Hi,
Attached is a patch that sets the maxmem options at startup on Windows
OSes based on reported memory availability. It uses a simple heuristic
to derive a value to use. The checks for limited memory systems from
the dark ages of last century may not be ideal, if anyone is still
nursing such a system it would be nice to try the patch on it to see if
the reserve numbers need to be tweaked.
HTH - TTFN
Mike
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OPTIMISM - an optimist is someone who tells you to cheer up when things
are going his way.
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diff --git a/src/os_win32.c b/src/os_win32.c
--- a/src/os_win32.c
+++ b/src/os_win32.c
@@ -5858,6 +5858,61 @@ mch_breakcheck(void)
#endif
}
+/* Physical RAM to leave for the OS */
+#define WINNT_RESERVE_BYTES (256*1024*1024)
+#define WIN95_RESERVE_BYTES (8*1024*1024)
+
+/*
+ * How much main memory in KiB that can be used by VIM.
+ */
+/*ARGSUSED*/
+ long_u
+mch_total_mem(int special)
+{
+#ifdef MEMORYSTATUSEX
+ PlatformId();
+ if (g_PlatformId == VER_PLATFORM_WIN32_NT)
+ {
+ MEMORYSTATUSEX ms;
+
+ /* Need to use GlobalMemoryStatusEx() when there is more memory than
+ * what fits in 32 bits. But it's not always available. */
+ ms.dwLength = sizeof(MEMORYSTATUSEX);
+ GlobalMemoryStatusEx(&ms);
+ if (ms.ullAvailVirtual < ms.ullTotalPhys)
+ {
+ /* Process address space fits in physical RAM, use all of it */
+ return (long_u)(ms.ullAvailVirtual/1024);
+ }
+ if (ms.ullTotalPhys < WINNT_RESERVE_BYTES)
+ {
+ /* Catch old NT box or perverse hardware setup */
+ return (long_u)((ms.ullTotalPhys/2)/1024);
+ }
+ /* Use physical RAM less reserve for OS + data */
+ return (long_u)((ms.ullTotalPhys - WINNT_RESERVE_BYTES)/1024);
+ }
+ else
+#endif
+ {
+ MEMORYSTATUS ms;
+
+ ms.dwLength = sizeof(MEMORYSTATUS);
+ GlobalMemoryStatus(&ms);
+ if (ms.dwAvailVirtual < ms.dwTotalPhys)
+ {
+ /* Process address space fits in physical RAM, use all of it */
+ return (long_u)(ms.dwAvailVirtual/1024);
+ }
+ if (ms.dwTotalPhys < WIN95_RESERVE_BYTES)
+ {
+ /* Catch old 95 box or perverse hardware setup */
+ return (long_u)((ms.dwTotalPhys/2)/1024);
+ }
+ /* Use physical RAM less reserve for OS + data */
+ return (long_u)((ms.dwTotalPhys - WIN95_RESERVE_BYTES)/1024);
+ }
+}
#ifdef FEAT_MBYTE
/*
diff --git a/src/os_win32.h b/src/os_win32.h
--- a/src/os_win32.h
+++ b/src/os_win32.h
@@ -78,6 +78,8 @@
# define BREAKCHECK_SKIP 1 /* call mch_breakcheck() each time, it's fast */
#endif
+#define HAVE_TOTAL_MEM
+
#define HAVE_PUTENV /* at least Bcc 5.2 and MSC have it */
#ifdef FEAT_GUI_W32
diff --git a/src/proto/os_win32.pro b/src/proto/os_win32.pro
--- a/src/proto/os_win32.pro
+++ b/src/proto/os_win32.pro
@@ -43,6 +43,7 @@ void mch_write __ARGS((char_u *s, int le
void mch_delay __ARGS((long msec, int ignoreinput));
int mch_remove __ARGS((char_u *name));
void mch_breakcheck __ARGS((void));
+long_u mch_total_mem __ARGS((int special));
int mch_wrename __ARGS((WCHAR *wold, WCHAR *wnew));
int mch_rename __ARGS((const char *pszOldFile, const char *pszNewFile));
char *default_shell __ARGS((void));
