GLOB_NOSPACE:
- fatal (NILF, _("virtual memory exhausted"));
-
- case 0:
- /* Success. */
- i = gl.gl_pathc;
- nlist = (const char **)gl.gl_pathv;
- break;
-
- case GLOB_NOMATCH:
- /* If we want only existing items, skip this one. */
- if (flags & PARSEFS_EXISTS)
- {
- i = 0;
- break;
- }
- /* FALLTHROUGH */
-
- default:
- /* By default keep this name. */
+ /* glob() is expensive: don't call it unless we need to. */
+ if (!(flags & PARSEFS_EXISTS) || strpbrk (name, "?*[") == NULL)
+ {
+ globme = 0;
i = 1;
nlist = &name;
- break;
- }
+ }
+ else
+ switch (glob (name, GLOB_NOSORT|GLOB_ALTDIRFUNC, NULL, &gl))
+ {
+ case GLOB_NOSPACE:
+ fatal (NILF, _("virtual memory exhausted"));
+
+ case 0:
+ /* Success. */
+ i = gl.gl_pathc;
+ nlist = (const char **)gl.gl_pathv;
+ break;
+
+ case GLOB_NOMATCH:
+ /* If we want only existing items, skip this one. */
+ if (flags & PARSEFS_EXISTS)
+ {
+ i = 0;
+ break;
+ }
+ /* FALLTHROUGH */
+
+ default:
+ /* By default keep this name. */
+ i = 1;
+ nlist = &name;
+ break;
+ }
/* For each matched element, add it to the list. */
while (i-- > 0)
@@ -3171,7 +3180,8 @@
#endif /* !NO_ARCHIVES */
NEWELT (concat (2, prefix, nlist[i]));
- globfree (&gl);
+ if (globme)
+ globfree (&gl);
#ifndef NO_ARCHIVES
if (arname)
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